diff --git a/ai_001_004/background_mesh/1.obj b/ai_001_004/background_mesh/1.obj
new file mode 100644
index 0000000000000000000000000000000000000000..0e04210ae376049eaa0d987edcf4de0b36cdb10e
--- /dev/null
+++ b/ai_001_004/background_mesh/1.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.49752474 0.31207919 -0.00040865
+v 2.49787998 0.30305293 -2.53225994
+v 2.49832964 -4.49888706 -2.53226256
+v 2.49797535 -4.50207996 -0.00032887
+vt 0.00003150 1.00000000
+vt 0.99999887 0.99812502
+vt 1.00000000 0.00066323
+vt 0.00000000 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/10.obj b/ai_001_004/background_mesh/10.obj
new file mode 100644
index 0000000000000000000000000000000000000000..e09a2b56cc04338d70275e0aa05a1d71081d0884
--- /dev/null
+++ b/ai_001_004/background_mesh/10.obj
@@ -0,0 +1,26 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.00202465 0.49435094 -2.20249796
+v 3.98306441 0.49435484 -2.20250249
+v 3.99725795 0.46596774 -2.20250201
+v 4.01145172 0.49435484 -2.20250249
+v 4.80042553 0.49435297 -2.20250654
+v 4.80038643 0.32403040 -2.20250273
+v 4.79209661 0.30305162 -2.20250201
+v 3.01790333 0.30305284 -2.20249343
+vt 0.00000000 0.99997962
+vt 0.54550672 1.00000000
+vt 0.55339903 0.85161203
+vt 0.56129146 1.00000000
+vt 1.00000000 0.99999017
+vt 0.99997824 0.10966244
+vt 0.99536872 0.00000000
+vt 0.00882933 0.00000639
+f 8/8 2/2 3/3
+f 7/7 4/4 5/5
+f 5/5 6/6 7/7
+f 2/2 8/8 1/1
+f 4/4 7/7 3/3
+f 8/8 3/3 7/7
+
diff --git a/ai_001_004/background_mesh/11.obj b/ai_001_004/background_mesh/11.obj
new file mode 100644
index 0000000000000000000000000000000000000000..7e8f43c43c4bb33d6d5cd113e3f18362dbda1dc9
--- /dev/null
+++ b/ai_001_004/background_mesh/11.obj
@@ -0,0 +1,60 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.55896616 1.28302526 -2.54483938
+v 2.57816744 1.28302336 -2.60353041
+v 2.57814598 0.32604194 -2.60345268
+v 2.57163239 0.30305287 -2.58354282
+v 2.57814455 0.26495790 -2.60344768
+v 2.57811236 -1.16033399 -2.60333204
+v 2.57163715 -1.19866431 -2.58353949
+v 2.57811117 -1.22141790 -2.60332704
+v 2.57808113 -2.54490495 -2.60321951
+v 2.56531143 -2.59992647 -2.56418657
+v 2.57807946 -2.62634826 -2.60321283
+v 2.57803941 -4.39778233 -2.60306907
+v 2.56264067 -4.43837881 -2.55600047
+v 2.56094980 -4.43995237 -2.55083251
+v 2.57263350 -4.42907715 -2.58654475
+v 2.57803798 -4.45886660 -2.60306406
+v 2.57164955 -4.49886703 -2.58353686
+v 2.57803679 -4.51995087 -2.60305905
+v 2.57801604 -5.43621111 -2.60298467
+v 2.55899048 -5.43620777 -2.54483104
+vt 0.00000597 1.00000000
+vt 1.00000000 0.99999970
+vt 0.99869567 0.85757554
+vt 0.65946639 0.85415423
+vt 0.99861139 0.84848464
+vt 0.99666971 0.63636351
+vt 0.65943909 0.63065898
+vt 0.99658656 0.62727267
+vt 0.99478042 0.43030280
+vt 0.32972768 0.42211413
+vt 0.99466920 0.41818187
+vt 0.99225485 0.15454565
+vt 0.19028784 0.14850383
+vt 0.10223405 0.14826964
+vt 0.71070981 0.14988816
+vt 0.99217057 0.14545470
+vt 0.65946108 0.13950157
+vt 0.99208754 0.13636374
+vt 0.99083823 0.00000000
+vt 0.00000000 0.00000050
+f 1/1 2/2 3/3
+f 4/4 5/5 6/6
+f 7/7 8/8 9/9
+f 10/10 11/11 12/12
+f 1/1 3/3 4/4
+f 4/4 6/6 7/7
+f 7/7 9/9 10/10
+f 10/10 12/12 13/13
+f 1/1 4/4 7/7
+f 10/10 13/13 1/1
+f 1/1 7/7 10/10
+f 14/14 15/15 16/16
+f 20/20 18/18 19/19
+f 17/17 20/20 14/14
+f 14/14 16/16 17/17
+f 18/18 20/20 17/17
+
diff --git a/ai_001_004/background_mesh/12.obj b/ai_001_004/background_mesh/12.obj
new file mode 100644
index 0000000000000000000000000000000000000000..cafac26ca7c4edb2efedff109befbc0f7ac7a1ae
