diff --git a/ai_002_004/background_mesh/1.obj b/ai_002_004/background_mesh/1.obj
new file mode 100644
index 0000000000000000000000000000000000000000..4a50cad5ad3366e91358e10cb1c40756040c6326
--- /dev/null
+++ b/ai_002_004/background_mesh/1.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.89207721 3.42588592 -2.70293236
+v 2.81207728 3.42592287 -2.70293236
+v 2.80018210 -1.93723595 -2.70293236
+v -2.89207721 -1.93722653 -2.70293212
+vt 0.00000000 0.99999315
+vt 1.00000000 1.00000000
+vt 0.99791467 0.00000000
+vt 0.00000000 0.00000173
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/10.obj b/ai_002_004/background_mesh/10.obj
new file mode 100644
index 0000000000000000000000000000000000000000..f8d9bf3f71747fe827be284526e97f8c5aff435e
--- /dev/null
+++ b/ai_002_004/background_mesh/10.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.28285694 -1.30941033 -2.08214283
+v -2.28285694 -1.30942202 -1.66785705
+v -2.80038142 -1.30946541 -1.66785705
+v -2.80038142 -1.30945361 -2.08214283
+vt 0.00000000 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/11.obj b/ai_002_004/background_mesh/11.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a15e9fa2051c6bc634d198bfdb6328a318dbf4fc
--- /dev/null
+++ b/ai_002_004/background_mesh/11.obj
@@ -0,0 +1,11 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -0.35031748 -1.54402542 -1.39674604
+v -2.10082936 -1.54412520 -1.39674604
+v -2.07380986 -1.54412377 -1.45362866
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00048806 0.01543520
+f 3/3 1/1 2/2
+
diff --git a/ai_002_004/background_mesh/12.obj b/ai_002_004/background_mesh/12.obj
new file mode 100644
index 0000000000000000000000000000000000000000..db889ea193108a2dcad0f47c0757635443121287
--- /dev/null
+++ b/ai_002_004/background_mesh/12.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.25893807 -1.49552715 -2.21642113
+v 1.05893779 -1.49552715 -2.21644258
+v 1.05894148 -1.54394543 -2.16322875
+v -2.25893664 -1.54413450 -2.16299939
+vt 0.00000000 0.99999946
+vt 0.99999899 1.00000000
+vt 1.00000000 0.00389128
+vt 0.00000036 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/13.obj b/ai_002_004/background_mesh/13.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c9ff209eec7939c41120599cbbabb7d02dc7b231
--- /dev/null
+++ b/ai_002_004/background_mesh/13.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.65033698 0.25756490 -2.61206627
+v -2.64727330 0.25760022 -0.90007055
+v -2.80047059 0.25764093 -0.88793385
+v -2.80047059 0.25760454 -2.61206627
+vt 0.00000000 0.98000163
+vt 0.99296069 1.00000000
+vt 1.00000000 0.00000005
+vt 0.00000000 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/14.obj b/ai_002_004/background_mesh/14.obj
new file mode 100644
index 0000000000000000000000000000000000000000..0e88f4a438d57daa786a68bc31e098ca6eb5540c
--- /dev/null
+++ b/ai_002_004/background_mesh/14.obj
@@ -0,0 +1,70 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.36381578 1.00473511 -2.70293236
