summaryrefslogtreecommitdiff
path: root/macros/latex/contrib/media9/javascript/3Dmenu.js
blob: 9037d040dd3200f9e7f2ccec1d33c59c97f3763b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
////////////////////////////////////////////////////////////////////////////////
//
// (C) 2012--today, Alexander Grahn
//
// 3Dmenu.js
//
// version 20140923
//
////////////////////////////////////////////////////////////////////////////////
//
// 3D JavaScript used by media9.sty
//
// Extended functionality of the (right click) context menu of 3D annotations.
//
//  1.) Adds the following items to the 3D context menu:
//
//   * `Generate Default View'
//
//      Finds good default camera settings, returned as options for use with
//      the \includemedia command.
//
//   * `Get Current View'
//
//      Determines camera, cross section and part settings of the current view,
//      returned as `VIEW' section that can be copied into a views file of
//      additional views. The views file is inserted using the `3Dviews' option
//      of \includemedia.
//
//   * `Cross Section'
//
//      Toggle switch to add or remove a cross section into or from the current
//      view. The cross section can be moved in the x, y, z directions using x,
//      y, z and X, Y, Z keys on the keyboard, be tilted against and spun
//      around the upright Z axis using the Up/Down and Left/Right arrow keys
//      and caled using the s and S keys.
//
//  2.) Enables manipulation of position and orientation of indiviual parts and
//      groups of parts in the 3D scene. Parts which have been selected with the
//      mouse can be scaled moved around and rotated like the cross section as
//      described above. To spin the parts around their local up-axis, keep
//      Control key pressed while using the Up/Down and Left/Right arrow keys.
//
// This work may be distributed and/or modified under the
// conditions of the LaTeX Project Public License.
// 
// The latest version of this license is in
//   http://mirrors.ctan.org/macros/latex/base/lppl.txt
// 
// This work has the LPPL maintenance status `maintained'.
// 
// The Current Maintainer of this work is A. Grahn.
//
// The code borrows heavily from Bernd Gaertners `Miniball' software,
// originally written in C++, for computing the smallest enclosing ball of a
// set of points; see: http://www.inf.ethz.ch/personal/gaertner/miniball.html
//
////////////////////////////////////////////////////////////////////////////////
//host.console.show();

//constructor for doubly linked list
function List(){
  this.first_node=null;
  this.last_node=new Node(undefined);
}
List.prototype.push_back=function(x){
  var new_node=new Node(x);
  if(this.first_node==null){
    this.first_node=new_node;
    new_node.prev=null;
  }else{
    new_node.prev=this.last_node.prev;
    new_node.prev.next=new_node;
  }
  new_node.next=this.last_node;
  this.last_node.prev=new_node;
};
List.prototype.move_to_front=function(it){
  var node=it.get();
  if(node.next!=null && node.prev!=null){
    node.next.prev=node.prev;
    node.prev.next=node.next;
    node.prev=null;
    node.next=this.first_node;
    this.first_node.prev=node;
    this.first_node=node;
  }
};
List.prototype.begin=function(){
  var i=new Iterator();
  i.target=this.first_node;
  return(i);
};
List.prototype.end=function(){
  var i=new Iterator();
  i.target=this.last_node;
  return(i);
};
function Iterator(it){
  if( it!=undefined ){
    this.target=it.target;
  }else {
    this.target=null;
  }
}
Iterator.prototype.set=function(it){this.target=it.target;};
Iterator.prototype.get=function(){return(this.target);};
Iterator.prototype.deref=function(){return(this.target.data);};
Iterator.prototype.incr=function(){
  if(this.target.next!=null) this.target=this.target.next;
};
//constructor for node objects that populate the linked list
function Node(x){
  this.prev=null;
  this.next=null;
  this.data=x;
}
function sqr(r){return(r*r);}//helper function