--- /dev/null
+++ b/ai_001_004/background_mesh/12.obj
@@ -0,0 +1,45 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 7.09998131 0.30648577 -0.00045968
+v 7.09998608 0.30304977 -2.49208570
+v 7.09999990 -1.19863391 -2.49208570
+v 7.09999514 -1.19568563 -0.00043479
+v 7.10001469 -2.85374284 -2.49208570
+v 7.10001135 -2.48528576 -2.49208570
+v 7.10001135 -2.47111416 -2.40705705
+v 7.10001135 -2.47111297 -2.20244884
+v 7.10001230 -2.61282897 -2.20244551
+v 7.10001183 -2.61284757 -1.91625285
+v 7.10000849 -2.59993529 -0.22465694
+v 7.10000706 -2.45694304 -0.25299990
+v 7.10000658 -2.45694232 -0.00041389
+v 7.10001707 -3.57648563 -0.00039534
+v 7.10002136 -3.57648563 -2.49208570
+vt 0.00002584 1.00000000
+vt 1.00000000 0.99911511
+vt 1.00000000 0.61237937
+vt 0.00001584 0.61313868
+vt 1.00000000 0.18613137
+vt 1.00000000 0.28102186
+vt 0.96587509 0.28467155
+vt 0.88375890 0.28467184
+vt 0.88375753 0.24817505
+vt 0.76889873 0.24817026
+vt 0.09000382 0.25149563
+vt 0.10137881 0.28832111
+vt 0.00000746 0.28832129
+vt 0.00000000 0.00000000
+vt 1.00000000 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+f 10/10 14/14 11/11
+f 11/11 13/13 12/12
+f 9/9 8/8 7/7
+f 7/7 6/6 5/5
+f 13/13 11/11 14/14
+f 9/9 7/7 5/5
+f 14/14 10/10 15/15
+f 10/10 9/9 5/5
+f 15/15 10/10 5/5
+
diff --git a/ai_001_004/background_mesh/13.obj b/ai_001_004/background_mesh/13.obj
new file mode 100644
index 0000000000000000000000000000000000000000..e8a12c2f021cfb94835cecc3004e5c781e862deb
--- /dev/null
+++ b/ai_001_004/background_mesh/13.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 1.50316906 1.41325843 -0.05455065
+v 1.50317383 1.41325843 -2.53207874
+v 1.50317597 1.18674159 -2.53207874
+v 1.50317121 1.18674183 -0.00041210
+v 1.50316930 1.39910185 -0.00041561
+vt 0.02138454 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000105
+vt 0.00000137 0.93750322
+f 1/1 2/2 3/3
+f 1/1 4/4 5/5
+f 4/4 1/1 3/3
+
diff --git a/ai_001_004/background_mesh/14.obj b/ai_001_004/background_mesh/14.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2285a3d223a585f7797e8586a83c7388a1a9b47a
--- /dev/null
+++ b/ai_001_004/background_mesh/14.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 7.09999657 -1.19856572 -0.82791674
+v 7.09999895 -1.19861507 -2.03208351
+v 6.79958153 -1.19861686 -2.03208351
+v 6.79958296 -1.19856751 -0.82791668
+vt 0.00000005 0.99999207
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000476
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/15.obj b/ai_001_004/background_mesh/15.obj
new file mode 100644
index 0000000000000000000000000000000000000000..f673d32ef32348a3c607213e0d1f5f0339165ba4
--- /dev/null
+++ b/ai_001_004/background_mesh/15.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 0.30443278 2.50736952 -0.28832614
+v 0.30447137 2.50728154 -2.43704152
+v -0.00221048 2.50727987 -2.43704128
+v -0.00221048 2.50737262 -0.17295885
+v 0.30443069 2.50737429 -0.17295802
+vt 0.05095578 0.99987406
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000037 0.00000000
+vt 0.00000000 0.99986726
+f 1/1 2/2 3/3
+f 1/1 4/4 5/5
+f 4/4 1/1 3/3
+
diff --git a/ai_001_004/background_mesh/16.obj b/ai_001_004/background_mesh/16.obj
new file mode 100644
index 0000000000000000000000000000000000000000..253068de2a6b8c28afd4b5c29a3c52aed7c2498b
--- /dev/null
+++ b/ai_001_004/background_mesh/16.obj
@@ -0,0 +1,72 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 5.70114613 3.70432663 0.00359583
+v 5.70096684 3.70435238 -2.61359596
+v 2.58225250 3.70441675 -2.61604548
