diff --git a/ai_001_003/background_mesh/1.obj b/ai_001_003/background_mesh/1.obj
new file mode 100644
index 0000000000000000000000000000000000000000..8824b79ecd5178e134cf1d98bd7cb48e35f446d1
--- /dev/null
+++ b/ai_001_003/background_mesh/1.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.36769843 7.72107124 -0.00090519
+v -5.53392363 7.72107029 -0.00136420
+v -5.53384590 -0.62812400 -0.00162301
+v 3.36720133 -0.62812448 -0.00116403
+vt 0.00000000 1.00000000
+vt 1.00000000 0.99999988
+vt 0.99999130 0.00000006
+vt 0.00005582 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/10.obj b/ai_001_003/background_mesh/10.obj
new file mode 100644
index 0000000000000000000000000000000000000000..45e4129d4e6d18788b19fec382fec6295f7468f9
--- /dev/null
+++ b/ai_001_003/background_mesh/10.obj
@@ -0,0 +1,23 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.69118381 3.53966784 -1.08428562
+v 3.69120240 3.53969979 -0.25571427
+v 3.69117236 3.02785730 -0.25571436
+v 3.69117022 3.02784991 -0.34928846
+v 3.69119406 3.42785287 -0.34937441
+v 3.69119573 3.45411372 -0.32714170
+v 3.69117880 3.45418859 -1.08428884
+vt 0.00000388 0.99993759
+vt 1.00000000 1.00000000
+vt 0.99999994 0.00001444
+vt 0.88706607 0.00000000
+vt 0.88696235 0.78148490
+vt 0.91379482 0.83279067
+vt 0.00000000 0.83293694
+f 5/5 3/3 4/4
+f 3/3 5/5 6/6
+f 6/6 7/7 1/1
+f 3/3 6/6 2/2
+f 6/6 1/1 2/2
+
diff --git a/ai_001_003/background_mesh/11.obj b/ai_001_003/background_mesh/11.obj
new file mode 100644
index 0000000000000000000000000000000000000000..22d2d9b1fcdba735af9ebd6bea05c58af1fe434c
--- /dev/null
+++ b/ai_001_003/background_mesh/11.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.16872263 7.89250088 -2.87275124
+v 2.16873980 7.89250565 -2.09557033
+v 2.16873479 7.79674244 -2.06499863
+v 2.16871643 7.78749990 -2.87275004
+v 2.16871595 7.79671049 -2.90500116
+vt 0.03839266 0.99995458
+vt 0.96360523 1.00000000
+vt 1.00000000 0.08801933
+vt 0.03839407 0.00000000
+vt 0.00000000 0.08771507
+f 4/4 2/2 3/3
+f 1/1 4/4 5/5
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/12.obj b/ai_001_003/background_mesh/12.obj
new file mode 100644
index 0000000000000000000000000000000000000000..40eefd06d444e98f35a2195e786e0507ea0f8ba0
--- /dev/null
+++ b/ai_001_003/background_mesh/12.obj
@@ -0,0 +1,871 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
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new file mode 100644
index 0000000000000000000000000000000000000000..0b39acb115406a91797069e87cd43fd6b05ba37d
--- /dev/null
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diff --git a/ai_001_003/background_mesh/14.obj b/ai_001_003/background_mesh/14.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a4ad66e30a568b8b6a819df96152935bf60664f3
--- /dev/null
+++ b/ai_001_003/background_mesh/14.obj
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+# https://github.com/mikedh/trimesh
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new file mode 100644
index 0000000000000000000000000000000000000000..ccd1a747cba83d9c62759860fe5ec0930c16ad62
--- /dev/null
+++ b/ai_001_003/background_mesh/15.obj
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+# https://github.com/mikedh/trimesh