//Miniball algorithm by B. Gaertner
function Basis(){
  this.m=0;
  this.q0=new Array(3);
  this.z=new Array(4);
  this.f=new Array(4);
  this.v=new Array(new Array(3), new Array(3), new Array(3), new Array(3));
  this.a=new Array(new Array(3), new Array(3), new Array(3), new Array(3));
  this.c=new Array(new Array(3), new Array(3), new Array(3), new Array(3));
  this.sqr_r=new Array(4);
  this.current_c=this.c[0];
  this.current_sqr_r=0;
  this.reset();
}
Basis.prototype.center=function(){return(this.current_c);};
Basis.prototype.size=function(){return(this.m);};
Basis.prototype.pop=function(){--this.m;};
Basis.prototype.excess=function(p){
  var e=-this.current_sqr_r;
  for(var k=0;k<3;++k){
    e+=sqr(p[k]-this.current_c[k]);
  }
  return(e);
};
Basis.prototype.reset=function(){
  this.m=0;
  for(var j=0;j<3;++j){
    this.c[0][j]=0;
  }
  this.current_c=this.c[0];
  this.current_sqr_r=-1;
};
Basis.prototype.push=function(p){
  var i, j;
  var eps=1e-32;
  if(this.m==0){
    for(i=0;i<3;++i){
      this.q0[i]=p[i];
    }
    for(i=0;i<3;++i){
      this.c[0][i]=this.q0[i];
    }
    this.sqr_r[0]=0;
  }else {
    for(i=0;i<3;++i){
      this.v[this.m][i]=p[i]-this.q0[i];
    }
    for(i=1;i<this.m;++i){
      this.a[this.m][i]=0;
      for(j=0;j<3;++j){
        this.a[this.m][i]+=this.v[i][j]*this.v[this.m][j];
      }
      this.a[this.m][i]*=(2/this.z[i]);
    }
    for(i=1;i<this.m;++i){
      for(j=0;j<3;++j){
        this.v[this.m][j]-=this.a[this.m][i]*this.v[i][j];
      }
    }
    this.z[this.m]=0;
    for(j=0;j<3;++j){
      this.z[this.m]+=sqr(this.v[this.m][j]);
    }
    this.z[this.m]*=2;
    if(this.z[this.m]<eps*this.current_sqr_r) return(false);
    var e=-this.sqr_r[this.m-1];
    for(i=0;i<3;++i){
      e+=sqr(p[i]-this.c[this.m-1][i]);
    }
    this.f[this.m]=e/this.z[this.m];
    for(i=0;i<3;++i){
      this.c[this.m][i]=this.c[this.m-1][i]+this.f[this.m]*this.v[this.m][i];
    }
    this.sqr_r[this.m]=this.sqr_r[this.m-1]+e*this.f[this.m]/2;
  }
  this.current_c=this.c[this.m];
  this.current_sqr_r=this.sqr_r[this.m];
  ++this.m;
  return(true);
};
function Miniball(){
  this.L=new List();
  this.B=new Basis();
  this.support_end=new Iterator();
}
Miniball.prototype.mtf_mb=function(it){
  var i=new Iterator(it);
  this.support_end.set(this.L.begin());
  if((this.B.size())==4) return;
  for(var k=new Iterator(this.L.begin());k.get()!=i.get();){
    var j=new Iterator(k);
    k.incr();
    if(this.B.excess(j.deref()) > 0){
      if(this.B.push(j.deref())){
        this.mtf_mb(j);
        this.B.pop();
        if(this.support_end.get()==j.get())
          this.support_end.incr();
        this.L.move_to_front(j);
      }
    }
  }
};
Miniball.prototype.check_in=function(b){
  this.L.push_back(b);
};
Miniball.prototype.build=function(){
  this.B.reset();
  this.support_end.set(this.L.begin());
  this.mtf_mb(this.L.end());
};
Miniball.prototype.center=function(){
  return(this.B.center());
};
Miniball.prototype.radius=function(){
  return(Math.sqrt(this.B.current_sqr_r));
};

