The Ecere SDK - sdk/blob - ecere/src/gfx/3D/Object.ec

   1 namespace gfx3D;
   2
   3 import "Display"
   4
   5 public enum FrustumPlacement { outside, inside, intersecting };
   6
   7 public class ObjectFormat
   8 {
   9    class_data const char * extension;
  10    class_property const char * extension
  11    {
  12       set { class_data(extension) = value; }
  13       get { return class_data(extension); }
  14    }
  15
  16    virtual bool ::Load(Object object, const char * fileName, DisplaySystem displaySystem);
  17 };
  18
  19 // TODO: Review these:
  20 public class ObjectFlags
  21 {
  22 public:
  23    bool root:1, viewSpace:1, ownMesh:1, translucent:1, flipWindings:1, keysLoaded:1, transform:1, mesh:1, light:1, camera:1, localMatrixSet:1;
  24    int hierarchy:16:16;
  25 };
  26
  27 public struct Transform
  28 {
  29    Vector3D position;
  30    Quaternion orientation;
  31    Vector3Df scaling;
  32 };
  33
  34 /*static float ease(float t, float a, float b)
  35 {
  36    float k;
  37    float s = a + b;
  38
  39    if (s == 0.0f) return t;
  40    if (s > 1.0f)
  41    {
  42       a /= s;
  43       b /= s;
  44    }
  45    k = 1.0f/(2.0f-a-b);
  46    if (t < a) return (k/a)*t*t;
  47    if (t < 1.0f - b) return k*(2.0f * t - a);
  48    t = 1.0f - t;
  49    return 1.0f - (k/b)*t*t;
  50 }*/
  51
  52 public enum FrameTrackType : uint16 { position = 1, rotation, scaling, fov, roll, colorChange, morph, hotSpot, fallOff, hide };
  53
  54 public class FrameTrackBits
  55 {
  56    FrameTrackType type;
  57    bool loop:1;
  58 };
  59
  60 public struct FrameKey
  61 {
  62    unsigned int frame;
  63    float tension, continuity, bias;
  64    float easeFrom, easeTo;
  65    union
  66    {
  67       Vector3Df position;
  68       Quaternion orientation;
  69       Vector3Df scaling;
  70       float roll;
  71       float fov;
  72       ColorRGB color;
  73       float hotSpot;
  74       float fallOff;
  75    };
  76 };
  77
  78 enum SplinePart { splinePoint, splineA, splineB };
  79
  80 public class FrameTrack : struct
  81 {
  82    FrameTrack prev, next;
  83    FrameTrackBits type;
  84    unsigned int numKeys;
  85    FrameKey * keys;
  86
  87    void Free(void)
  88    {
  89       delete keys;
  90    }
  91
  92    ~FrameTrack()
  93    {
  94       Free();
  95    }
  96
  97    float GetFloat(SplinePart what, unsigned int n)
  98    {
  99       float value;
 100       FrameKey *kn_1, *kn, *kn1;
 101       float pn_1, pn, pn1;
 102       int d1, d2;
 103
 104       kn = &keys[n];
 105       pn = kn->roll;
 106
 107       if(what == splinePoint)
 108          value = pn;
 109       else
 110       {
 111          if(n == 0)
 112          {
 113             kn1 = &keys[1];
 114             pn1 = kn1->roll;
 115
 116             if(numKeys == 2)
 117             {
 118                value = pn1 - pn;
 119                value *= 1.0f - kn->tension;
 120                return value;
 121             }
 122             if(type.loop)
 123             {
 124                kn_1 = &keys[numKeys-2];
 125                d1 = keys[numKeys-1].frame - kn_1->frame;
 126                d2 = kn1->frame - kn->frame;
 127             }
 128             else
 129             {
 130                float a1;
 131                value = pn1 - pn;
 132                value *= 1.5f;
 133
 134                a1 = GetFloat(splineA, 1);
 135                a1 *= 0.5f;
 136
 137                value -= a1;
 138                value *= 1.0f - kn->tension;
 139                return value;
 140             }
 141          }
 142          else if(n == numKeys-1)
 143          {
 144             kn_1 = &keys[n-1];
 145             pn_1 = kn_1->roll;
 146
 147             if(numKeys == 2)
 148             {
 149                value = pn - pn_1;
 150                value *= 1.0f - kn->tension;
 151                return value;
 152             }
 153             if(type.loop)
 154             {
 155                kn1 = &keys[1];
 156                d1 = kn->frame - kn_1->frame;
 157                d2 = kn1->frame - keys[0].frame;
 158             }
 159             else
 160             {
 161                float bn_1;
 162                value = pn - pn_1;
 163                value *= 1.5f;
 164
 165                bn_1 = GetFloat(splineB, n-1);
 166                bn_1 *= 0.5f;
 167
 168                value -= bn_1;
 169                value *= 1.0f - kn->tension;
 170                return value;
 171             }
 172          }
 173          else
 174          {
 175             kn_1 = &keys[n-1];
 176             kn1 = &keys[n+1];
 177             d1 = kn->frame - kn_1->frame;
 178             d2 = kn1->frame - kn->frame;
 179          }
 180          {
 181             float C, adjust;
 182             float part1, part2;
 183
 184             pn_1 = kn_1->roll;
 185             pn1 = kn1->roll;
 186
 187             if(what == splineA)
 188             {
 189                C = kn->continuity;
 190                adjust = (float)d1;
 191             }
 192             else
 193             {
 194                C = -kn->continuity;
 195                adjust = (float)d2;
 196             }
 197             adjust /= d1 + d2;
 198             adjust = 0.5f + (1.0f - Abs(C))*(adjust - 0.5f);
 199
 200             part1 = pn - pn_1;
 201             part1 *= (1.0f + kn->bias)*(1.0f - C);
 202
 203             part2 = pn1 - pn;
 204             part2 *= (1.0f - kn->bias)*(1.0f + C);
 205
 206             value = part1 + part2;
 207             value *= (1.0f - kn->tension)*adjust;
 208          }
 209       }
 210       return value;
 211    }
 212
 213    void GetVector(Vector3Df vector, SplinePart what, unsigned int n)
 214    {
 215       FrameKey *kn_1, *kn, *kn1;
 216       Vector3Df *pn_1, *pn, *pn1;
 217       int d1, d2;
 218
 219       kn = &keys[n];
 220       pn = &kn->position;
 221
 222       if(what == splinePoint)
 223          vector = *pn;
 224       else
 225       {
 226          if(n == 0)
 227          {
 228             kn1 = &keys[1];
 229             pn1 = &kn1->position;
 230
 231             if(numKeys == 2)
 232             {
 233                vector.Subtract(pn1, pn);
 234                vector.Scale(vector, 1.0f - kn->tension);
 235                return;
 236             }
 237             if(type.loop)
 238             {
 239                kn_1 = &keys[numKeys-2];
 240                d1 = keys[numKeys-1].frame - kn_1->frame;