+v 2.49757290 3.70441866 -2.61359692
+v 2.49756503 3.70441818 -2.55700493
+v 2.46241283 3.70441914 -2.60372019
+v 2.20776629 3.70442438 -2.60370564
+v 2.19362211 3.70441628 -1.72233593
+v 2.20776892 3.70441532 -1.63745403
+v 2.25266004 3.70441341 -1.60862064
+v 2.16068101 3.70441270 -1.32747912
+v 2.20776892 3.70441198 -1.29792655
+v 2.20776892 3.70439982 -0.08128607
+v 2.49721837 3.70439363 -0.08128512
+v 2.49070859 3.70439291 -0.00046479
+v 0.66574812 3.70443058 -0.00044451
+v 1.99556446 3.70440316 -0.00045929
+v 2.00576663 3.70441008 -0.71790028
+v 1.96319926 3.70441079 -0.72386062
+v 1.97574186 3.70441079 -0.76219797
+v 2.00576663 3.70441031 -0.76034123
+v 1.99556494 3.70442867 -2.60369325
+v 0.29792619 3.70446372 -2.60359526
+v 0.29792643 3.70443821 -0.00044043
+vt 0.00000000 1.00000000
+vt 0.99906492 0.99996680
+vt 1.00000000 0.42277128
+vt 0.99906528 0.40709922
+vt 0.97746235 0.40709776
+vt 0.99529505 0.40059197
+vt 0.99528950 0.35346332
+vt 0.65884280 0.35084558
+vt 0.62644064 0.35346380
+vt 0.61543405 0.36177200
+vt 0.50811344 0.34474900
+vt 0.49683228 0.35346380
+vt 0.03240211 0.35346380
+vt 0.03240174 0.40703359
+vt 0.00155007 0.40582880
+vt 0.00154233 0.06807458
+vt 0.00154798 0.31419009
+vt 0.27541789 0.31607828
+vt 0.27769315 0.30820012
+vt 0.29232773 0.31052142
+vt 0.29161894 0.31607828
+vt 0.99528474 0.31419018
+vt 0.99524736 0.00000000
+vt 0.00154079 0.00000004
+f 10/10 2/2 3/3
+f 3/3 4/4 5/5
+f 5/5 6/6 7/7
+f 10/10 8/8 9/9
+f 10/10 11/11 12/12
+f 12/12 13/13 14/14
+f 14/14 15/15 1/1
+f 10/10 3/3 5/5
+f 8/8 5/5 7/7
+f 1/1 12/12 14/14
+f 2/2 10/10 1/1
+f 8/8 10/10 5/5
+f 12/12 1/1 10/10
+f 19/19 17/17 18/18
+f 20/20 21/21 22/22
+f 16/16 23/23 24/24
+f 17/17 19/19 16/16
+f 23/23 20/20 22/22
+f 20/20 16/16 19/19
+f 16/16 20/20 23/23
+
diff --git a/ai_001_004/background_mesh/17.obj b/ai_001_004/background_mesh/17.obj
new file mode 100644
index 0000000000000000000000000000000000000000..f43d6f1e4c82cf98810f769b4049096bf3abdffd
--- /dev/null
+++ b/ai_001_004/background_mesh/17.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 5.70104074 3.70434165 -1.53285706
+v 5.70114231 3.69206381 -0.00050025
+v 5.70072746 1.89793646 -0.00047051
+v 5.70062160 1.89793611 -1.53285718
+vt 0.00000008 1.00000000
+vt 0.99998063 0.99320316
+vt 1.00000000 0.00000020
+vt 0.00000000 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/18.obj b/ai_001_004/background_mesh/18.obj
new file mode 100644
index 0000000000000000000000000000000000000000..86e86a17f0ad884ea8a49d99af52ec83c80760d0
--- /dev/null
+++ b/ai_001_004/background_mesh/18.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 4.80047703 0.49208355 -1.43541813
+v 4.80057573 0.49208438 -0.00043722
+v 4.80053329 0.30791664 -0.00043416
+v 4.80043364 0.30305225 -1.43541813
+vt 0.00000000 0.99999559
+vt 0.99999785 1.00000000
+vt 1.00000000 0.02573312
+vt 0.00000000 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/19.obj b/ai_001_004/background_mesh/19.obj
new file mode 100644
index 0000000000000000000000000000000000000000..8f411ff28adfd65b309301d5952365c969cd2066
--- /dev/null
+++ b/ai_001_004/background_mesh/19.obj
@@ -0,0 +1,23 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 7.79809475 -4.42400312 -2.60336781
+v 7.79809570 -4.44192600 -2.54451442
+v 1.56190467 -4.44187164 -2.54449821
+v 1.56190228 -4.42405367 -2.60300779
+v 2.53890681 -4.42404604 -2.60306430
+v 2.57080197 -4.43078184 -2.58094668
+v 2.60126853 -4.42404556 -2.60306787
+vt 0.00000000 0.99999982
+vt 1.00000000 1.00000000
+vt 0.99999475 0.00000038