//functions called by menu items
function calc3Dopts () {
  //create Miniball object
  var mb=new Miniball();
  //auxiliary vector
  var corner=new Vector3();
  //iterate over all visible mesh nodes in the scene
  for(i=0;i<scene.meshes.count;i++){
    var mesh=scene.meshes.getByIndex(i);
    if(!mesh.visible) continue;
    //local to parent transformation matrix
    var trans=mesh.transform;
    //build local to world transformation matrix by recursively
    //multiplying the parent's transf. matrix on the right
    var parent=mesh.parent;
    while(parent.transform){
      trans=trans.multiply(parent.transform);
      parent=parent.parent;
    }
    //get the bbox of the mesh (local coordinates)
    var bbox=mesh.computeBoundingBox();
    //transform the local bounding box corner coordinates to
    //world coordinates for bounding sphere determination
    //BBox.min
    corner.set(bbox.min);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    //BBox.max
    corner.set(bbox.max);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    //remaining six BBox corners
    corner.set(bbox.min.x, bbox.max.y, bbox.max.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    corner.set(bbox.min.x, bbox.min.y, bbox.max.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    corner.set(bbox.min.x, bbox.max.y, bbox.min.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    corner.set(bbox.max.x, bbox.min.y, bbox.min.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    corner.set(bbox.max.x, bbox.min.y, bbox.max.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
    corner.set(bbox.max.x, bbox.max.y, bbox.min.z);
    corner.set(trans.transformPosition(corner));
    mb.check_in(new Array(corner.x, corner.y, corner.z));
  }
  //compute the smallest enclosing bounding sphere
  mb.build();
  //
  //current camera settings
  //
  var camera=scene.cameras.getByIndex(0);
  var res=''; //initialize result string
  //aperture angle of the virtual camera (perspective projection) *or*
  //orthographic scale (orthographic projection)
  if(camera.projectionType==camera.TYPE_PERSPECTIVE){
    var aac=camera.fov*180/Math.PI;
    if(host.util.printf('%.4f', aac)!=30)
      res+=host.util.printf('\n3Daac=%s,', aac);
  }else{
      camera.viewPlaneSize=2.*mb.radius();
      res+=host.util.printf('\n3Dortho=%s,', 1./camera.viewPlaneSize);
  }
  //camera roll
  var roll = camera.roll*180/Math.PI;
  if(host.util.printf('%.4f', roll)!=0)
    res+=host.util.printf('\n3Droll=%s,',roll);
  //target to camera vector
  var c2c=new Vector3();
  c2c.set(camera.position);
  c2c.subtractInPlace(camera.targetPosition);
  c2c.normalize();
  if(!(c2c.x==0 && c2c.y==-1 && c2c.z==0))
    res+=host.util.printf('\n3Dc2c=%s %s %s,', c2c.x, c2c.y, c2c.z);
  //
  //new camera settings
  //
  //bounding sphere centre --> new camera target
  var coo=new Vector3();
  coo.set((mb.center())[0], (mb.center())[1], (mb.center())[2]);
  if(coo.length)
    res+=host.util.printf('\n3Dcoo=%s %s %s,', coo.x, coo.y, coo.z);
  //radius of orbit
  if(camera.projectionType==camera.TYPE_PERSPECTIVE){