+v 2.36381578 1.00470865 -0.00031709
+v 2.11050320 1.00472081 0.00207913
+v 2.10897350 1.00474644 -2.60312867
+v 1.51434207 1.00477505 -2.60312867
+v 1.50961399 1.00477612 -2.68792105
+v -2.36492181 1.00494528 -0.90006590
+v -2.25165868 1.00493979 -0.90006667
+v -2.19967866 1.00493693 -0.86155260
+v -2.23753333 1.00493515 -0.48337808
+v -2.19967866 1.00492954 -0.11118400
+v -2.29413176 1.00493407 -0.11118400
+v -2.30828953 1.00493371 -0.00031709
+v -2.80381584 1.00495756 -0.00031709
+v -2.80051327 1.00496590 -0.86155260
+v -2.76134229 1.00496435 -0.90006310
+v -2.69055295 1.00496101 -0.90006357
+v -2.65037966 1.00495863 -0.86155260
+v -2.60560584 1.00495684 -0.90006417
+v -2.36492157 1.00496197 -2.60312867
+v -2.20918465 1.00495446 -2.60312867
+v -2.20918465 1.00495541 -2.70293236
+v -2.80381584 1.00498402 -2.70293236
+v -2.80381584 1.00498307 -2.60312867
+vt 0.00000000 1.00000000
+vt 0.99911422 1.00000000
+vt 1.00000000 0.95098090
+vt 0.03689585 0.95068491
+vt 0.03689585 0.83561647
+vt 0.00554944 0.83470148
+vt 0.66649127 0.08493137
+vt 0.66649103 0.10684917
+vt 0.68072903 0.11690794
+vt 0.82053423 0.10958260
+vt 0.95812839 0.11690794
+vt 0.95812839 0.09863012
+vt 0.99911422 0.09589041
+vt 0.99911422 0.00000000
+vt 0.68072903 0.00063909
+vt 0.66649234 0.00821915
+vt 0.66649216 0.02191776
+vt 0.68072903 0.02969178
+vt 0.66649187 0.03835606
+vt 0.03689585 0.08493142
+vt 0.03689585 0.11506842
+vt 0.00000000 0.11506842
+vt 0.00000000 0.00000000
+vt 0.03689585 0.00000000
+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
+f 7/7 8/8 9/9
+f 10/10 11/11 12/12
+f 12/12 13/13 14/14
+f 17/17 15/15 16/16
+f 15/15 17/17 18/18
+f 18/18 19/19 7/7
+f 7/7 9/9 10/10
+f 10/10 12/12 14/14
+f 15/15 18/18 14/14
+f 18/18 7/7 10/10
+f 10/10 14/14 18/18
+f 20/20 24/24 23/23
+f 20/20 22/22 21/21
+f 22/22 20/20 23/23
+
diff --git a/ai_002_004/background_mesh/15.obj b/ai_002_004/background_mesh/15.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ede0996abb1977f32e682ebea8fd3f1b2c615c55
--- /dev/null
+++ b/ai_002_004/background_mesh/15.obj
@@ -0,0 +1,23 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 1.00020576 -1.24274790 -0.01207650
+v 1.00019729 -1.24274790 -2.33316946
+v 1.00019598 -1.26721978 -2.34103060
+v 1.00019717 -1.24274790 -2.37562847
+v 1.00019646 -1.24274790 -2.58792353
+v 1.00016093 -1.84221315 -2.60312867
+v 1.00017023 -1.84371352 0.00207651
+vt 0.00543259 1.00000000
+vt 0.89637709 1.00000000
+vt 0.89939457 0.95927906
+vt 0.91267484 1.00000000
+vt 0.99416363 1.00000000
+vt 1.00000000 0.00249660
+vt 0.00000000 0.00000000
+f 7/7 2/2 3/3
+f 3/3 4/4 5/5
+f 3/3 6/6 7/7
+f 2/2 7/7 1/1
+f 6/6 3/3 5/5
+
diff --git a/ai_002_004/background_mesh/16.obj b/ai_002_004/background_mesh/16.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2d49905a2f6a9af3c1819ab5043a1f61820e8872
--- /dev/null
+++ b/ai_002_004/background_mesh/16.obj
@@ -0,0 +1,35 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.36000109 1.00470877 0.00653518