+vt 0.00583726 0.00000000
+vt 0.00492253 0.15666680
+vt 0.38073230 0.16178133
+vt 0.00486467 0.16666678
+f 6/6 2/2 3/3
+f 3/3 4/4 5/5
+f 2/2 7/7 1/1
+f 3/3 5/5 6/6
+f 7/7 2/2 6/6
+
diff --git a/ai_001_004/background_mesh/2.obj b/ai_001_004/background_mesh/2.obj
new file mode 100644
index 0000000000000000000000000000000000000000..6829027da60b020e88aa01fbb84b3d029e598d4d
--- /dev/null
+++ b/ai_001_004/background_mesh/2.obj
@@ -0,0 +1,140 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 0.30434600 3.96207380 -2.60361671
+v 2.00576305 3.96207666 -2.60371494
+v 2.00576305 3.96207619 -2.60371494
+v 7.09995317 3.96207666 -2.60400891
+v 7.10002995 -4.40207672 -2.60332942
+v 7.07207680 -4.42400885 -2.60332608
+v 6.79966354 -4.40207624 -2.60331202
+v 6.77487278 -4.42401171 -2.60330892
+v 6.02478790 -4.42401743 -2.60326552
+v 6.00141621 -4.40207672 -2.60326600
+v 5.72758484 -4.42401981 -2.60324836
+v 5.69909334 -4.40207434 -2.60324883
+v 5.67097473 -4.42402029 -2.60324502
+v 4.82182217 -4.42402744 -2.60319614
+v 4.79926634 -4.40207529 -2.60319662
+v 4.76521206 -4.42402792 -2.60319281
+v 3.02444911 -4.42404175 -2.60309219
+v 3.00246429 -4.40207481 -2.60309291
+v 2.61402535 -4.42404509 -2.60306859
+v 2.57803941 -4.40207624 -2.60306859
+v 2.52911019 -4.42404604 -2.60306358
+v 2.49833059 -4.40207577 -2.60306382
+v 2.47250009 -4.42404652 -2.60306048
+v 2.03377128 -4.42404985 -2.60303521
+v 2.00581169 -4.40207672 -2.60303545
+v 1.97716093 -4.42405033 -2.60303187
+v 1.53843188 -4.42405415 -2.60300660
+v 1.50322771 -4.40207672 -2.60300636
+v 1.46766925 -4.42405462 -2.60300231
+v 0.33546594 -4.42406368 -2.60293698
+v 0.30508280 -4.38792706 -2.60293841
+v 0.30492795 -2.63301158 -2.60308099
+v 0.33546567 -2.59991765 -2.60308552
+v 0.30492172 -2.56224895 -2.60308671
+v 0.30480433 -1.23190987 -2.60319471
+v 0.33546591 -1.19867826 -2.60319924
+v 0.30479807 -1.16114724 -2.60320044
+v 0.30467194 0.26825982 -2.60331655
+v 0.33546567 0.30305439 -2.60332108
+v 0.30466571 0.33902255 -2.60332251
+v 0.30447713 2.47605658 -2.60349607
+v 0.33546567 2.50727463 -2.60350013
+v 0.30447090 2.54681945 -2.60350180
+v 0.30437222 3.66487002 -2.60359263
+v 0.36377093 3.70446229 -2.60359907
+v 0.30436599 3.73563313 -2.60359836
+vt 0.00000000 0.99999964
+vt 0.25036728 1.00000000
+vt 0.25036728 0.99999988
+vt 0.99998868 1.00000000
+vt 1.00000000 0.00262182
+vt 0.99588662 0.00000654
+vt 0.95580041 0.00262188
+vt 0.95215237 0.00000620
+vt 0.84177572 0.00000552
+vt 0.83833653 0.00262182
+vt 0.79804164 0.00000523
+vt 0.79384905 0.00262211
+vt 0.78971136 0.00000517
+vt 0.66475666 0.00000432
+vt 0.66143751 0.00262199
+vt 0.65642637 0.00000426
+vt 0.40026921 0.00000262
+vt 0.39703411 0.00262205
+vt 0.33987445 0.00000222
+vt 0.33457902 0.00262188
+vt 0.32737899 0.00000210
+vt 0.32284969 0.00262193
+vt 0.31904867 0.00000205
+vt 0.25448877 0.00000165
+vt 0.25037444 0.00262182
+vt 0.24615842 0.00000159
+vt 0.18159847 0.00000114
+vt 0.17641810 0.00262182
+vt 0.17118560 0.00000108
+vt 0.00457935 0.00000000
+vt 0.00010841 0.00430909
+vt 0.00008560 0.21357286
+vt 0.00457932 0.21751913
+vt 0.00008469 0.22201091
+vt 0.00006743 0.38064635
+vt 0.00457935 0.38460901
+vt 0.00006652 0.38908440
+vt 0.00004796 0.55953312
+vt 0.00457932 0.56368214
+vt 0.00004705 0.56797117
+vt 0.00001930 0.82280046
+vt 0.00457932 0.82652301
+vt 0.00001838 0.83123851
+vt 0.00000386 0.96455973
+vt 0.00874450 0.96928084
+vt 0.00000295 0.97299778
+f 45/45 2/2 3/3
+f 7/7 4/4 5/5
+f 5/5 6/6 7/7
+f 10/10 8/8 9/9
+f 10/10 11/11 12/12