    var roo=mb.radius()/ Math.sin(aac * Math.PI/ 360.);
  }else{
    //orthographic projection
    var roo=mb.radius();
  }
  res+=host.util.printf('\n3Droo=%s,', roo);
  //update camera settings in the viewer
  var currol=camera.roll;
  camera.targetPosition.set(coo);
  camera.position.set(coo.add(c2c.scale(roo)));
  camera.roll=currol;
  //determine background colour
  rgb=scene.background.getColor();
  if(!(rgb.r==1 && rgb.g==1 && rgb.b==1))
    res+=host.util.printf('\n3Dbg=%s %s %s,', rgb.r, rgb.g, rgb.b);
  //determine lighting scheme
  switch(scene.lightScheme){
    case scene.LIGHT_MODE_FILE:
      curlights='Artwork';break;
    case scene.LIGHT_MODE_NONE:
      curlights='None';break;
    case scene.LIGHT_MODE_WHITE:
      curlights='White';break;
    case scene.LIGHT_MODE_DAY:
      curlights='Day';break;
    case scene.LIGHT_MODE_NIGHT:
      curlights='Night';break;
    case scene.LIGHT_MODE_BRIGHT:
      curlights='Hard';break;
    case scene.LIGHT_MODE_RGB:
      curlights='Primary';break;
    case scene.LIGHT_MODE_BLUE:
      curlights='Blue';break;
    case scene.LIGHT_MODE_RED:
      curlights='Red';break;
    case scene.LIGHT_MODE_CUBE:
      curlights='Cube';break;
    case scene.LIGHT_MODE_CAD:
      curlights='CAD';break;
    case scene.LIGHT_MODE_HEADLAMP:
      curlights='Headlamp';break;
  }
  if(curlights!='Artwork')
    res+=host.util.printf('\n3Dlights=%s,', curlights);
  //determine global render mode
  switch(scene.renderMode){
    case scene.RENDER_MODE_BOUNDING_BOX:
      currender='BoundingBox';break;
    case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX:
      currender='TransparentBoundingBox';break;
    case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX_OUTLINE:
      currender='TransparentBoundingBoxOutline';break;
    case scene.RENDER_MODE_VERTICES:
      currender='Vertices';break;
    case scene.RENDER_MODE_SHADED_VERTICES:
      currender='ShadedVertices';break;
    case scene.RENDER_MODE_WIREFRAME:
      currender='Wireframe';break;
    case scene.RENDER_MODE_SHADED_WIREFRAME:
      currender='ShadedWireframe';break;
    case scene.RENDER_MODE_SOLID:
      currender='Solid';break;
    case scene.RENDER_MODE_TRANSPARENT:
      currender='Transparent';break;
    case scene.RENDER_MODE_SOLID_WIREFRAME:
      currender='SolidWireframe';break;
    case scene.RENDER_MODE_TRANSPARENT_WIREFRAME:
      currender='TransparentWireframe';break;
    case scene.RENDER_MODE_ILLUSTRATION:
      currender='Illustration';break;
    case scene.RENDER_MODE_SOLID_OUTLINE:
      currender='SolidOutline';break;
    case scene.RENDER_MODE_SHADED_ILLUSTRATION:
      currender='ShadedIllustration';break;
    case scene.RENDER_MODE_HIDDEN_WIREFRAME:
      currender='HiddenWireframe';break;
  }
  if(currender!='Solid')
    res+=host.util.printf('\n3Drender=%s,', currender);
  //write result string to the console
  host.console.show();
//  host.console.clear();
  host.console.println('%%\n%% Copy and paste the following text to the\n'+
    '%% option list of \\includemedia!\n%%' + res + '\n');
}