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diff --git a/ai_001_003/background_mesh/16.obj b/ai_001_003/background_mesh/16.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a3158af3283773d2cf4c4188ffa145a50586e77f
--- /dev/null
+++ b/ai_001_003/background_mesh/16.obj
@@ -0,0 +1,29 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.69117665 3.45419812 -1.17998171
+v 3.69115925 3.45427537 -1.95999956
+v 3.71500373 3.45427537 -2.00297952
+v 3.69115710 3.45428514 -2.06000185
+v 3.71500182 3.45428443 -2.09532452
+v 3.69115567 3.45429111 -2.12000322
+v 3.69114184 3.45435238 -2.74001789
+v 3.66733289 3.45435667 -2.74001765
+v 3.66736770 3.45420241 -1.17998207
+vt 0.00000000 0.50017506
+vt 0.49999985 0.49980998
+vt 0.52755046 1.00000000
+vt 0.56410241 0.49976498
+vt 0.58674461 0.99996006
+vt 0.60256392 0.49973497
+vt 1.00000000 0.49944490
+vt 0.99999982 0.00000000
+vt 0.00000023 0.00073024
+f 2/2 3/3 4/4
+f 4/4 5/5 6/6
+f 6/6 7/7 8/8
+f 2/2 9/9 1/1
+f 8/8 4/4 6/6
+f 2/2 8/8 9/9
+f 8/8 2/2 4/4
+
diff --git a/ai_001_003/background_mesh/17.obj b/ai_001_003/background_mesh/17.obj
new file mode 100644
index 0000000000000000000000000000000000000000..5db9965f2580b87e84c95df77513f12fb7bfec24
--- /dev/null
+++ b/ai_001_003/background_mesh/17.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.73342133 3.45410848 -0.34939030
+v 3.67657900 3.45411897 -0.34937647
+v 3.68492532 2.62789416 -0.34920102
+v 3.69119287 3.40947652 -0.34937048
+vt 0.00000000 0.99998730
+vt 1.00000000 1.00000000
+vt 0.85316789 0.00000000
+vt 0.74290526 0.94596815
+f 2/2 3/3 4/4
+f 4/4 1/1 2/2
+
diff --git a/ai_001_003/background_mesh/18.obj b/ai_001_003/background_mesh/18.obj
new file mode 100644
index 0000000000000000000000000000000000000000..f0c0d958ed3aec85f4e144a7328abd783aff22b1
--- /dev/null
+++ b/ai_001_003/background_mesh/18.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -5.53392315 7.70793343 0.00862598
+v -5.53398085 7.71741867 -3.20493436
+v -5.53396893 6.43789053 -3.20504117
+v -5.53391171 6.43789101 -0.00140398
+vt 0.00000000 0.99258691
+vt 0.99996674 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00312102 0.00000037
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/19.obj b/ai_001_003/background_mesh/19.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ca1af86c43fa33dae9c0c93628c41e859ccaff55
--- /dev/null
+++ b/ai_001_003/background_mesh/19.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -3.87280512 7.89480829 -2.09456229
+v -3.87280774 7.89480782 -2.48211527
+v -3.87280965 7.79768324 -2.48211527
+v -3.87280536 7.79769802 -2.09788465
+vt 0.00000000 1.00000000
+vt 1.00000000 0.99999511
+vt 1.00000000 0.00000000
+vt 0.00857267 0.00015220
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/2.obj b/ai_001_003/background_mesh/2.obj
new file mode 100644
index 0000000000000000000000000000000000000000..199791709e32c2987c9979214e03f5b402b99c6e
--- /dev/null
+++ b/ai_001_003/background_mesh/2.obj
@@ -0,0 +1,491 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.16788316 7.71877527 -3.20417166
+v 3.16794538 7.70654058 -0.38022244
+v 3.16794467 7.67629337 -0.35015973
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+v 3.16749120 -0.06883430 -0.00115699
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diff --git a/ai_001_003/background_mesh/20.obj b/ai_001_003/background_mesh/20.obj
new file mode 100644