+f 15/15 13/13 14/14
+f 18/18 16/16 17/17
+f 18/18 19/19 20/20
+f 20/20 21/21 22/22
+f 22/22 23/23 24/24
+f 25/25 26/26 27/27
+f 31/31 29/29 30/30
+f 29/29 31/31 32/32
+f 36/36 34/34 35/35
+f 39/39 37/37 38/38
+f 42/42 40/40 41/41
+f 45/45 43/43 44/44
+f 45/45 46/46 1/1
+f 10/10 4/4 7/7
+f 8/8 10/10 7/7
+f 13/13 15/15 12/12
+f 16/16 18/18 15/15
+f 33/33 20/20 22/22
+f 22/22 24/24 25/25
+f 25/25 27/27 28/28
+f 29/29 32/32 28/28
+f 34/34 36/36 33/33
+f 37/37 39/39 36/36
+f 40/40 42/42 39/39
+f 43/43 45/45 42/42
+f 2/2 45/45 1/1
+f 39/39 4/4 15/15
+f 36/36 15/15 18/18
+f 33/33 25/25 28/28
+f 28/28 32/32 33/33
+f 3/3 39/39 42/42
+f 3/3 42/42 45/45
+f 4/4 39/39 3/3
+f 25/25 33/33 22/22
+f 20/20 36/36 18/18
+f 12/12 4/4 10/10
+f 36/36 20/20 33/33
+f 15/15 4/4 12/12
+f 39/39 15/15 36/36
+
diff --git a/ai_001_004/background_mesh/20.obj b/ai_001_004/background_mesh/20.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c9ad55722905bc9f572bbf8977ff5f62702a156d
--- /dev/null
+++ b/ai_001_004/background_mesh/20.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.00576544 4.01214266 -0.00046450
+v 2.00576282 4.01214504 -2.60371900
+v 2.00576448 3.74071622 -2.60369682
+v 2.00576448 3.70442867 -2.62642980
+v 2.00576735 3.69785714 -0.00045929
+vt 0.00000200 0.99999243
+vt 0.99135149 1.00000000
+vt 0.99134308 0.13636884
+vt 1.00000000 0.02090927
+vt 0.00000000 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 5/5
+f 5/5 1/1 3/3
+
diff --git a/ai_001_004/background_mesh/21.obj b/ai_001_004/background_mesh/21.obj
new file mode 100644
index 0000000000000000000000000000000000000000..79c06ec5779c8d1f5f6ab2b4b29b9492f476de45
--- /dev/null
+++ b/ai_001_004/background_mesh/21.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 6.00146151 1.20289624 -0.00046234
+v 6.00144768 1.20289612 -2.60372138
+v 6.00144291 0.29710370 -2.60364771
+v 6.00145674 0.29710379 -0.00044733
+vt 0.00000577 1.00000000
+vt 1.00000000 0.99999988
+vt 0.99997169 0.00000000
+vt 0.00000000 0.00000010
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/3.obj b/ai_001_004/background_mesh/3.obj
new file mode 100644
index 0000000000000000000000000000000000000000..fd118e6075282d7616aa54ba8f7c6d7b4a003f14
--- /dev/null
+++ b/ai_001_004/background_mesh/3.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 7.09994745 3.96667719 -0.00052034
+v 0.30429882 3.96667671 -0.00044485
+v 0.30504653 -4.50667763 -0.00030444
+v 7.11207485 -4.49820948 -0.00038020
+vt 0.00178140 1.00000000
+vt 1.00000000 1.00000000
+vt 0.99989015 0.00000000
+vt 0.00000000 0.00099939
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_001_004/background_mesh/4.obj b/ai_001_004/background_mesh/4.obj
new file mode 100644
index 0000000000000000000000000000000000000000..b7290ba51bd32123d32d28d651a8e1ca8fef190f
--- /dev/null
+++ b/ai_001_004/background_mesh/4.obj
@@ -0,0 +1,20 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 6.79966640 -4.49801779 -2.53208113
+v 6.80399227 -4.49827194 -0.00037677
+v 2.48600936 -4.49914455 -0.00032879
+v 2.49829388 -4.49891281 -2.27724767
+v 2.47703600 -4.49891520 -2.29434252
+v 2.49832964 -4.49888706 -2.53208351
+vt 0.00000092 0.99900037
+vt 0.99998105 1.00000000
+vt 1.00000000 0.00207380
+vt 0.10065582 0.00491289
+vt 0.09390365 0.00000000
+vt 0.00000000 0.00492116
+f 4/4 2/2 3/3
+f 4/4 5/5 6/6
+f 2/2 4/4 1/1
+f 4/4 6/6 1/1
+
diff --git a/ai_001_004/background_mesh/5.obj b/ai_001_004/background_mesh/5.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a869a79411644ba2e47106a7e9f1c03b166982ab