function get3Dview () {
  var camera=scene.cameras.getByIndex(0);
  var coo=camera.targetPosition;
  var c2c=camera.position.subtract(coo);
  var roo=c2c.length;
  c2c.normalize();
  var res='VIEW%=insert optional name here\n';
  if(!(coo.x==0 && coo.y==0 && coo.z==0))
    res+=host.util.printf('  COO=%s %s %s\n', coo.x, coo.y, coo.z);
  if(!(c2c.x==0 && c2c.y==-1 && c2c.z==0))
    res+=host.util.printf('  C2C=%s %s %s\n', c2c.x, c2c.y, c2c.z);
  if(roo > 1e-9)
    res+=host.util.printf('  ROO=%s\n', roo);
  var roll = camera.roll*180/Math.PI;
  if(host.util.printf('%.4f', roll)!=0)
    res+=host.util.printf('  ROLL=%s\n', roll);
  if(camera.projectionType==camera.TYPE_PERSPECTIVE){
    var aac=camera.fov * 180/Math.PI;
    if(host.util.printf('%.4f', aac)!=30)
      res+=host.util.printf('  AAC=%s\n', aac);
  }else{
    if(host.util.printf('%.4f', camera.viewPlaneSize)!=1)
      res+=host.util.printf('  ORTHO=%s\n', 1./camera.viewPlaneSize);
  }
  rgb=scene.background.getColor();
  if(!(rgb.r==1 && rgb.g==1 && rgb.b==1))
    res+=host.util.printf('  BGCOLOR=%s %s %s\n', rgb.r, rgb.g, rgb.b);
  switch(scene.lightScheme){
    case scene.LIGHT_MODE_FILE:
      curlights='Artwork';break;
    case scene.LIGHT_MODE_NONE:
      curlights='None';break;
    case scene.LIGHT_MODE_WHITE:
      curlights='White';break;
    case scene.LIGHT_MODE_DAY:
      curlights='Day';break;
    case scene.LIGHT_MODE_NIGHT:
      curlights='Night';break;
    case scene.LIGHT_MODE_BRIGHT:
      curlights='Hard';break;
    case scene.LIGHT_MODE_RGB:
      curlights='Primary';break;
    case scene.LIGHT_MODE_BLUE:
      curlights='Blue';break;
    case scene.LIGHT_MODE_RED:
      curlights='Red';break;
    case scene.LIGHT_MODE_CUBE:
      curlights='Cube';break;
    case scene.LIGHT_MODE_CAD:
      curlights='CAD';break;
    case scene.LIGHT_MODE_HEADLAMP:
      curlights='Headlamp';break;
  }
  if(curlights!='Artwork')
    res+='  LIGHTS='+curlights+'\n';
  switch(scene.renderMode){
    case scene.RENDER_MODE_BOUNDING_BOX:
      defaultrender='BoundingBox';break;
    case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX:
      defaultrender='TransparentBoundingBox';break;
    case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX_OUTLINE:
      defaultrender='TransparentBoundingBoxOutline';break;
    case scene.RENDER_MODE_VERTICES:
      defaultrender='Vertices';break;
    case scene.RENDER_MODE_SHADED_VERTICES:
      defaultrender='ShadedVertices';break;
    case scene.RENDER_MODE_WIREFRAME:
      defaultrender='Wireframe';break;
    case scene.RENDER_MODE_SHADED_WIREFRAME:
      defaultrender='ShadedWireframe';break;
    case scene.RENDER_MODE_SOLID:
      defaultrender='Solid';break;
    case scene.RENDER_MODE_TRANSPARENT:
      defaultrender='Transparent';break;
    case scene.RENDER_MODE_SOLID_WIREFRAME:
      defaultrender='SolidWireframe';break;
    case scene.RENDER_MODE_TRANSPARENT_WIREFRAME:
      defaultrender='TransparentWireframe';break;
    case scene.RENDER_MODE_ILLUSTRATION:
      defaultrender='Illustration';break;
    case scene.RENDER_MODE_SOLID_OUTLINE:
      defaultrender='SolidOutline';break;
    case scene.RENDER_MODE_SHADED_ILLUSTRATION:
      defaultrender='ShadedIllustration';break;
    case scene.RENDER_MODE_HIDDEN_WIREFRAME:
      defaultrender='HiddenWireframe';break;
  }
  if(defaultrender!='Solid')
    res+='  RENDERMODE='+defaultrender+'\n';