 241                d2 = kn1->frame - kn->frame;
 242             }
 243             else
 244             {
 245                Vector3Df a1;
 246                vector.Subtract(pn1, pn);
 247                vector.Scale(vector, 1.5f);
 248
 249                GetVector(a1, splineA, 1);
 250                a1.Scale(a1, 0.5f);
 251
 252                vector.Subtract(vector, a1);
 253                vector.Scale(vector, 1.0f - kn->tension);
 254                return;
 255             }
 256          }
 257          else if(n == numKeys-1)
 258          {
 259             kn_1 = &keys[n-1];
 260             pn_1 = &kn_1->position;
 261
 262             if(numKeys == 2)
 263             {
 264                vector.Subtract(pn, pn_1);
 265                vector.Scale(vector, 1.0f - kn->tension);
 266                return;
 267             }
 268             if(type.loop)
 269             {
 270                kn1 = &keys[1];
 271                d1 = kn->frame - kn_1->frame;
 272                d2 = kn1->frame - keys[0].frame;
 273             }
 274             else
 275             {
 276                Vector3Df bn_1;
 277                vector.Subtract(pn, pn_1);
 278                vector.Scale(vector, 1.5f);
 279
 280                GetVector(&bn_1, splineB, n-1);
 281                bn_1.Scale(bn_1, 0.5f);
 282
 283                vector.Subtract(vector, bn_1);
 284                vector.Scale(vector, 1.0f - kn->tension);
 285                return;
 286             }
 287          }
 288          else
 289          {
 290             kn_1 = &keys[n-1];
 291             kn1 = &keys[n+1];
 292             d1 = kn->frame - kn_1->frame;
 293             d2 = kn1->frame - kn->frame;
 294          }
 295          {
 296             float C, adjust;
 297             Vector3Df part1, part2;
 298
 299             pn_1 = &kn_1->position;
 300             pn1 = &kn1->position;
 301
 302             if(what == splineA)
 303             {
 304                C = kn->continuity;
 305                adjust = (float)d1;
 306             }
 307             else
 308             {
 309                C = -kn->continuity;
 310                adjust = (float)d2;
 311             }
 312             adjust /= d1 + d2;
 313             adjust = 0.5f + (1.0f - Abs(C))*(adjust - 0.5f);
 314
 315             part1.Subtract(pn, pn_1);
 316             part1.Scale(part1, (1.0f + kn->bias)*(1.0f - C));
 317
 318             part2.Subtract(pn1, pn);
 319             part2.Scale(part2, (1.0f - kn->bias)*(1.0f + C));
 320
 321             vector.Add(part1, part2);
 322             vector.Scale(vector, (1.0f - kn->tension)*adjust);
 323          }
 324       }
 325    }
 326
 327    void GetQuaternion(Quaternion quat, SplinePart what, unsigned int n)
 328    {
 329       FrameKey *kn_1, *kn, *kn1;
 330       Quaternion *qn_1, *qn, *qn1;
 331       int d1, d2;
 332
 333       kn = &keys[n];
 334       qn = &kn->orientation;
 335
 336       if (what == splinePoint)
 337          quat = *qn;
 338       else
 339       {
 340          if(n == 0)
 341          {
 342             kn1 = &keys[1];
 343
 344             if (!(type.loop) || numKeys <= 2)
 345             {
 346                qn1 = &kn1->orientation;
 347                quat.Slerp(qn, qn1, (1.0f - kn->tension)*(1.0f + kn->continuity*kn->bias)/3.0f);
 348                return;
 349             }
 350             else
 351             {
 352                kn_1= &keys[numKeys-2];
 353                d1 = keys[numKeys-1].frame - kn_1->frame;
 354                d2 = kn1->frame - kn->frame;
 355             }
 356          }
 357          else if (n == numKeys-1)
 358          {
 359             kn_1 = &keys[n-1];
 360
 361             if (!(type.loop) || numKeys <= 2)
 362             {
 363                qn_1 = &kn_1->orientation;
 364                quat.Slerp(qn, qn_1, (1.0f - kn->tension)*(1.0f - kn->continuity*kn->bias)/3.0f);
 365                return;
 366             }
 367             else
 368             {
 369                kn1 = &keys[1];
 370                d1 = kn->frame - kn_1->frame;
 371                d2 = kn1->frame - keys[0].frame;
 372             }
 373          }
 374          else
 375          {
 376             kn_1 = &keys[n-1];
 377             kn1 = &keys[n+1];
 378             d1 = kn->frame - kn_1->frame;
 379             d2 = kn1->frame - kn->frame;
 380          }
 381          {
 382             float f, adjust;
 383             Quaternion g1, g2, tmp;
 384
 385             qn_1 = &kn_1->orientation;
 386             qn1 = &kn1->orientation;
 387
 388             if (what == splineA)
 389             {
 390                f = 1.0f;
 391                adjust = (float)d1;
 392             }
 393             else
 394             {
 395                f = -1.0f;
 396                adjust = (float)d2;
 397             }
 398             adjust /= d1 + d2;
 399             adjust = 0.5f + (1.0f - Abs(kn->continuity))*(adjust - 0.5f);
 400
 401             g1.Slerp(qn, qn_1,-(1.0f + kn->bias)/3.0f);
 402             g2.Slerp(qn, qn1 , (1.0f - kn->bias)/3.0f);
 403             tmp.Slerp(g1, g2, 0.5f + f*0.5f*kn->continuity);
 404             quat.Slerp(qn, &tmp, f*(kn->tension - 1.0f)*adjust*2.0f);
 405          }
 406       }
 407    }
 408
 409    void Interpolate(Vector3Df vector, Vector3Df prevVector, Vector3Df nextVector, int prev, int next, float t)
 410    {
 411       if(!t)
 412          vector = prevVector;
 413       else
 414       {
 415          Vector3Df p1 = prevVector, p2 = nextVector;
 416          Vector3Df r1, r2;
 417
 418          GetVector(r1, splineB, prev);
 419          GetVector(r2, splineA, next);
 420
 421          p1.Scale(p1, 2*t*t*t - 3*t*t + 1);
 422          p2.Scale(p2,-2*t*t*t + 3*t*t);
 423
 424          r1.Scale(r1, t*t*t - 2*t*t + t);
 425          r2.Scale(r2, t*t*t -   t*t);
 426
 427          vector = p1;
 428          vector.Add(vector, r1);
 429          vector.Add(vector, p2);
 430          vector.Add(vector, r2);
 431       }
 432    }
 433
 434    void InterpolateQuat(Quaternion quat, Quaternion prevQuat, Quaternion nextQuat, int prev, int next, float t)
 435    {
 436       if(!t)
 437          quat = prevQuat;
 438       else
 439       {
 440          Quaternion a, b;
 441          Quaternion q0, q1, q2;
 442
 443          GetQuaternion(b, splineB, prev);
 444          GetQuaternion(a, splineA, next);
 445
 446          q0.Slerp(prevQuat, b, t);
 447          q1.Slerp(b, a, t);
 448          q2.Slerp(a, nextQuat, t);