index 0000000000000000000000000000000000000000..df1c5bd82e3d0c93e834be816bbab8854bb25b48
--- /dev/null
+++ b/ai_001_003/background_mesh/20.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
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diff --git a/ai_001_003/background_mesh/21.obj b/ai_001_003/background_mesh/21.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c014848a33f323b05a7ce507d586aa3388381fa8
--- /dev/null
+++ b/ai_001_003/background_mesh/21.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
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diff --git a/ai_001_003/background_mesh/22.obj b/ai_001_003/background_mesh/22.obj
new file mode 100644
index 0000000000000000000000000000000000000000..b53cb187c99a42225dcf88dcac435c253d4180bc
--- /dev/null
+++ b/ai_001_003/background_mesh/22.obj
@@ -0,0 +1,23 @@
+# https://github.com/mikedh/trimesh
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diff --git a/ai_001_003/background_mesh/23.obj b/ai_001_003/background_mesh/23.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2b664cbc26065fe193018f3762666e24a6ded484
--- /dev/null
+++ b/ai_001_003/background_mesh/23.obj
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+# https://github.com/mikedh/trimesh
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+
diff --git a/ai_001_003/background_mesh/24.obj b/ai_001_003/background_mesh/24.obj
new file mode 100644
index 0000000000000000000000000000000000000000..459b41c5cb2f05be90b3160a3a34b87839d24e25
--- /dev/null
+++ b/ai_001_003/background_mesh/24.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.99037480 -0.61724812 -2.98737001
+v 2.99059248 -0.60789454 -0.10930880
+v 2.99059129 -0.87829703 -0.10263097
+v 2.99037409 -0.89210540 -2.96662164
+vt 0.00000000 0.96708930
+vt 0.99768519 1.00000000
+vt 1.00000000 0.04858495
+vt 0.00719246 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/25.obj b/ai_001_003/background_mesh/25.obj
new file mode 100644
index 0000000000000000000000000000000000000000..b12f2ee29fae8e180fc8855a39cffde12e03c3fe
--- /dev/null
+++ b/ai_001_003/background_mesh/25.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.01100683 -0.61751026 -0.10930751
+v -0.01100945 -0.61767495 -0.10947487
+v -0.01100767 -0.87845999 -0.10947059
+v 2.99059033 -0.89296836 -0.10930412
+vt 0.00000000 1.00000000
+vt 1.00000000 0.99940211
+vt 0.99999946 0.05266996
+vt 0.00675592 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/26.obj b/ai_001_003/background_mesh/26.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c32ee0194befb082d5db6e8be7eb3a08c8276dcc
--- /dev/null
+++ b/ai_001_003/background_mesh/26.obj
@@ -0,0 +1,40 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.99037337 -0.87803370 -2.98206878
+v 2.99038076 -0.87804270 -2.88310313
+v 2.96552896 -0.87804508 -2.87274218
+v 2.99038196 -0.87804401 -2.86896539
+v 2.99380493 -0.87829626 -0.10930418
+v 0.06725264 -0.87845576 -0.10946626
+v 0.06725001 -0.87819439 -2.96631551
+v 1.24070048 -0.87813908 -2.87256145
+v 2.87512994 -0.87805164 -2.85482669
+v 2.87492108 -0.87829345 -0.21103442
+v 0.09552813 -0.87844610 -0.19794549
+v 0.09552550 -0.87820148 -2.87244153
+vt 0.00000000 0.99882746
+vt 0.03444962 0.99882996
+vt 0.03805623 0.99033815
+vt 0.03937092 0.99883038
+vt 1.00000000 1.00000000
+vt 0.99994355 0.00000090