  //detect existing Clipping Plane (3D Cross Section)
  var clip=null;
  if(
    clip=scene.nodes.getByName('$$$$$$')||
    clip=scene.nodes.getByName('Clipping Plane')
  );
  for(var i=0;i<scene.nodes.count;i++){
    var nd=scene.nodes.getByIndex(i);
    if(nd==clip||nd.name=='') continue;
    var ndUTFName='';
    for (var j=0; j<nd.name.length; j++) {
      var theUnicode = nd.name.charCodeAt(j).toString(16);
      while (theUnicode.length<4) theUnicode = '0' + theUnicode;
      ndUTFName += theUnicode;
    }
    var end=nd.name.lastIndexOf('.');
    if(end>0) var ndUserName=nd.name.substr(0,end);
    else var ndUserName=nd.name;
    respart='  PART='+ndUserName+'\n';
    respart+='    UTF16NAME='+ndUTFName+'\n';
    defaultvals=true;
    if(!nd.visible){
      respart+='    VISIBLE=false\n';
      defaultvals=false;
    }
    if(nd.opacity<1.0){
      respart+='    OPACITY='+nd.opacity+'\n';
      defaultvals=false;
    }
    if(nd.constructor.name=='Mesh'){
      currender=defaultrender;
      switch(nd.renderMode){
        case scene.RENDER_MODE_BOUNDING_BOX:
          currender='BoundingBox';break;
        case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX:
          currender='TransparentBoundingBox';break;
        case scene.RENDER_MODE_TRANSPARENT_BOUNDING_BOX_OUTLINE:
          currender='TransparentBoundingBoxOutline';break;
        case scene.RENDER_MODE_VERTICES:
          currender='Vertices';break;
        case scene.RENDER_MODE_SHADED_VERTICES:
          currender='ShadedVertices';break;
        case scene.RENDER_MODE_WIREFRAME:
          currender='Wireframe';break;
        case scene.RENDER_MODE_SHADED_WIREFRAME:
          currender='ShadedWireframe';break;
        case scene.RENDER_MODE_SOLID:
          currender='Solid';break;
        case scene.RENDER_MODE_TRANSPARENT:
          currender='Transparent';break;
        case scene.RENDER_MODE_SOLID_WIREFRAME:
          currender='SolidWireframe';break;
        case scene.RENDER_MODE_TRANSPARENT_WIREFRAME:
          currender='TransparentWireframe';break;
        case scene.RENDER_MODE_ILLUSTRATION:
          currender='Illustration';break;
        case scene.RENDER_MODE_SOLID_OUTLINE:
          currender='SolidOutline';break;
        case scene.RENDER_MODE_SHADED_ILLUSTRATION:
          currender='ShadedIllustration';break;
        case scene.RENDER_MODE_HIDDEN_WIREFRAME:
          currender='HiddenWireframe';break;
        //case scene.RENDER_MODE_DEFAULT:
        //  currender='Default';break;
      }
      if(currender!=defaultrender){
        respart+='    RENDERMODE='+currender+'\n';
        defaultvals=false;
      }
    }
    if(origtrans[nd.name]&&!nd.transform.isEqual(origtrans[nd.name])){
      var lvec=nd.transform.transformDirection(new Vector3(1,0,0));
      var uvec=nd.transform.transformDirection(new Vector3(0,1,0));
      var vvec=nd.transform.transformDirection(new Vector3(0,0,1));
      respart+='    TRANSFORM='
               +lvec.x+' '+lvec.y+' '+lvec.z+' '
               +uvec.x+' '+uvec.y+' '+uvec.z+' '
               +vvec.x+' '+vvec.y+' '+vvec.z+' '
               +nd.transform.translation.x+' '
               +nd.transform.translation.y+' '
               +nd.transform.translation.z+'\n';
      defaultvals=false;
    }
    respart+='  END\n';
    if(!defaultvals) res+=respart;
  }
  if(clip){
    var centre=clip.transform.translation;
    var normal=clip.transform.transformDirection(new Vector3(0,0,1));
    res+='  CROSSSECT\n';
    if(!(centre.x==0 && centre.y==0 && centre.z==0))
      res+=host.util.printf(
        '    CENTER=%s %s %s\n', centre.x, centre.y, centre.z);
    if(!(normal.x==1 && normal.y==0 && normal.z==0))
      res+=host.util.printf(
        '    NORMAL=%s %s %s\n', normal.x, normal.y, normal.z);
    res+=host.util.printf(
      '    VISIBLE=%s\n', clip.visible);
    res+=host.util.printf(
      '    PLANECOLOR=%s %s %s\n', clip.material.emissiveColor.r,
             clip.material.emissiveColor.g, clip.material.emissiveColor.b);
    res+=host.util.printf(
      '    OPACITY=%s\n', clip.opacity);
    res+=host.util.printf(
      '    INTERSECTIONCOLOR=%s %s %s\n',
        clip.wireframeColor.r, clip.wireframeColor.g, clip.wireframeColor.b);
    res+='  END\n';
//    for(var propt in clip){
//      console.println(propt+':'+clip[propt]);
//    }
  }
  res+='END\n';
  host.console.show();
//  host.console.clear();
  host.console.println('%%\n%% Add the following VIEW section to a file of\n'+
    '%% predefined views (See option "3Dviews"!).\n%%\n' +
    '%% The view may be given a name after VIEW=...\n' +
    '%% (Remove \'%\' in front of \'=\'.)\n%%');
  host.console.println(res + '\n');
}