 449
 450          q0.Slerp(q0, q1, t);
 451          q1.Slerp(q1, q2, t);
 452
 453          quat.Slerp(q0, q1, t);
 454       }
 455    }
 456
 457    float InterpolateFloat(float prevValue, float nextValue, int prev, int next, float t)
 458    {
 459       float value;
 460       if(!t)
 461          value = prevValue;
 462       else
 463       {
 464          float p1 = prevValue, p2 = nextValue;
 465
 466          float r1 = GetFloat(splineB, prev);
 467          float r2 = GetFloat(splineA, next);
 468
 469          p1 *= 2*t*t*t - 3*t*t + 1;
 470          p2 *= -2*t*t*t + 3*t*t;
 471
 472          r1 *= t*t*t - 2*t*t + t;
 473          r2 *= t*t*t -   t*t;
 474
 475          value = p1 + r1 + p2 + r2;
 476       }
 477       return value;
 478    }
 479 };
 480
 481 static bool FindMaterialAndType(Mesh mesh, Material material, PrimitiveGroupType type)
 482 {
 483    PrimitiveGroup group;
 484    for(group = mesh.groups.first; group; group = group.next)
 485       if(group.material == material && group.type == type)
 486          return true;
 487    return false;
 488 }
 489
 490 public class Object
 491 {
 492 public:
 493    void SetMinMaxRadius(bool processMesh)
 494    {
 495       Object child;
 496
 497       if(flags.mesh && mesh)
 498       {
 499          if(processMesh)
 500             mesh.SetMinMaxRadius();
 501          min = mesh.min;
 502          max = mesh.max;
 503          volume = (max.x >= min.x && max.y >= min.y && max.z >= min.z);
 504       }
 505       else
 506       {
 507          min = { MAXFLOAT, MAXFLOAT, MAXFLOAT };
 508          max = { -MAXFLOAT, -MAXFLOAT, -MAXFLOAT };
 509          volume = false;
 510       }
 511       for(child = children.first; child; child = child.next)
 512       {
 513          child.SetMinMaxRadius(processMesh);
 514
 515          if(child.volume)
 516          {
 517             // Child Local + Child Object Transform
 518             Vector3Df points[8] =
 519             {
 520                { child.min.x, child.min.y, child.min.z },
 521                { child.min.x, child.min.y, child.max.z },
 522                { child.min.x, child.max.y, child.min.z },
 523                { child.min.x, child.max.y, child.max.z },
 524                { child.max.x, child.min.y, child.min.z },
 525                { child.max.x, child.min.y, child.max.z },
 526                { child.max.x, child.max.y, child.min.z },
 527                { child.max.x, child.max.y, child.max.z }
 528             };
 529             int c;
 530             for(c = 0; c<8; c++)
 531             {
 532                Vector3Df point;
 533                point.MultMatrix(points[c], child.localMatrix);
 534
 535                if(point.x < min.x) min.x = point.x;
 536                if(point.y < min.y) min.y = point.y;
 537                if(point.z < min.z) min.z = point.z;
 538
 539                if(point.x > max.x) max.x = point.x;
 540                if(point.y > max.y) max.y = point.y;
 541                if(point.z > max.z) max.z = point.z;
 542             }
 543             volume = true;
 544          }
 545       }
 546
 547       if(volume)
 548       {
 549          Vector3Df points[8] =
 550          {
 551             { min.x, min.y, min.z },
 552             { min.x, min.y, max.z },
 553             { min.x, max.y, min.z },
 554             { min.x, max.y, max.z },
 555             { max.x, min.y, min.z },
 556             { max.x, min.y, max.z },
 557             { max.x, max.y, min.z },
 558             { max.x, max.y, max.z }
 559          };
 560          Vector3Df halfExtent;
 561          Vector3D halfExtentd;
 562
 563          // Local
 564          center.Add(min, max);
 565          center.Scale(center, 0.5f);
 566          halfExtent.Subtract(max, min);
 567          halfExtent.Scale(halfExtent, 0.5f);
 568          radius = halfExtent.length;
 569
 570          // World
 571          {
 572             Vector3D min { MAXFLOAT, MAXFLOAT, MAXFLOAT };
 573             Vector3D max { -MAXFLOAT, -MAXFLOAT, -MAXFLOAT };
 574             int c;
 575             for(c = 0; c<8; c++)
 576             {
 577                Vector3D point;
 578                point.MultMatrixf(points[c], matrix);
 579
 580                if(point.x < min.x) min.x = point.x;
 581                if(point.y < min.y) min.y = point.y;
 582                if(point.z < min.z) min.z = point.z;
 583
 584                if(point.x > max.x) max.x = point.x;
 585                if(point.y > max.y) max.y = point.y;
 586                if(point.z > max.z) max.z = point.z;
 587             }
 588             wmin = min;
 589             wmax = max;
 590          }
 591          wcenter.Add(wmin, wmax);
 592          wcenter.Scale(wcenter, 0.5f);
 593
 594          halfExtentd.Subtract(wmax, wmin);
 595          halfExtentd.Scale(halfExtentd, 0.5);
 596          wradius = halfExtentd.length;
 597       }
 598    }
 599
 600    void Duplicate(Object model)
 601    {
 602       if(model)
 603       {
 604          Object modelChild;
 605
 606          name = CopyString(model.name);
 607          flags = model.flags;
 608          flags.ownMesh = false;
 609          flags.transform = false;
 610          mesh = model.mesh;
 611          /*
 612          min = model.min;
 613          max = model.max;
 614          radius = model.radius;
 615          */
 616          if(parent && !flags.root)
 617             matrix.Multiply(localMatrix, parent.matrix);
 618          else
 619             matrix = localMatrix;
 620
 621          for(modelChild = model.children.first; modelChild; modelChild = modelChild.next)
 622          {
 623             Object child { parent = this };
 624             child.localMatrix = modelChild.localMatrix;
 625             child.transform = modelChild.transform;
 626             child.Duplicate(modelChild);
 627             children.AddName(child);
 628          }
 629       }
 630    }
 631
 632    void Free(DisplaySystem displaySystem)
 633    {
 634       if(this)
 635       {
 636          Object child;
 637
 638          while((child = children.first))
 639          {
 640             children.Remove(child);
 641             child.Free(displaySystem);
 642
 643             // We did not do this before so as to keep transform on reloading for new DisplaySystem
 644             // However since children are removed, it seems that purpose has been gone, we'd need
 645             // a new mechanism to handle lost resources reloading...