--- /dev/null
+++ b/ai_001_004/background_mesh/5.obj
@@ -0,0 +1,54 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 6.79954195 0.30304989 -2.61206532
+v 6.79954529 0.28804374 -0.00045604
+v 6.79958868 -1.37934709 -0.00042841
+v 6.79958582 -1.36521733 -0.16750014
+v 6.79958344 -1.26630425 -0.18163049
+v 6.79958296 -1.26630425 -0.36532617
+v 6.79958344 -1.19854856 -0.36532724
+v 6.79958153 -1.19565701 -1.92104757
+v 6.79958153 -1.19861746 -2.04684949
+v 6.79958105 -1.26630425 -2.04684782
+v 6.79958105 -1.26630425 -2.31532621
+v 6.79958296 -1.33695650 -2.31532621
+v 6.79958582 -1.37934947 -2.60355759
+v 6.79961729 -2.59994292 -2.34358692
+v 6.79961729 -2.60869598 -2.60345769
+v 6.79966640 -4.49800968 -2.61206484
+v 6.79966927 -4.50217342 -0.00037666
+v 6.79962015 -2.60869551 -0.00040804
+vt 0.00000000 1.00000000
+vt 0.99996960 0.99687713
+vt 0.99998021 0.64988160
+vt 0.93600947 0.65282214
+vt 0.93059897 0.67340660
+vt 0.86026305 0.67340660
+vt 0.86026257 0.68750703
+vt 0.26458657 0.68810874
+vt 0.21641777 0.68749267
+vt 0.21641842 0.67340660
+vt 0.11361963 0.67340660
+vt 0.11361963 0.65870339
+vt 0.00325756 0.64988112
+vt 0.10279877 0.39586723
+vt 0.00329581 0.39404565
+vt 0.00000018 0.00086650
+vt 1.00000000 0.00000000
+vt 0.99998796 0.39404577
+f 5/5 2/2 3/3
+f 3/3 4/4 5/5
+f 5/5 6/6 7/7
+f 9/9 10/10 11/11
+f 11/11 12/12 13/13
+f 7/7 2/2 5/5
+f 11/11 13/13 1/1
+f 8/8 2/2 7/7
+f 9/9 11/11 1/1
+f 2/2 8/8 1/1
+f 8/8 9/9 1/1
+f 14/14 18/18 17/17
+f 14/14 16/16 15/15
+f 16/16 14/14 17/17
+
diff --git a/ai_001_004/background_mesh/6.obj b/ai_001_004/background_mesh/6.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ae722caf307a5162a677bcd681a12e9d939d06be
--- /dev/null
+++ b/ai_001_004/background_mesh/6.obj
@@ -0,0 +1,38 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 7.12483597 -2.59994531 -2.60347748
+v 7.10001278 -2.59994507 -2.57377052
+v 7.10001230 -2.59994411 -2.33316946
+v 7.12483597 -2.59994364 -2.20244622
+v 7.09652996 -2.59994364 -2.20244598
+v 7.10001183 -2.59994245 -1.95103836
+v 7.12485838 -2.59994221 -1.91632557
+v 7.10001183 -2.59994221 -1.89442635
+v 7.10000801 -2.59993434 -0.02622938
+v 7.12483597 -2.59993434 -0.00041180
+v 6.79962015 -2.59993315 0.00207663
+v 6.78516388 -2.59994388 -2.60345793
+vt 0.00000000 0.99993402
+vt 0.01140140 0.92685896
+vt 0.10374301 0.92685759
+vt 0.15391400 0.99993402
+vt 0.15391409 0.91660619
+vt 0.25040323 0.92685616
+vt 0.26372582 1.00000000
+vt 0.27213064 0.92685616
+vt 0.98913628 0.92684495
+vt 0.99904495 0.99993402
+vt 1.00000000 0.04255668
+vt 0.00000750 0.00000000
+f 3/3 4/4 5/5
+f 6/6 7/7 8/8
+f 9/9 10/10 11/11
+f 12/12 1/1 2/2
+f 12/12 3/3 5/5
+f 12/12 8/8 11/11
+f 8/8 9/9 11/11
+f 3/3 12/12 2/2
+f 8/8 12/12 6/6
+f 6/6 12/12 5/5
+
diff --git a/ai_001_004/background_mesh/7.obj b/ai_001_004/background_mesh/7.obj
new file mode 100644
index 0000000000000000000000000000000000000000..cabdd3195726f5fdbf6d9ef82fde9749feed7d0f
--- /dev/null
+++ b/ai_001_004/background_mesh/7.obj
@@ -0,0 +1,26 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 6.00145626 0.30305257 0.00206506
+v 6.00144243 0.30305046 -2.61206532
+v 2.49789119 0.30305287 -2.61206532
+v 2.49752522 0.30305499 0.00206506
+v 3.00200248 0.30305466 -0.01206517
+v 3.00204206 0.30305287 -2.21641302
+v 4.80038023 0.30305162 -2.21641397
+v 4.80053186 0.30305341 0.00206506
+vt 0.00000000 1.00000000
+vt 1.00000000 0.99999607
+vt 1.00000000 0.00010445
+vt 0.00000000 0.00000000
+vt 0.00540533 0.14397466
+vt 0.84864861 0.14398596
+vt 0.84864897 0.65722042