+vt 0.00548366 0.00000000
+vt 0.03811914 0.40096650
+vt 0.04429256 0.95944893
+vt 0.96458799 0.95937753
+vt 0.96914428 0.00966259
+vt 0.03816089 0.00966170
+f 1/1 2/2 3/3
+f 7/7 8/8 12/12
+f 1/1 9/9 8/8
+f 10/10 4/4 5/5
+f 9/9 1/1 3/3
+f 4/4 9/9 3/3
+f 1/1 8/8 7/7
+f 9/9 4/4 10/10
+f 6/6 7/7 12/12
+f 6/6 10/10 5/5
+f 6/6 12/12 11/11
+f 10/10 6/6 11/11
+
diff --git a/ai_001_003/background_mesh/27.obj b/ai_001_003/background_mesh/27.obj
new file mode 100644
index 0000000000000000000000000000000000000000..07366f342beb86b1647df25c97a287659f8a49fe
--- /dev/null
+++ b/ai_001_003/background_mesh/27.obj
@@ -0,0 +1,17 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.87513161 -0.86750007 -2.87273312
+v 2.87492013 -0.86750001 -0.19780190
+v 2.87491655 -0.87829882 -0.15249693
+v 2.87491250 -0.94249928 -0.10930972
+v 2.87513113 -0.94250035 -2.87273216
+vt 0.00000000 0.99999923
+vt 0.96797729 1.00000000
+vt 0.98437184 0.85601652
+vt 1.00000000 0.00001431
+vt 0.00000035 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 5/5
+f 2/2 5/5 1/1
+
diff --git a/ai_001_003/background_mesh/28.obj b/ai_001_003/background_mesh/28.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c3caed82a6829e0773b343d9f6678f25894ac472
--- /dev/null
+++ b/ai_001_003/background_mesh/28.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.90200043 7.88199997 -2.87221980
+v -2.74800014 7.88199997 -2.87223601
+v -2.74800038 7.79749060 -2.87223506
+v -2.90200734 7.79751492 -2.87221885
+vt 0.00004489 1.00000000
+vt 1.00000000 1.00000000
+vt 0.99999845 0.00000000
+vt 0.00000000 0.00028776
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_001_003/background_mesh/29.obj b/ai_001_003/background_mesh/29.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ea82de7d297aad5e36ce1b8cf78e373a3bed4949
--- /dev/null
+++ b/ai_001_003/background_mesh/29.obj
@@ -0,0 +1,55 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -1.83815968 7.79734230 -2.96620727
+v -1.83817160 7.70723343 -2.96620631
+v -1.90881956 7.70724440 -2.96619892
+v -1.90882170 7.70724440 -2.96619892
+v -1.89467978 7.79735136 -2.96620131
+v -2.26206660 7.79740953 -2.96616268
+v -1.52729952 7.79729319 -2.96623969
+v -1.52730477 7.70718431 -2.96623874
+v -2.26207185 7.70730066 -2.96616173
+v -1.61209154 7.70719767 -2.96622992
+v -1.59794962 7.79730415 -2.96623230
+v -1.64034176 7.79731083 -2.96622801
+v -1.76750970 7.79733086 -2.96621466
+v -1.73924971 7.79732656 -2.96621752
+v -1.73926163 7.70721769 -2.96621656
+v -1.76752162 7.70722198 -2.96621370
+v -1.56970143 7.70719099 -2.96623445
+v -1.56968951 7.79729986 -2.96623540
+v -1.54142952 7.79729509 -2.96623826
+v -1.54144144 7.70718622 -2.96623731
+v -1.85228968 7.79734468 -2.96620584
+vt 0.57692999 0.99925482
+vt 0.57691371 0.00054435
+vt 0.48076430 0.00066591
+vt 0.48076138 0.00066591
+vt 0.50000805 0.99935526
+vt 0.00000714 1.00000000
+vt 1.00000000 0.99871045
+vt 0.99999285 0.00000000
+vt 0.00000000 0.00128953
+vt 0.88460094 0.00014798
+vt 0.90384763 0.99883205
+vt 0.84615338 0.99890602
+vt 0.67308217 0.99912798
+vt 0.71154302 0.99908042
+vt 0.71152681 0.00036995
+vt 0.67306596 0.00041751
+vt 0.94229245 0.00007399
+vt 0.94230866 0.99878448
+vt 0.98076957 0.99873161
+vt 0.98075336 0.00002114
+vt 0.55769950 0.99928123
+f 21/21 1/1 2/2
+f 4/4 5/5 3/3
+f 9/9 7/7 8/8