 646             delete child;
 647          }
 648          if(flags.ownMesh && mesh)
 649          {
 650             DisplaySystem meshDisplaySystem = mesh.displaySystem;
 651             mesh.Free(0);
 652             if(meshDisplaySystem)
 653                meshDisplaySystem.RemoveMesh(mesh);
 654             delete mesh;
 655          }
 656
 657          tracks.Free(FrameTrack::Free);
 658
 659          delete name;
 660       }
 661    }
 662
 663    bool Load(const char * fileName, const char * type, DisplaySystem displaySystem)
 664    {
 665       char ext[MAX_EXTENSION];
 666       subclass(ObjectFormat) format;
 667       OldLink link;
 668       bool result = false;
 669
 670       if(!type && fileName)
 671          type = strlwr(GetExtension(fileName, ext));
 672
 673       for(link = class(ObjectFormat).derivatives.first; link; link = link.next)
 674       {
 675          format = link.data;
 676          if(format.extension && !strcmp(format.extension, type))
 677             break;
 678       }
 679       if(!link) format = null;
 680
 681       if(format)
 682       {
 683          if((format.Load(this, fileName, displaySystem)))
 684             result = true;
 685       }
 686       /*if(!result)
 687           ErrorLogCode(GERR_LOAD_OBJECT_FAILED, fileName);*/
 688       return result;
 689    }
 690
 691    void FreeMesh(DisplaySystem displaySystem)
 692    {
 693       if(this)
 694       {
 695          Object child;
 696          mesh.Free(0);
 697          for(child = children.first; child; child = child.next)
 698             child.FreeMesh(displaySystem);
 699       }
 700    }
 701
 702    Object Find(const char * name)
 703    {
 704       if(this && name)
 705       {
 706          Object child;
 707
 708          if(this.name && !strcmp(this.name, name))
 709             return this;
 710          else
 711          {
 712             for(child = children.first; child; child = child.next)
 713             {
 714                Object result = child.Find(name);
 715                if(result)
 716                   return result;
 717             }
 718          }
 719       }
 720       return null;
 721    }
 722
 723    void Initialize(void)
 724    {
 725       if(this)
 726       {
 727          transform.scaling = { 1, 1, 1 };
 728          transform.orientation = { 1,0,0,0 };
 729          flags.root = true;
 730          flags.transform = true;
 731          matrix.Identity();
 732       }
 733    }
 734
 735    Mesh InitializeMesh(DisplaySystem displaySystem)
 736    {
 737       if(this)
 738       {
 739          flags.mesh = true;
 740          if(!mesh)
 741          {
 742             mesh = Mesh { };
 743             flags.ownMesh = true;
 744          }
 745          if(mesh)
 746          {
 747             FillBytes(mesh, 0, sizeof(class Mesh));
 748             displaySystem.AddMesh(mesh);
 749          }
 750          matrix.Identity();
 751          return mesh;
 752       }
 753       return null;
 754    }
 755
 756    bool AddName(Object object, const char * name)
 757    {
 758       bool result = false;
 759       if(this)
 760       {
 761          char * newName = CopyString(name);
 762          object.name = newName;
 763          result = children.AddName(object);
 764          if(result)
 765             object.parent = this;
 766          object.flags.transform = true;
 767       }
 768       return result;
 769    }
 770
 771    // TODO: Add support to Merge Vertex Colors mesh feature
 772    bool Merge(DisplaySystem displaySystem)
 773    {
 774       bool result = false;
 775
 776       if(!this.flags.mesh || (!children.first && this.flags.ownMesh))
 777          result = true;
 778       else
 779       {
 780          Object child, nextChild;
 781          int nVertices = 0;
 782          MeshFeatures flags = 0;
 783          Mesh objectMesh = mesh;
 784          bool freeMesh = this.flags.ownMesh;
 785
 786          mesh = Mesh { };
 787          this.flags.ownMesh = true;
 788          this.flags.mesh = true;
 789          displaySystem.AddMesh(mesh);
 790
 791          // Count total number of vertices
 792          if(objectMesh)
 793          {
 794             flags |= objectMesh.flags;
 795             nVertices += objectMesh.nVertices;
 796          }
 797
 798          for(child = children.first; child; child = child.next)
 799          {
 800             child.Merge(displaySystem);
 801             if(child.mesh)
 802             {
 803                nVertices += child.mesh.nVertices;
 804                flags |= child.mesh.flags;
 805             }
 806          }
 807
 808          if(mesh.Allocate(flags, nVertices, displaySystem))
 809          {
 810             int c;
 811             int nTriangles = 0;
 812             int vertexOffset = 0;
 813             PrimitiveGroup group = null;
 814
 815             // Merge vertices
 816
 817             nVertices = 0;
 818             if(objectMesh)
 819             {
 820                for(c = 0; c<objectMesh.nVertices; c++)
 821                {
 822                   mesh.vertices[nVertices] = objectMesh.vertices[c];
 823
 824                   if(objectMesh.normals)
 825                      mesh.normals[nVertices] = objectMesh.normals[c];
 826                   if(objectMesh.texCoords)
 827                      mesh.texCoords[nVertices] = objectMesh.texCoords[c];
 828
 829                   nVertices++;
 830                }
 831             }
 832
 833             for(child = children.first; child; child = child.next)
 834             {
 835                Matrix matrix, normalMatrix;
 836
 837                matrix = child.localMatrix;
 838                /*
 839                matrix.Identity();
 840                matrix.Scale(child.transform.scaling.x, child.transform.scaling.y, child.transform.scaling.z);
 841                matrix.Rotate(child.transform.orientation);
 842                */
 843
 844                normalMatrix = matrix;
 845
 846                normalMatrix.m[3][0] = 0;
 847                normalMatrix.m[3][1] = 0;
 848                normalMatrix.m[3][2] = 0;
 849
 850                // matrix.Translate(child.transform.position.x, child.transform.position.y, child.transform.position.z);
 851
 852                if(child.mesh)
 853                {
 854                   for(c = 0; c<child.mesh.nVertices; c++)
 855                   {
 856                      mesh.vertices[nVertices].MultMatrix(child.mesh.vertices[c], matrix);
 857                      if(child.mesh.normals)
 858                         mesh.normals[nVertices].MultMatrix(child.mesh.normals[c], normalMatrix);
 859                      if(child.mesh.texCoords)
 860                         mesh.texCoords[nVertices] = child.mesh.texCoords[c];
 861                      nVertices++;