+v 2.35992050 1.00473535 -2.70653534
+v 2.36024880 -0.26210296 -2.70293236
+v 2.36027694 -0.26210287 -1.75482988
+v 2.36028576 -0.29001385 -1.70736551
+v 2.36027932 -0.26203579 -1.68388712
+v 2.36027956 -0.25055707 -1.56972480
+v 2.36028910 -0.26167238 -1.35761523
+v 2.36028242 -0.23369443 -1.33413696
+v 2.36029077 -0.26210287 -1.28607941
+v 2.36032891 -0.26210296 -0.00031709
+vt 0.00000000 0.99997938
+vt 1.00000000 1.00000000
+vt 0.99867201 0.02155699
+vt 0.64921463 0.02155706
+vt 0.63171995 0.00000000
+vt 0.62306613 0.02160888
+vt 0.58098751 0.03047447
+vt 0.50280684 0.02188956
+vt 0.49415308 0.04349833
+vt 0.47643974 0.02155706
+vt 0.00252565 0.02155699
+f 4/4 2/2 3/3
+f 4/4 5/5 6/6
+f 7/7 8/8 9/9
+f 1/1 10/10 11/11
+f 7/7 2/2 4/4
+f 4/4 6/6 7/7
+f 10/10 1/1 9/9
+f 9/9 2/2 7/7
+f 2/2 9/9 1/1
+
diff --git a/ai_002_004/background_mesh/17.obj b/ai_002_004/background_mesh/17.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c17be12a8cfd5042d34c86ef43e0add368af824b
--- /dev/null
+++ b/ai_002_004/background_mesh/17.obj
@@ -0,0 +1,148 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.27214074 2.30178809 -0.39434212
+v 2.27207565 2.28952718 -2.70293236
+v 2.27274323 -0.28721055 -2.70293236
+v 2.27274609 -0.28721055 -2.60312867
+v 2.27279377 -0.47126326 -2.60312867
+v 2.27280164 -0.48542106 -2.44723701
+v 2.27281332 -0.47126317 -1.93755269
+v 2.27282333 -0.50274360 -1.88588130
+v 2.27281523 -0.46788609 -1.85662973
+v 2.27281570 -0.46185088 -1.79303217
+v 2.27283025 -0.49030173 -1.54947352
+v 2.27282190 -0.45410800 -1.51910067
+v 2.27284122 -0.48542106 -1.11639464
+v 2.27286363 -0.47126317 -0.23860514
+v 2.27281594 -0.28721052 -0.23860514
+v 2.27282023 -0.28721052 -0.09702624
+v 2.27286863 -0.47126317 -0.06871045
+v 2.27287102 -0.47126326 -0.00031709
+v 2.27215576 2.28952718 -0.00031709
+v 2.27220440 2.06300020 -0.32355249
+v 2.27216792 2.20242620 -0.35186863
+v 2.27211261 2.20237136 -2.22071123
+v 2.27212167 2.16210628 -2.25860000
+v 2.27219510 1.87894773 -2.25860262
+v 2.27219296 1.87894785 -2.31981564
+v 2.27237701 1.14273715 -2.54634237
+v 2.27237558 1.14273727 -2.60312867
+v 2.27240491 1.02947414 -2.60312867
+v 2.27241182 1.00473821 -2.58881569
+v 2.27248788 1.00471318 -0.02623677
+v 2.27246022 1.11442149 -0.00031709
+v 2.27245831 1.11442137 -0.05455243
+v 2.27242732 1.23030949 -0.10558093
+v 2.27240658 1.31143332 -0.09559762
+v 2.27235746 1.49462736 -0.15120614
+v 2.27235389 1.50501204 -0.17773873
+v 2.27233863 1.56765962 -0.14845228
+v 2.27232933 1.59578979 -0.19613133
+v 2.27320170 -1.84364092 -0.84739465
+v 2.27314758 -1.84364092 -2.67376328
+v 2.27315021 -1.85873759 -2.70293236
+v 2.27317238 -1.94368470 -2.70293236
+v 2.27319860 -1.94368458 -1.81013155
+v 2.27319121 -1.90780699 -1.76332986
+v 2.27321172 -1.97828186 -1.68587363
+v 2.27320361 -1.94368458 -1.64023685
+v 2.27325249 -1.94368470 -0.00031709
+v 2.27323413 -1.87289536 -0.00031709
+v 2.27322555 -1.84364092 -0.04039468