+vt 0.00000000 0.65726370
+f 6/6 4/4 5/5
+f 7/7 8/8 1/1
+f 4/4 6/6 3/3
+f 7/7 1/1 2/2
+f 7/7 3/3 6/6
+f 3/3 7/7 2/2
+
diff --git a/ai_001_004/background_mesh/8.obj b/ai_001_004/background_mesh/8.obj
new file mode 100644
index 0000000000000000000000000000000000000000..0430a8f8b2ae407397a814ee45c3e3c706a5e9c9
--- /dev/null
+++ b/ai_001_004/background_mesh/8.obj
@@ -0,0 +1,72 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 0.30432129 3.71208358 -0.00044063
+v 0.30436894 3.70446396 -2.61541653
+v 0.30451933 1.99791312 -2.60345721
+v 0.30451596 1.99791670 -2.41708326
+v 0.30447102 2.50728226 -2.41708493
+v 0.30446744 2.50729060 -2.21875048
+v 0.30446962 2.47958302 -2.20253086
+v 0.30446643 2.50729275 -2.16208458
+v 0.30446261 2.50730157 -1.94958389
+v 0.30446464 2.47951007 -1.92743421
+v 0.30446160 2.50730395 -1.89291787
+v 0.30443132 2.50737286 -0.20708489
+v 0.30447626 1.99791670 -0.20708323
+v 0.30447254 1.99791658 -0.00041222
+v 0.30446100 2.18208337 -0.26374996
+v 0.30444828 2.32375002 -0.24958324
+v 0.30445179 2.30958343 -0.37708324
+v 0.30445084 2.33791685 -0.46208328
+v 0.30445385 2.30958343 -0.49041659
+v 0.30445388 2.33791685 -0.63208324
+v 0.30445665 2.30958343 -0.64624995
+v 0.30448794 2.30958343 -2.38875008
+v 0.30451518 1.99791670 -2.37458324
+v 0.30447727 1.99791670 -0.26374996
+vt 0.00001085 1.00000000
+vt 1.00000000 0.99555492
+vt 0.99542665 0.00000000
+vt 0.92415565 0.00000209
+vt 0.92415631 0.29715198
+vt 0.84831148 0.29715684
+vt 0.84210896 0.28099301
+vt 0.82664198 0.29715809
+vt 0.74537992 0.29716325
+vt 0.73690969 0.28095043
+vt 0.72371036 0.29716462
+vt 0.07903340 0.29720482
+vt 0.07903276 0.00000209
+vt 0.00000000 0.00000202
+vt 0.10070260 0.10743987
+vt 0.09528513 0.19008431
+vt 0.14404222 0.18181990
+vt 0.17654696 0.19834885
+vt 0.18738186 0.18181990
+vt 0.24155639 0.19834885
+vt 0.24697387 0.18181990
+vt 0.91332084 0.18181990
+vt 0.90790331 0.00000209
+vt 0.10070260 0.00000209
+f 5/5 3/3 4/4
+f 6/6 7/7 8/8
+f 9/9 10/10 11/11
+f 12/12 13/13 14/14
+f 3/3 5/5 2/2
+f 2/2 8/8 9/9
+f 12/12 14/14 1/1
+f 6/6 2/2 5/5
+f 2/2 11/11 1/1
+f 11/11 12/12 1/1
+f 8/8 2/2 6/6
+f 11/11 2/2 9/9
+f 15/15 16/16 17/17
+f 17/17 18/18 19/19
+f 19/19 20/20 21/21
+f 21/21 22/22 23/23
+f 19/19 24/24 15/15
+f 15/15 17/17 19/19
+f 24/24 21/21 23/23
+f 21/21 24/24 19/19
+
diff --git a/ai_001_004/background_mesh/9.obj b/ai_001_004/background_mesh/9.obj
new file mode 100644
index 0000000000000000000000000000000000000000..05267c1570c8cdc99be974d249c7ef4021b56289
--- /dev/null
+++ b/ai_001_004/background_mesh/9.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.00198579 0.51214284 -0.11214262
+v 3.00202322 0.51214176 -2.20249844
+v 3.00204229 0.30305284 -2.22642899
+v 3.00200272 0.29785708 -0.00041402
+v 3.00198507 0.49785781 -0.00041733
+vt 0.05019221 1.00000000
+vt 0.98924959 0.99999499
+vt 1.00000000 0.02424690
+vt 0.00000000 0.00000000
+vt 0.00000150 0.93333656
+f 1/1 2/2 3/3
+f 1/1 4/4 5/5
+f 4/4 1/1 3/3
+
diff --git a/ai_001_004/background_mesh/albedo_1.png b/ai_001_004/background_mesh/albedo_1.png
new file mode 100644
index 0000000000000000000000000000000000000000..23846e96de8d4b74d4622a49dd0cf975fe534ade
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_1.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8db127ed6a2109f9664add145155bdce3be4ddb22a162932b9c7194cb86387aa
+size 979986
diff --git a/ai_001_004/background_mesh/albedo_10.png b/ai_001_004/background_mesh/albedo_10.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_10.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_11.png b/ai_001_004/background_mesh/albedo_11.png