+f 7/7 9/9 6/6
+f 10/10 12/12 11/11
+f 16/16 14/14 15/15
+f 14/14 16/16 13/13
+f 17/17 18/18 19/19
+f 19/19 20/20 17/17
+
diff --git a/ai_001_003/background_mesh/3.obj b/ai_001_003/background_mesh/3.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ad6cae1094ea70fdf4b770396ec6b416b410b6cd
--- /dev/null
+++ b/ai_001_003/background_mesh/3.obj
@@ -0,0 +1,86 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.18814278 7.70655203 -0.00091490
+v 3.16795349 7.70655441 -0.02623830
+v 3.18814468 7.70647097 -2.09571910
+v 3.16789031 7.70644617 -2.84393787
+v 3.18814373 7.70644140 -2.87285614
+v 3.16788816 7.70644236 -2.94305277
+v 3.18814421 7.70643711 -2.96673298
+v 3.16788292 7.70643330 -3.16960144
+v 3.18814278 7.70642900 -3.20417094
+v 3.16788197 7.70643187 -3.21207976
+v -5.54814243 7.70781231 -3.20493650
+v -5.54814243 7.70793533 -0.00136534
+v -0.26672471 7.70702171 -2.00279760
+v 2.23947001 7.70662451 -2.00321579
+v 2.25104213 7.70658541 -2.98553157
+v -0.66318989 7.70704746 -2.96632934
+v -0.66318262 7.70708466 -2.00273132
+v 0.96512830 7.70679379 -2.87262321
+v 1.00761068 7.70678711 -2.87262750
+v -1.89504361 7.70727968 -2.00252581
+v -1.05964518 7.70714712 -2.00266528
+v -1.05288827 7.70710850 -2.98553157
+v -3.96061397 7.70756865 -2.98553157
+v -3.94814110 7.70760489 -2.00218320
+v -3.60832357 7.70751810 -2.87214398
+v -3.41008759 7.70748663 -2.87216473
+v 0.96512830 7.70679379 -2.87262321
+v -3.60832357 7.70751810 -2.87214398
+vt 0.00000000 0.99999976
+vt 0.00788604 0.99768883
+vt 0.65235025 1.00000000
+vt 0.88535565 0.99768150
+vt 0.89436120 0.99999988
+vt 0.91622138 0.99768126
+vt 0.92359573 0.99999988
+vt 0.98677170 0.99768072
+vt 0.99753708 0.99999976
+vt 1.00000000 0.99768060
+vt 0.99777550 0.00000000
+vt 0.00014033 0.00000000
+vt 0.62341326 0.60453796
+vt 0.62354350 0.89140981
+vt 0.92944986 0.89273441
+vt 0.92347002 0.55915660
+vt 0.62339264 0.55915743
+vt 0.89428866 0.74554217
+vt 0.89428997 0.75040489
+vt 0.62332863 0.41815230
+vt 0.62337202 0.51377624
+vt 0.92944986 0.51454973
+vt 0.92944986 0.18171658
+vt 0.62322193 0.18314432
+vt 0.89413941 0.22204153
+vt 0.89414591 0.24473263
+vt 0.89428866 0.74554217
+vt 0.89413941 0.22204153
+f 21/21 2/2 17/17
+f 16/16 21/21 17/17
+f 2/2 13/13 17/17
+f 12/12 21/21 20/20
+f 12/12 20/20 24/24
+f 14/14 3/3 4/4
+f 4/4 5/5 6/6
+f 6/6 7/7 8/8
+f 8/8 9/9 10/10
+f 21/21 12/12 1/1
+f 21/21 16/16 22/22
+f 2/2 21/21 1/1
+f 15/15 4/4 6/6
+f 22/22 11/11 23/23
+f 11/11 12/12 24/24
+f 10/10 15/15 8/8
+f 13/13 2/2 14/14
+f 15/15 6/6 8/8
+f 11/11 24/24 23/23
+f 3/3 14/14 2/2
+f 11/11 22/22 10/10
+f 4/4 15/15 14/14
+f 16/16 10/10 22/22
+f 15/15 10/10 16/16
+f 27/27 19/19 18/18
+f 28/28 26/26 25/25
+
diff --git a/ai_001_003/background_mesh/4.obj b/ai_001_003/background_mesh/4.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2e4f6c247fc382d2ffb8cefb2ed4ead6422fd530
--- /dev/null
+++ b/ai_001_003/background_mesh/4.obj
@@ -0,0 +1,161 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.23378420 7.79673100 -2.09557033
+v 2.25104952 7.79669762 -2.90230107
+v 2.21963906 7.79670382 -2.87275553
+v 2.25104880 7.79669666 -2.93059278
+v 2.21963668 7.79669952 -2.96663237
+v -3.87281513 7.79766417 -2.97302961
+v -3.87281489 7.79766512 -2.94473791
+v -3.89134479 7.79766750 -2.96599197