+vt 0.14579397 1.00000000
+vt 1.00000000 0.99713534
+vt 1.00000000 0.39510363
+vt 0.96307147 0.39510363
+vt 0.96307147 0.35210139
+vt 0.90538967 0.34879354
+vt 0.71680033 0.35210142
+vt 0.69768131 0.34474629
+vt 0.68685788 0.35289043
+vt 0.66332603 0.35430050
+vt 0.57320642 0.34765324
+vt 0.56196809 0.35610956
+vt 0.41296205 0.34879354
+vt 0.08816943 0.35210142
+vt 0.08816943 0.39510366
+vt 0.03578354 0.39510366
+vt 0.02530636 0.35210142
+vt 0.00000000 0.35210139
+vt 0.00000000 0.99713534
+vt 0.11960097 0.94420928
+vt 0.13007827 0.97678500
+vt 0.82157242 0.97677219
+vt 0.83559173 0.96736461
+vt 0.83559269 0.90120709
+vt 0.85824221 0.90120715
+vt 0.94205981 0.72919816
+vt 0.96307147 0.72919816
+vt 0.96307147 0.70273525
+vt 0.95777547 0.69695592
+vt 0.00959059 0.69695008
+vt 0.00000000 0.72258240
+vt 0.02006773 0.72258234
+vt 0.03894888 0.74965858
+vt 0.03525494 0.76861244
+vt 0.05583075 0.81141412
+vt 0.06564810 0.81384039
+vt 0.05481179 0.82847750
+vt 0.07245362 0.83504981
+vt 0.31342882 0.03145764
+vt 0.98920709 0.03145764
+vt 1.00000000 0.02793044
+vt 1.00000000 0.00808332
+vt 0.66965300 0.00808332
+vt 0.65233582 0.01646582
+vt 0.62367612 0.00000000
+vt 0.60678995 0.00808332
+vt 0.00000000 0.00808332
+vt 0.00000000 0.02462261
+vt 0.01482918 0.03145764
+f 27/27 26/26 25/25
+f 25/25 24/24 23/23
+f 37/37 20/20 38/38
+f 37/37 36/36 35/35
+f 31/31 33/33 32/32
+f 37/37 31/31 19/19
+f 22/22 1/1 2/2
+f 29/29 3/3 4/4
+f 4/4 5/5 6/6
+f 7/7 8/8 9/9
+f 10/10 11/11 12/12
+f 15/15 13/13 14/14
+f 16/16 17/17 18/18
+f 18/18 31/31 30/30
+f 2/2 25/25 23/23
+f 19/19 20/20 37/37
+f 37/37 35/35 34/34
+f 33/33 31/31 34/34
+f 4/4 6/6 7/7
+f 29/29 9/9 10/10
+f 30/30 13/13 15/15
+f 16/16 18/18 30/30
+f 31/31 37/37 34/34
+f 29/29 7/7 9/9
+f 30/30 12/12 13/13
+f 15/15 16/16 30/30
+f 20/20 19/19 21/21
+f 29/29 10/10 12/12
+f 12/12 30/30 29/29
+f 1/1 21/21 19/19
+f 7/7 29/29 4/4
+f 21/21 1/1 22/22
+f 3/3 29/29 28/28
+f 23/23 22/22 2/2
+f 3/3 28/28 2/2
+f 25/25 2/2 27/27
+f 2/2 28/28 27/27
+f 42/42 40/40 41/41
+f 40/40 42/42 43/43
+f 44/44 45/45 46/46
+f 49/49 47/47 48/48
+f 47/47 49/49 39/39
+f 40/40 43/43 44/44
+f 47/47 39/39 46/46
+f 40/40 44/44 39/39
+f 46/46 39/39 44/44
+
diff --git a/ai_002_004/background_mesh/18.obj b/ai_002_004/background_mesh/18.obj
new file mode 100644
index 0000000000000000000000000000000000000000..c6c1ec69e6d86376a064e0837342c7a463430dca
--- /dev/null
+++ b/ai_002_004/background_mesh/18.obj
@@ -0,0 +1,34 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.27208281 2.30192971 -2.34365702
+v 2.27215242 2.30175924 0.00334011
+v -2.90442204 2.30227852 -0.00031709
+v -2.90442204 2.30247498 -2.70293212
+v 2.25614524 2.30195737 -2.70293212
+v -1.54712212 2.30230641 -2.25857162
+v -0.17568371 2.30216885 -2.25858140
+v -0.17462559 2.30206895 -0.88738775
+v -1.67436922 2.30222058 -0.90005928
+v -1.67436922 2.30231905 -2.25857067
+vt 0.13275646 0.99998653
+vt 1.00000000 1.00000000
+vt 0.99864864 0.00000000
+vt 0.00000000 0.00000000