new file mode 100644
index 0000000000000000000000000000000000000000..565b9c2e26fbfa8af04e1ca758f989ac79d72482
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_11.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9ed3341e8d5d6b6fff0522073cc06f3dead72b06c2a27e2bcc64f9efd49bdb45
+size 1666336
diff --git a/ai_001_004/background_mesh/albedo_12.png b/ai_001_004/background_mesh/albedo_12.png
new file mode 100644
index 0000000000000000000000000000000000000000..fd01bfd940511babc395735b3247ccc8cf07dd5b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_12.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9ee4e8ac3809eee005481fc242ff2c76f44691ec7e78ed46d5c12c45ca5dd2bf
+size 831592
diff --git a/ai_001_004/background_mesh/albedo_13.png b/ai_001_004/background_mesh/albedo_13.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_13.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_14.png b/ai_001_004/background_mesh/albedo_14.png
new file mode 100644
index 0000000000000000000000000000000000000000..43e130ef9045ecf4d094197125c8908e95276023
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_14.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6de9c51750722396859cc45ce7bf4e82e4459688375f3e7795129cee74bfdf07
+size 1193448
diff --git a/ai_001_004/background_mesh/albedo_15.png b/ai_001_004/background_mesh/albedo_15.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_15.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_16.png b/ai_001_004/background_mesh/albedo_16.png
new file mode 100644
index 0000000000000000000000000000000000000000..0da323cb1fe1472350692a2f37823feef6ab039c
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_16.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5ac66046e675ef95c935d8067b1307dbd3096f38e3948ba67875df16fab31b96
+size 1423169
diff --git a/ai_001_004/background_mesh/albedo_17.png b/ai_001_004/background_mesh/albedo_17.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_17.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_18.png b/ai_001_004/background_mesh/albedo_18.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_18.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_19.png b/ai_001_004/background_mesh/albedo_19.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_19.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_2.png b/ai_001_004/background_mesh/albedo_2.png
new file mode 100644
index 0000000000000000000000000000000000000000..8a5afe0aea0191ddf27b56dc0d703824dc30bffd
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_2.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d6b523d689596ae5c37b89c040d79044c7a33f7b9c941a989073b6d9b8143981
+size 1025121
diff --git a/ai_001_004/background_mesh/albedo_20.png b/ai_001_004/background_mesh/albedo_20.png
new file mode 100644
index 0000000000000000000000000000000000000000..e31c98f0a92af01d5a1a4ac4cf9795f96af2313b
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_20.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cae1d49e8118a7f8d1e00ec50d1757250d2d9de37c9488280f685f3c20ab3b53
+size 1484396
diff --git a/ai_001_004/background_mesh/albedo_21.png b/ai_001_004/background_mesh/albedo_21.png
new file mode 100644
index 0000000000000000000000000000000000000000..6997e4d0669350888d851955605ce45e5188cd2c
--- /dev/null
+++ b/ai_001_004/background_mesh/albedo_21.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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