 862                   }
 863                }
 864             }
 865
 866             // Merge Indexed Primitive Groups
 867             while(true)
 868             {
 869                int nIndices = 0;
 870                PrimitiveGroupType type = (PrimitiveGroupType)-1;
 871                Material material = null;
 872                bool foundGroup = false;
 873
 874                // Find first group type/material to process and determine how many indices are required
 875                if(objectMesh)
 876                {
 877                   for(group = objectMesh.groups.first; group; group = group.next)
 878                   {
 879                      if(!foundGroup && !(group.type.vertexRange))
 880                      {
 881                         if(!FindMaterialAndType(mesh, group.material, group.type))
 882                         {
 883                            material = group.material;
 884                            type = group.type;
 885                            nIndices += group.nIndices;
 886                            foundGroup = true;
 887                         }
 888                      }
 889                      else if(material == group.material && type == group.type)
 890                         nIndices += group.nIndices;
 891                   }
 892                }
 893
 894                for(child = children.first; child; child = child.next)
 895                {
 896                   if(child.mesh)
 897                   {
 898                      for(group = child.mesh.groups.first; group; group = group.next)
 899                      {
 900                         if(!foundGroup && !(group.type.vertexRange))
 901                         {
 902                            if(!FindMaterialAndType(mesh, group.material ? group.material : child.material, group.type))
 903                            {
 904                               material = group.material ? group.material : child.material;
 905                               type = group.type;
 906                               nIndices += group.nIndices;
 907                               foundGroup = true;
 908                            }
 909                         }
 910                         else if(material == (group.material ? group.material : child.material) && type == group.type)
 911                            nIndices += group.nIndices;
 912                      }
 913                   }
 914                }
 915
 916                // Merge with all similar groups
 917                if(foundGroup)
 918                {
 919                   PrimitiveGroup newGroup = mesh.AddPrimitiveGroup(type, nIndices);
 920                   if(newGroup)
 921                   {
 922                      newGroup.material = material;
 923                      nIndices = 0;
 924
 925                      vertexOffset = 0;
 926
 927                      if(objectMesh)
 928                      {
 929                         for(group = objectMesh.groups.first; group; group = group.next)
 930                         {
 931                            if(newGroup.material == group.material && newGroup.type == group.type)
 932                            {
 933                               int c;
 934                               if(group.type.indices32bit)
 935                                  for(c = 0; c<group.nIndices; c++)
 936                                     newGroup.indices32[nIndices++] = group.indices32[c] + vertexOffset;
 937                               else
 938                                  for(c = 0; c<group.nIndices; c++)
 939                                     newGroup.indices[nIndices++] = (uint16)(group.indices[c] + vertexOffset);
 940                            }
 941                         }
 942                         vertexOffset += objectMesh.nVertices;
 943                      }
 944
 945                      for(child = children.first; child; child = child.next)
 946                      {
 947                         if(child.mesh)
 948                         {
 949                            for(group = child.mesh.groups.first; group; group = group.next)
 950                            {
 951                               if(newGroup.material == (group.material ? group.material : child.material) &&
 952                                  newGroup.type == group.type)
 953                               {
 954                                  int c;
 955                                  if(group.type.indices32bit)
 956                                     for(c = 0; c<group.nIndices; c++)
 957                                        newGroup.indices32[nIndices++] = group.indices32[c] + vertexOffset;
 958                                  else
 959                                     for(c = 0; c<group.nIndices; c++)
 960                                        newGroup.indices[nIndices++] = (uint16)(group.indices[c] + vertexOffset);
 961                               }
 962                            }
 963                            vertexOffset += child.mesh.nVertices;
 964                         }
 965                      }
 966                      mesh.UnlockPrimitiveGroup(newGroup);
 967                   }
 968                }
 969                else
 970                   break;
 971             }
 972
 973             // Merge Non-Indexed Primitive Groups
 974             vertexOffset = 0;
 975
 976             if(objectMesh)
 977             {
 978                for(group = objectMesh.groups.first; group; group = group.next)
 979                {
 980                   if(group.type.vertexRange)
 981                   {
 982                      PrimitiveGroup newGroup = mesh.AddPrimitiveGroup(group.type, 0);
 983                      if(newGroup)
 984                      {
 985                         newGroup.material = group.material;
 986                         newGroup.nVertices = group.nVertices;
 987                         newGroup.first = group.first + vertexOffset;
 988                      }
 989                   }
 990                }
 991                vertexOffset += objectMesh.nVertices;
 992             }
 993
 994             for(child = children.first; child; child = child.next)
 995             {
 996                if(child.mesh)
 997                {
 998                   for(group = child.mesh.groups.first; group; group = group.next)
 999                   {
1000                      if(group.type.vertexRange)
1001                      {
1002                         PrimitiveGroup newGroup = mesh.AddPrimitiveGroup(group.type, 0);
1003                         if(newGroup)
1004                         {
1005                            newGroup.material = group.material ? group.material : child.material;