+v -3.96061540 7.79767895 -2.94473815
+v -3.96061611 7.79768133 -2.88815498
+v -3.91963863 7.79767609 -2.87211227
+v -3.96061683 7.79768372 -2.83157182
+v -3.94792700 7.79771376 -2.00219369
+v 2.16873646 7.79674530 -1.99697006
+v 2.25106883 7.79673100 -2.03940797
+v 0.98895246 7.79692841 -2.09536266
+v 2.14890957 7.79674482 -2.09555626
+v 2.14890885 7.79671526 -2.87274814
+v -0.56708747 7.79714537 -2.87246346
+v 1.38503146 7.79683590 -2.87266803
+v 1.38503432 7.79683924 -2.77498841
+v 1.05968118 7.79689026 -2.78913426
+v 1.05968118 7.79690695 -2.35061479
+v 1.03138947 7.79691219 -2.33646894
+v -0.43977261 7.79714441 -2.35061479
+v -0.51050150 7.79715824 -2.29403162
+v -0.51049429 7.79716587 -2.09511232
+v -0.55293411 7.79717255 -2.09510517
+v -0.56708467 7.79717207 -2.15257359
+v -0.56708455 7.79717493 -2.09510279
+v -1.05287278 7.79722357 -2.83157182
+v -1.05287457 7.79721975 -2.93059230
+v -1.07633448 7.79722595 -2.87241030
+v -2.42018294 7.79746819 -2.09479356
+v -1.14706194 7.79726648 -2.09500599
+v -1.13848376 7.79723501 -2.88815498
+v -3.36795568 7.79758883 -2.87216997
+v -2.91529036 7.79751730 -2.87221742
+v -2.91528606 7.79753256 -2.44963527
+v -3.58013821 7.79763794 -2.44963527
+v -3.58013821 7.79764795 -2.19501114
+v -3.49526358 7.79763603 -2.15257359
+v -3.49525642 7.79763842 -2.09461427
+v -3.79231787 7.79768562 -2.09456468
+v -3.80647063 7.79765844 -2.87212420
+v -3.87281418 7.79766750 -2.88815475
+v -3.87281394 7.79766846 -2.85986328
+v -3.84890938 7.79766512 -2.87211967
+v -3.87281370 7.79766989 -2.83157134
+v -3.87280560 7.79769707 -2.12428188
+v -3.84890771 7.79769468 -2.09455514
+vt 0.10101873 0.99721736
+vt 0.92753667 0.99999684
+vt 0.89726645 0.99494022
+vt 0.95652229 0.99999678
+vt 0.99344581 0.99493986
+vt 1.00000000 0.01413492
+vt 0.97101438 0.01413496
+vt 0.99278975 0.01115189
+vt 0.97101462 0.00000023
+vt 0.91304362 0.00000012
+vt 0.89660740 0.00659695
+vt 0.85507256 0.00000000
+vt 0.00535176 0.00204290
+vt 0.00000000 0.98674560
+vt 0.04347881 1.00000000
+vt 0.10080595 0.79681581
+vt 0.10100432 0.98355371
+vt 0.89725888 0.98355359
+vt 0.89696717 0.54631376
+vt 0.89717680 0.86057931
+vt 0.79710132 0.86057979
+vt 0.81159413 0.80820221
+vt 0.36231881 0.80820221
+vt 0.34782597 0.80364758
+vt 0.36231881 0.56680977
+vt 0.30434778 0.55542332
+vt 0.10054947 0.55542451
+vt 0.10054214 0.54859227
+vt 0.15942012 0.54631424
+vt 0.10053969 0.54631424
+vt 0.85507256 0.46810868
+vt 0.95652181 0.46810842
+vt 0.89691275 0.46433166
+vt 0.10022288 0.24798967
+vt 0.10044052 0.45294544
+vt 0.91304362 0.45432645
+vt 0.89666653 0.09541067
+vt 0.89671510 0.16828386
+vt 0.46376804 0.16828455
+vt 0.46376804 0.06125207
+vt 0.20289856 0.06125207
+vt 0.15942012 0.07491577
+vt 0.10003919 0.07491693
+vt 0.09998836 0.02709393
+vt 0.89661962 0.02481552
+vt 0.91304338 0.01413508
+vt 0.88405794 0.01413511
+vt 0.89661497 0.01798343
+vt 0.85507208 0.01413515
+vt 0.13043445 0.01413646
+vt 0.09997858 0.01798370
+f 1/1 2/2 3/3
+f 3/3 4/4 5/5
+f 45/45 6/6 7/7
+f 7/7 8/8 9/9
+f 9/9 10/10 11/11
+f 50/50 12/12 13/13
+f 1/1 14/14 15/15
+f 49/49 48/48 47/47
+f 41/41 43/43 42/42
+f 37/37 39/39 38/38
+f 29/29 35/35 30/30
+f 29/29 28/28 27/27
+f 22/22 24/24 23/23
+f 19/19 25/25 22/22
+f 22/22 21/21 20/20
+f 14/14 16/16 30/30
+f 13/13 34/34 51/51
+f 7/7 9/9 11/11