//add items to 3D context menu
runtime.addCustomMenuItem("dfltview", "Generate Default View", "default", 0);
runtime.addCustomMenuItem("currview", "Get Current View", "default", 0);
runtime.addCustomMenuItem("csection", "Cross Section", "checked", 0);

//menu event handlers
menuEventHandler = new MenuEventHandler();
menuEventHandler.onEvent = function(e) {
  switch(e.menuItemName){
    case "dfltview": calc3Dopts(); break;
    case "currview": get3Dview(); break;
    case "csection":
      addremoveClipPlane(e.menuItemChecked);
      break;
  }
};
runtime.addEventHandler(menuEventHandler);

//global variable taking reference to currently selected node;
var target=null;
selectionEventHandler=new SelectionEventHandler();
selectionEventHandler.onEvent=function(e){
  if(e.selected&&e.node.name!=''){
    target=e.node;
  }else{
    target=null;
  }
}
runtime.addEventHandler(selectionEventHandler);

cameraEventHandler=new CameraEventHandler();
cameraEventHandler.onEvent=function(e){
  var clip=null;
  runtime.removeCustomMenuItem("csection");
  runtime.addCustomMenuItem("csection", "Cross Section", "checked", 0);
  if(clip=scene.nodes.getByName('$$$$$$')|| //predefined
    scene.nodes.getByName('Clipping Plane')){ //added via context menu
    runtime.removeCustomMenuItem("csection");
    runtime.addCustomMenuItem("csection", "Cross Section", "checked", 1);
  }
  if(clip){//plane in predefined views must be rotated by 90 deg around normal
    clip.transform.rotateAboutLineInPlace(
      Math.PI/2,clip.transform.translation,
      clip.transform.transformDirection(new Vector3(0,0,1))
    );
  }
  for(var i=0; i<rot4x4.length; i++){rot4x4[i].setIdentity()}
  target=null;
}
runtime.addEventHandler(cameraEventHandler);

var rot4x4=new Array(); //keeps track of spin and tilt axes transformations
//key event handler for scaling moving, spinning and tilting objects
keyEventHandler=new KeyEventHandler();
keyEventHandler.onEvent=function(e){
  var backtrans=new Matrix4x4();
  var trgt=null;
  if(target) {
    trgt=target;
    var backtrans=new Matrix4x4();
    var trans=trgt.transform;
    var parent=trgt.parent;
    while(parent.transform){
      //build local to world transformation matrix
      trans.multiplyInPlace(parent.transform);
      //also build world to local back-transformation matrix
      backtrans.multiplyInPlace(parent.transform.inverse.transpose);
      parent=parent.parent;
    }
    backtrans.transposeInPlace();
  }else{
    if(
      trgt=scene.nodes.getByName('$$$$$$')||
      trgt=scene.nodes.getByName('Clipping Plane')
    ) var trans=trgt.transform;
  }
  if(!trgt) return;

  var tname=trgt.name;
  if(typeof(rot4x4[tname])=='undefined') rot4x4[tname]=new Matrix4x4();
  if(target)
    var tiltAxis=rot4x4[tname].transformDirection(new Vector3(0,1,0));
  else  
    var tiltAxis=trans.transformDirection(new Vector3(0,1,0));
  var spinAxis=rot4x4[tname].transformDirection(new Vector3(0,0,1));