1006                            newGroup.nVertices = group.nVertices;
1007                            newGroup.first = group.first + vertexOffset;
1008                         }
1009                      }
1010                   }
1011                   vertexOffset += child.mesh.nVertices;
1012                }
1013             }
1014
1015             // Merge Triangles
1016             if(objectMesh)
1017                nTriangles = objectMesh.nPrimitives;
1018
1019             for(child = children.first; child; child = child.next)
1020             {
1021                if(child.mesh)
1022                   nTriangles += child.mesh.nPrimitives;
1023             }
1024             mesh.primitives = new PrimitiveSingle[nTriangles];
1025             mesh.nPrimitives = 0;
1026             vertexOffset = 0;
1027             if(objectMesh)
1028             {
1029                for(c = 0; c<objectMesh.nPrimitives; c++)
1030                {
1031                   int i;
1032                   PrimitiveSingle * triangle = &mesh.primitives[mesh.nPrimitives++];
1033
1034                   mesh.AllocatePrimitive(triangle, objectMesh.primitives[c].type, objectMesh.primitives[c].nIndices);
1035                   triangle->material = objectMesh.primitives[c].material;
1036                   triangle->middle = objectMesh.primitives[c].middle;
1037                   triangle->plane = objectMesh.primitives[c].plane;
1038
1039                   memcpy(triangle->indices, objectMesh.primitives[c].indices, objectMesh.primitives[c].nIndices * sizeof(uint16));
1040
1041                   /*
1042                   *triangle = objectMesh.primitives[c];
1043                   objectMesh.primitives[c].indices = null;
1044                   objectMesh.primitives[c].data = null;
1045                   */
1046
1047                   if(triangle->type.indices32bit)
1048                      for(i = 0; i<triangle->nIndices; i++)
1049                         triangle->indices32[i] += vertexOffset;
1050                   else
1051                      for(i = 0; i<triangle->nIndices; i++)
1052                         triangle->indices[i] += (uint16)vertexOffset;
1053                   mesh.UnlockPrimitive(triangle);
1054                }
1055                vertexOffset += objectMesh.nVertices;
1056             }
1057             for(child = children.first; child; child = child.next)
1058             {
1059                if(child.mesh)
1060                {
1061                   for(c = 0; c<child.mesh.nPrimitives; c++)
1062                   {
1063                      int i;
1064                      PrimitiveSingle * triangle = &mesh.primitives[mesh.nPrimitives++];
1065
1066                      mesh.AllocatePrimitive(triangle, child.mesh.primitives[c].type, child.mesh.primitives[c].nIndices);
1067                      triangle->material = child.mesh.primitives[c].material ? child.mesh.primitives[c].material : child.material;
1068                      triangle->middle = child.mesh.primitives[c].middle;
1069                      triangle->plane = child.mesh.primitives[c].plane;
1070                      memcpy(triangle->indices, child.mesh.primitives[c].indices, child.mesh.primitives[c].nIndices * sizeof(uint16));
1071
1072                      /*
1073                      *triangle = child.mesh.primitives[c];
1074                      child.mesh.primitives[c].indices = null;
1075                      child.mesh.primitives[c].data = null;
1076                      */
1077
1078                      if(triangle->type.indices32bit)
1079                         for(i = 0; i<triangle->nIndices; i++)
1080                            triangle->indices[i] += (uint16)vertexOffset;
1081                      else
1082                         for(i = 0; i<triangle->nIndices; i++)
1083                            triangle->indices32[i] += vertexOffset;
1084                      mesh.UnlockPrimitive(triangle);
1085                   }
1086                   vertexOffset += child.mesh.nVertices;
1087                }
1088             }
1089
1090             // Free children
1091             for(child = children.first; child; child = nextChild)
1092             {
1093                nextChild = child.next;
1094                children.Remove(child);
1095                child.Free(displaySystem);
1096                delete child;
1097             }
1098
1099             mesh.ApplyTranslucency(this);
1100             // this.flags.translucent = true;
1101
1102             result = true;
1103
1104             mesh.Unlock(flags);
1105          }
1106          if(freeMesh && objectMesh)
1107          {
1108             if(objectMesh.displaySystem)
1109                objectMesh.displaySystem.RemoveMesh(objectMesh);
1110             delete objectMesh;
1111          }
1112          SetMinMaxRadius(true);
1113       }
1114       return result;
1115    }
1116
1117    void RotateEuler(Euler rotation, Euler min, Euler max)
1118    {
1119       // WARNING: 'eulerOrientation' is only updated by this function
1120       Euler euler = eulerOrientation;//transform.orientation;
1121       euler.Add(euler, rotation);
1122
1123       if(min && max)
1124       {
1125          if(min.pitch && max.pitch)
1126             euler.pitch = Min(Max(euler.pitch, min.pitch), max.pitch);
1127          if(min.yaw && max.yaw)
1128             euler.yaw = Min(Max(euler.yaw, min.yaw), max.yaw);
1129          if(min.roll && max.roll)
1130             euler.roll = Min(Max(euler.roll, min.roll), max.roll);
1131       }
1132
1133       eulerOrientation = euler;
1134       transform.orientation = euler;
1135       UpdateTransform();
1136    }
1137
1138    void Move(Vector3D direction)
1139    {
1140       Matrix matrix;
1141       Vector3D offset;
1142
1143       matrix.RotationQuaternion(transform.orientation);
1144       offset.MultMatrix(direction, matrix);
1145       transform.position.Add(transform.position, offset);
1146       UpdateTransform();
1147    }
1148
1149    void UpdateTransform(void)
1150    {
1151       SetTransformDirty();
1152       _UpdateTransform();
1153       SetMinMaxRadius(false);
1154    }
1155
1156    void Animate(unsigned int frame)
1157    {
1158       if(this && startFrame != endFrame)
1159       {
1160          while(frame < startFrame) frame += (endFrame - startFrame + 1);
1161          while(frame > endFrame)   frame -= (endFrame - startFrame + 1);
1162
1163          this.frame = frame;
1164          _Animate(frame);
1165          _UpdateTransform();
1166          SetMinMaxRadius(false);
1167       }
1168    }
1169
1170    void DoubleSided(bool flag)
1171    {
1172       if(this)
1173       {
1174          Object child;
1175          mesh.DoubleSided(flag);
1176          for(child = children.first; child; child = child.next)
1177             child.DoubleSided(flag);