+f 35/35 13/13 14/14
+f 11/11 46/46 7/7
+f 43/43 41/41 44/44
+f 39/39 37/37 40/40
+f 26/26 35/35 29/29
+f 29/29 27/27 26/26
+f 24/24 22/22 25/25
+f 19/19 22/22 20/20
+f 13/13 35/35 34/34
+f 49/49 12/12 50/50
+f 13/13 51/51 50/50
+f 40/40 44/44 41/41
+f 31/31 35/35 26/26
+f 19/19 26/26 25/25
+f 26/26 19/19 31/31
+f 14/14 30/30 35/35
+f 12/12 49/49 11/11
+f 44/44 40/40 45/45
+f 35/35 31/31 36/36
+f 32/32 31/31 19/19
+f 14/14 17/17 16/16
+f 47/47 11/11 49/49
+f 45/45 40/40 37/37
+f 36/36 31/31 33/33
+f 5/5 19/19 18/18
+f 14/14 1/1 17/17
+f 46/46 11/11 47/47
+f 6/6 45/45 37/37
+f 36/36 33/33 32/32
+f 3/3 17/17 1/1
+f 45/45 7/7 46/46
+f 37/37 36/36 32/32
+f 17/17 3/3 18/18
+f 6/6 37/37 32/32
+f 5/5 18/18 3/3
+f 6/6 32/32 5/5
+f 19/19 5/5 32/32
+
diff --git a/ai_001_003/background_mesh/5.obj b/ai_001_003/background_mesh/5.obj
new file mode 100644
index 0000000000000000000000000000000000000000..3582fa15ea4d77ee97731c1438c3e438eee68a66
--- /dev/null
+++ b/ai_001_003/background_mesh/5.obj
@@ -0,0 +1,654 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.36737895 3.53963995 -3.14218450
+v 3.36738229 3.52791834 -2.96670771
+v 3.36730552 2.23900962 -2.96669412
+v 3.36731291 2.23901010 -2.64645052
+v 3.36731124 2.21068239 -2.64645052
+v 3.36730385 2.21068239 -2.96669388
+v 3.36729956 2.13986301 -2.96669316
+v 3.36730599 2.12569952 -2.66061449
+v 3.36730075 2.09737206 -2.81641650
+v 3.36729789 2.11153579 -2.96669269
+v 3.36729288 2.02655244 -2.96669197
+v 3.36730003 2.02655268 -2.66061449
+v 3.36729836 1.99822521 -2.66061449
+v 3.36729217 2.01238894 -2.96669173
+v 3.36728787 1.94156945 -2.96669102
+v 3.36729503 1.94156981 -2.66061449
+v 3.36729240 1.89907837 -2.66061449
+v 3.36728525 1.89907849 -2.96669054
+v 3.36728120 1.82825887 -2.96668983
+v 3.36728764 1.82825923 -2.67477846
+v 3.36728597 1.79993165 -2.67477846
+v 3.36727953 1.79993153 -2.96668959
+v 3.36727595 1.74327600 -2.96668887
+v 3.36727834 1.74327683 -2.87281203
+v 3.36727667 1.71494818 -2.87281179
+v 3.36728263 1.74327636 -2.67477846
+v 3.36727929 1.68662107 -2.67477846
+v 3.36727262 1.68662119 -2.96668839
+v 3.36726928 1.62996542 -2.96668768
+v 3.36727595 1.62996578 -2.67477846
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diff --git a/ai_001_003/background_mesh/6.obj b/ai_001_003/background_mesh/6.obj
new file mode 100644
index 0000000000000000000000000000000000000000..fc1cb6dcc1447f6efbf8a09f5076b9189e6d4f57
--- /dev/null
+++ b/ai_001_003/background_mesh/6.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
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diff --git a/ai_001_003/background_mesh/7.obj b/ai_001_003/background_mesh/7.obj
new file mode 100644
index 0000000000000000000000000000000000000000..7191b3155992185f77803671a42f8adf30caa1f6
--- /dev/null
+++ b/ai_001_003/background_mesh/7.obj
@@ -0,0 +1,214 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
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diff --git a/ai_001_003/background_mesh/8.obj b/ai_001_003/background_mesh/8.obj
new file mode 100644
index 0000000000000000000000000000000000000000..7e1c9cb9ce08a7b541f504fb6fb59ae0ebd2d679
--- /dev/null
+++ b/ai_001_003/background_mesh/8.obj
@@ -0,0 +1,213 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
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