  //get the centre of the mesh
  if(target&&trgt.constructor.name=='Mesh'){
    var centre=trans.transformPosition(trgt.computeBoundingBox().center);
  }else{ //part group (Node3 parent node, clipping plane)
    var centre=new Vector3(trans.translation);
  }
  switch(e.characterCode){
    case 30://tilt up
      rot4x4[tname].rotateAboutLineInPlace(
          -Math.PI/900,rot4x4[tname].translation,tiltAxis);
      trans.rotateAboutLineInPlace(-Math.PI/900,centre,tiltAxis);
      break;
    case 31://tilt down
      rot4x4[tname].rotateAboutLineInPlace(
          Math.PI/900,rot4x4[tname].translation,tiltAxis);
      trans.rotateAboutLineInPlace(Math.PI/900,centre,tiltAxis);
      break;
    case 28://spin right
      if(e.ctrlKeyDown&&target){
        trans.rotateAboutLineInPlace(-Math.PI/900,centre,spinAxis);
      }else{
        rot4x4[tname].rotateAboutLineInPlace(
            -Math.PI/900,rot4x4[tname].translation,new Vector3(0,0,1));
        trans.rotateAboutLineInPlace(-Math.PI/900,centre,new Vector3(0,0,1));
      }
      break;
    case 29://spin left
      if(e.ctrlKeyDown&&target){
        trans.rotateAboutLineInPlace(Math.PI/900,centre,spinAxis);
      }else{
        rot4x4[tname].rotateAboutLineInPlace(
            Math.PI/900,rot4x4[tname].translation,new Vector3(0,0,1));
        trans.rotateAboutLineInPlace(Math.PI/900,centre,new Vector3(0,0,1));
      }
      break;
    case 120: //x
      translateTarget(trans, new Vector3(1,0,0), e);
      break;
    case 121: //y
      translateTarget(trans, new Vector3(0,1,0), e);
      break;
    case 122: //z
      translateTarget(trans, new Vector3(0,0,1), e);
      break;
    case 88: //shift + x
      translateTarget(trans, new Vector3(-1,0,0), e);
      break;
    case 89: //shift + y
      translateTarget(trans, new Vector3(0,-1,0), e);
      break;
    case 90: //shift + z
      translateTarget(trans, new Vector3(0,0,-1), e);
      break;
    case 115: //s
      trans.translateInPlace(centre.scale(-1));
      trans.scaleInPlace(1.01);
      trans.translateInPlace(centre.scale(1));
      break;
    case 83: //shift + s
      trans.translateInPlace(centre.scale(-1));
      trans.scaleInPlace(1/1.01);
      trans.translateInPlace(centre.scale(1));
      break;
  }
  trans.multiplyInPlace(backtrans);
}
runtime.addEventHandler(keyEventHandler);

//translates object by amount calculated from Canvas size
function translateTarget(t, d, e){
  var cam=scene.cameras.getByIndex(0);
  if(cam.projectionType==cam.TYPE_PERSPECTIVE){
    var scale=Math.tan(cam.fov/2)
              *cam.targetPosition.subtract(cam.position).length
              /Math.min(e.canvasPixelWidth,e.canvasPixelHeight);
  }else{
    var scale=cam.viewPlaneSize/2
              /Math.min(e.canvasPixelWidth,e.canvasPixelHeight);
  }
  t.translateInPlace(d.scale(scale));
}

function addremoveClipPlane(chk) {
  var curTrans=getCurTrans();
  var clip=scene.createClippingPlane();
  if(chk){
    //add Clipping Plane and place its center either into the camera target
    //position or into the centre of the currently selected mesh node
    var centre=new Vector3();
    if(target){
      var trans=target.transform;
      var parent=target.parent;
      while(parent.transform){
        trans=trans.multiply(parent.transform);
        parent=parent.parent;
      }
      if(target.constructor.name=='Mesh'){
        var centre=trans.transformPosition(target.computeBoundingBox().center);
      }else{
        var centre=new Vector3(trans.translation);
      }
      target=null;
    }else{
      centre.set(scene.cameras.getByIndex(0).targetPosition);
    }
    clip.transform.setView(
      new Vector3(0,0,0), new Vector3(1,0,0), new Vector3(0,1,0));
    clip.transform.translateInPlace(centre);
  }else{
    if(
      scene.nodes.getByName('$$$$$$')||
      scene.nodes.getByName('Clipping Plane')
    ){
      clip.remove();clip=null;
    }
  }
  restoreTrans(curTrans);
  return clip;
}

//function to store current transformation matrix of all nodes in the scene
function getCurTrans() {
  var tA=new Array();
  for(var i=0; i<scene.nodes.count; i++){
    var nd=scene.nodes.getByIndex(i);
    if(nd.name=='') continue;
    tA[nd.name]=new Matrix4x4(nd.transform);
  }
  return tA;
}

//function to restore transformation matrices given as arg
function restoreTrans(tA) {
  for(var i=0; i<scene.nodes.count; i++){
    var nd=scene.nodes.getByIndex(i);
    if(tA[nd.name]) nd.transform.set(tA[nd.name]);
  }
}

//store original transformation matrix of all mesh nodes in the scene
var origtrans=getCurTrans();

//set initial state of "Cross Section" menu entry
cameraEventHandler.onEvent(1);

//host.console.clear();