1178       }
1179    }
1180
1181    bool IntersectsGroundPolygon(int count, Pointf * pointfs)
1182    {
1183       bool result = false;
1184
1185       Pointf * p1;
1186       Pointf * p2;
1187       double minX = wmin.x, maxX = wmax.x;
1188       double minY = wmin.z, maxY = wmax.z;
1189       double delta = (maxX - minX)/2;
1190       double x = (maxX + minX)/2, y = (maxY + minY)/2;
1191       int c;
1192       for(c = 0; c<count; c++)
1193       {
1194          double d;
1195          p1 = &pointfs[c];
1196          p2 = &pointfs[(c == count-1) ? 0 : (c+1)];
1197
1198          if( (p1->x < minX) &&  (p2->x < minX) )
1199          {
1200             if((p1->y <= y) && (p2->y >  y) )
1201                result ^= true;
1202             else if( (p1->y >  y) && (p2->y <= y) )
1203                result ^= true;
1204          }
1205          else if(!((p1->x > maxX && p2->x > maxX) || (p1->y < minY && p2->y < minY) || (p1->y > maxY && p2->y > maxY)))
1206          {
1207             if(p1->y == p2->y)
1208             {
1209                d = y - p1->y;
1210                if (d < 0) d = -d;
1211                if (d < delta) return true;
1212             }
1213             else if(p1->x == p2->x)
1214             {
1215                d = x - p1->x;
1216                if(d < 0) d = -d;
1217                if(d < delta) return true;
1218                else if(p1->x > x) ;
1219                else if( (p1->y <= y) && (p2->y >  y) )
1220                   result ^= true;
1221                else if( (p1->y >  y) && (p2->y <= y) )
1222                   result ^= true;
1223             }
1224             else
1225             {
1226                float a, b, dy, dx;
1227
1228                a = p2->y - p1->y;
1229                b = p1->x - p2->x;
1230                dy =  a;
1231                dx = -b;
1232                d = a * x + b * y + (p2->x * p1->y) - (p2->y * p1->x);
1233                if (a < 0) a = -a;
1234                if (b < 0) b = -b;
1235                if (d < 0) d = -d;
1236
1237                if(d < a * delta)
1238                   return true;
1239                else if (d < b * delta)
1240                   return true;
1241                else if( ( (p1->y <= y) && (p2->y >  y) ) || ( (p1->y >  y) && (p2->y <= y) ) )
1242                {
1243                   double xdy;
1244
1245                   xdy = (dx * (y - p1->y)) + (dy * p1->x);
1246                   if(dy < 0)
1247                   {
1248                      if(xdy > x * dy)
1249                         result ^= true;
1250                   }
1251                   else if(xdy < x * dy)
1252                      result ^= true;
1253                }
1254             }
1255          }
1256       }
1257       return result;
1258    }
1259
1260    property Transform transform { set { transform = value; eulerOrientation = transform.orientation; } get { value = transform; } };
1261    property Material material { set { material = value; } get { return material; } };
1262    property Vector3Df max { get { value = max; } };
1263    property Vector3Df min { get { value = min; } };
1264    property Vector3Df center { get { value = center; } };
1265    property float radius { get { return radius; } };
1266
1267    property Vector3D wmax { get { value = wmax; } };
1268    property Vector3D wmin { get { value = wmin; } };
1269    property Vector3D wcenter { get { value = wcenter; } };
1270    property double wradius { get { return wradius; } };
1271
1272    property void * tag { set { tag = value; } get { return tag; } };
1273    property int frame { set { Animate(value); } get { return frame; } };
1274    property int startFrame { set { startFrame = value; } get { return startFrame; } };
1275    property int endFrame { set { endFrame = value; } get { return endFrame; } };
1276
1277    property Mesh mesh { set { mesh = value; } get { return mesh; } };
1278    property Camera camera { get { return camera; } }; // Fix this with inheritance? camera inherit from Object?
1279    property Object firstChild { get { return children.first; } };
1280    property Object next { get { return next; } };
1281    property const char * name { get { return name; } };
1282    property Matrix matrix { get { value = matrix; } };
1283    property Object cameraTarget { set { cameraTarget = value; } get { return cameraTarget; } };
1284    property OldList * tracks { /* set { tracks = value; } */ get { return &tracks; } };
1285    property ObjectFlags flags { set { flags = value; } get { return flags; } };
1286
1287 private:
1288    Object()
1289    {
1290       children.offset = (uint)(uintptr)&((Object)0).prev;
1291       transform.scaling = { 1, 1, 1 };
1292       transform.orientation = { 1,0,0,0 };
1293       flags.transform = true;
1294       localMatrix.Identity();
1295    }
1296
1297    ~Object()
1298    {
1299       Free(null);
1300    }
1301
1302    void SetTransformDirty()
1303    {
1304       Object child;
1305       flags.transform = true;
1306       for(child = children.first; child; child = child.next)
1307          child.SetTransformDirty();
1308    }
1309
1310    void _UpdateTransform()
1311    {
1312       if(flags.transform)
1313       {
1314          Object child;
1315
1316          // Cameras / Spot Lights must update their target first
1317          if(flags.camera && cameraTarget && cameraTarget.flags.transform)
1318             cameraTarget.UpdateTransform();
1319          else if(flags.light && light.flags.spot && light.target && light.target.flags.transform)
1320             light.target._UpdateTransform();
1321
1322          if(flags.camera && cameraTarget)
1323          {
1324             // Determine angle to look at target
1325             Vector3D position, direction;
1326             if(flags.root || !parent)
1327                position = transform.position;
1328             else
1329                position.MultMatrix(transform.position, parent.matrix);
1330
1331             direction.Subtract((Vector3D *)cameraTarget.matrix.m[3], position);
1332             transform.orientation.RotationDirection(direction);
1333
1334             // Add the roll
1335             transform.orientation.RotateRoll(roll);
1336          }
1337
1338          if(flags.light && light.flags.spot)
1339          {
1340             // Determine angle to look at target
1341             Vector3D position;
1342             if(flags.root || !parent)
1343                position = transform.position;
1344             else
1345                position.MultMatrix(transform.position, parent.matrix);
1346
1347             if(light.target)
1348                light.direction.Subtract((Vector3D *) light.target.matrix.m[3], position);
1349             else
1350                light.direction = position; // TOCHECK: Why does this happen?
1351
1352             light.direction.Normalize(light.direction);
1353             transform.orientation.RotationDirection(light.direction);
1354          }
1355
1356          if(!flags.localMatrixSet)
1357          {
1358             localMatrix.Identity();
1359             localMatrix.Scale(transform.scaling.x, transform.scaling.y, transform.scaling.z);
1360             localMatrix.Rotate(transform.orientation);
1361             localMatrix.Translate(transform.position.x, transform.position.y, transform.position.z);
1362          }
1363
1364          // Compute transform (with ancestors)
1365          if(flags.root || !parent)
1366             matrix = localMatrix;
1367          else
1368             matrix.Multiply(localMatrix, parent.matrix);
1369
1370          flags.transform = false;
1371
1372          for(child = children.first; child; child = child.next)
1373          {
1374             if(child.flags.transform)
1375                child._UpdateTransform();
1376          }
1377       }
1378    }
1379
1380    void _Animate(unsigned int frame)
1381    {
1382       Object child;
1383       FrameTrack track;
1384
1385       for(track = tracks.first; track; track = track.next)
1386       {
1387          unsigned int c;
1388
1389          if(track.numKeys)
1390          {
1391             unsigned int prev = 0, next = track.numKeys - 1;
1392             FrameKey * prevKey = &track.keys[prev], * nextKey = &track.keys[next];
1393             float t = 0;
1394
1395             for(c = 0; c<track.numKeys; c++)
1396             {
1397                FrameKey * key = track.keys + c;
1398                if(key->frame <= frame) { prevKey = key; prev = c; }
1399                if(key->frame >= frame) { nextKey = key; next = c; break; }
1400             }
1401
1402             if(nextKey->frame != prevKey->frame)
1403                t = ease((float) (frame - prevKey->frame) / (nextKey->frame - prevKey->frame), prevKey->easeFrom, nextKey->easeTo);
1404
1405             switch(track.type.type)
1406             {
1407                case position:
1408                {
1409                   Vector3Df position;
1410                   track.Interpolate(position, prevKey->position, nextKey->position, prev, next, t);
1411                   transform.position = { (double)position.x, (double)position.y, (double)position.z };
1412                   break;
1413                }
1414                case scaling:
1415                   track.Interpolate(transform.scaling, prevKey->scaling, &nextKey->scaling, prev, next, t);
1416                   break;
1417                case rotation:
1418                   track.InterpolateQuat(transform.orientation, prevKey->orientation, nextKey->orientation, prev, next, t);
1419                   break;
1420                // Cameras
1421                case roll:
1422                   roll = track.InterpolateFloat(prevKey->roll, nextKey->roll, prev, next, t);
1423                   break;
1424                case fov:
1425                {
1426                   camera.fov = track.InterpolateFloat(prevKey->fov, nextKey->fov, prev, next, t);
1427                   /*
1428                   double mm = (camera.fov - 5.05659508373109) / 1.13613250717301;
1429                   camera.fov = 1248.58921609766 * pow(mm, -0.895625414990581);
1430                   */
1431                   //camera.Setup(camera.width, camera.height, camera.origin);
1432                   break;
1433                }
1434                // Lights
1435                case colorChange:
1436                {
1437                   track.Interpolate((Vector3Df *)&light.diffuse,
1438                      (Vector3Df *)&prevKey->color, (Vector3Df *)&nextKey->color, prev, next, t);
1439                   light.specular = light.diffuse;
1440                   break;
1441                }
1442                case fallOff:
1443                {
1444                   light.fallOff = track.InterpolateFloat(prevKey->fallOff, nextKey->fallOff, prev, next, t);
1445                   break;
1446                }
1447                case hotSpot:
1448                {
1449                   light.hotSpot = track.InterpolateFloat(prevKey->hotSpot, nextKey->hotSpot, prev, next, t);
1450                   break;
1451                }
1452             }
1453          }
1454       }
1455
1456       for(child = children.first; child; child = child.next)
1457          child._Animate(frame);
1458
1459       flags.transform = true;
1460    }
1461
1462    // Private for now
1463    FrustumPlacement InsideFrustum(Plane * planes)
1464    {
1465       FrustumPlacement result = inside;
1466
1467       int p;
1468       // First test: Sphere
1469       for(p = 0; p<6; p++)
1470       {
1471          Plane * plane = &planes[p];
1472          double dot = plane->normal.DotProduct(wcenter);
1473          double distance = dot + plane->d;
1474          if(distance < -wradius)
1475          {
1476             result = outside;
1477             break;
1478          }
1479          if(Abs(distance) < wradius)
1480             result = intersecting;
1481       }
1482
1483       if(result == intersecting)
1484       {
1485          // Second test: Bounding Box
1486          Vector3D box[8] =
1487          {
1488             { wmin.x, wmin.y, wmin.z },
1489             { wmin.x, wmin.y, wmax.z },
1490             { wmin.x, wmax.y, wmin.z },
1491             { wmin.x, wmax.y, wmax.z },
1492             { wmax.x, wmin.y, wmin.z },
1493             { wmax.x, wmin.y, wmax.z },
1494             { wmax.x, wmax.y, wmin.z },
1495             { wmax.x, wmax.y, wmax.z }
1496          };
1497            int numPlanesAllIn = 0;
1498          for(p = 0; p < 6; p++)
1499          {
1500             Plane * plane = &planes[p];
1501             int i;
1502             int numGoodPoints = 0;
1503             for(i = 0; i < 8; ++i)
1504             {
1505                double dot = plane->normal.DotProduct(box[i]);
1506                double distance = dot + plane->d;
1507                            if(distance > -1)
1508                   numGoodPoints++;
1509                    }
1510                    if(!numGoodPoints)
1511             {
1512                result = outside;
1513                break;
1514             }
1515             if(numGoodPoints == 8)
1516                numPlanesAllIn++;
1517            }
1518            if(numPlanesAllIn == 6)
1519                    result = inside;
1520       }
1521       return result;
1522    }
1523
1524    Object prev, next;
1525    char * name;
1526    public Object parent;
1527    public OldList children;
1528
1529    ObjectFlags flags;
1530
1531    OldList tracks;
1532    unsigned startFrame, endFrame;
1533    int frame;
1534    Vector3Df pivot;
1535
1536    public Transform transform;
1537    public Matrix matrix;
1538    public Matrix localMatrix;
1539    void * tag;
1540    Vector3Df min, max, center;
1541    Vector3D wmin, wmax, wcenter;
1542
1543    bool volume;
1544    float radius;
1545    double wradius;
1546    ColorRGB ambient;
1547
1548    /*public */union
1549    {
1550       // Mesh
1551       struct
1552       {
1553          Mesh mesh;
1554          Material material;
1555       };
1556
1557       // Light
1558       Light light;
1559
1560       // Camera
1561       struct
1562       {
1563          Camera camera;
1564          Object cameraTarget;
1565          double roll;
1566       };
1567    };
1568
1569    public property Light light
1570    {
1571       set
1572       {
1573          light = value;
1574       }
1575       get
1576       {
1577          value = light;
1578       }
1579    }
1580
1581    Euler eulerOrientation;
1582 };