+vt 0.00000000 0.99690771
+vt 0.16419654 0.26220039
+vt 0.16419291 0.52713203
+vt 0.67086542 0.52733642
+vt 0.66618317 0.23761906
+vt 0.16419688 0.23761906
+f 4/4 7/7 6/6
+f 8/8 7/7 1/1
+f 7/7 5/5 1/1
+f 4/4 6/6 10/10
+f 8/8 1/1 2/2
+f 7/7 4/4 5/5
+f 3/3 8/8 2/2
+f 9/9 4/4 10/10
+f 8/8 3/3 9/9
+f 4/4 9/9 3/3
+
diff --git a/ai_002_004/background_mesh/19.obj b/ai_002_004/background_mesh/19.obj
new file mode 100644
index 0000000000000000000000000000000000000000..eb2ef8330242e99b08f6dcd0859f52d5e764d9d6
--- /dev/null
+++ b/ai_002_004/background_mesh/19.obj
@@ -0,0 +1,101 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.11073732 0.08208999 -0.15387988
+v 2.11071253 0.08208999 -0.99044752
+v 2.11070347 0.11385450 -1.04247868
+v 2.11071157 0.07894465 -1.07177413
+v 2.11070752 0.07319033 -1.24922752
+v 2.11066198 0.08209000 -2.70293236
+v 2.11115789 -1.83209050 -2.70293236
+v 2.11116362 -1.84365022 -2.62104535
+v 2.11115718 -1.81791127 -2.60312867
+v 2.11114693 -1.78033328 -2.63203216
+v 2.11107183 -1.48825431 -2.60836411
+v 2.11104512 -1.38686240 -2.62780833
+v 2.11103582 -1.35000074 -2.60312867
+v 2.11098814 -1.16567218 -2.60312867
+v 2.11097574 -1.11904585 -2.63022614
+v 2.11096978 -1.09477663 -2.60312867
+v 2.11075306 -0.25820875 -2.60312867
+v 2.11075544 -0.25820869 -2.52179146
+v 2.11086559 -0.68358207 -2.52179146
+v 2.11089635 -0.79701495 -2.47925425
+v 2.11089802 -0.79701495 -2.42253780
+v 2.11090899 -0.83955228 -2.42253780
+v 2.11092162 -0.85990417 -2.18559861
+v 2.11091709 -0.82018495 -1.98916805
+v 2.11092424 -0.84446663 -1.96295071
+v 2.11092663 -0.83888334 -1.84199166
+v 2.11091995 -0.81095558 -1.81855536
+v 2.11092830 -0.83955228 -1.77029860
+v 2.11096954 -0.83955228 -0.38074565
+v 2.11091065 -0.61268651 -0.38074565
+v 2.11091328 -0.61268651 -0.29567099
+v 2.11082149 -0.25820869 -0.29567099
+v 2.11082554 -0.25820869 -0.15387988
+vt 0.00000000 0.98377293
+vt 0.32818767 0.98377293
+vt 0.34859964 1.00000000
+vt 0.36009234 0.98216623
+vt 0.42970777 0.97922659
+vt 1.00000000 0.98377299
+vt 1.00000000 0.00590534
+vt 0.96787554 0.00000000
+vt 0.96084672 0.01314886
+vt 0.97218567 0.03234568
+vt 0.96290064 0.18155558
+vt 0.97052866 0.23335209
+vt 0.96084672 0.25218302
+vt 0.96084672 0.34634811
+vt 0.97147715 0.37016737
+vt 0.96084672 0.38256541
+vt 0.96084672 0.80992991
+vt 0.92893797 0.80992991
+vt 0.92893797 0.59262604
+vt 0.91225046 0.53467828
+vt 0.89000046 0.53467834
+vt 0.89000046 0.51294792
+vt 0.79704863 0.50255108
+vt 0.71998841 0.52284181
+vt 0.70970327 0.51043743
+vt 0.66225070 0.51328963
+vt 0.65305656 0.52755666
+vt 0.63412529 0.51294792
+vt 0.08900004 0.51294792
+vt 0.08900004 0.62884337
+vt 0.05562503 0.62884337
+vt 0.05562503 0.80992991
+vt 0.00000000 0.80992991
+f 2/2 3/3 4/4
+f 10/10 8/8 9/9
+f 7/7 11/11 12/12
+f 12/12 13/13 14/14
+f 15/15 16/16 17/17
+f 21/21 19/19 20/20
+f 21/21 22/22 23/23
+f 27/27 25/25 26/26
+f 30/30 28/28 29/29
+f 30/30 31/31 32/32
+f 32/32 33/33 1/1
+f 30/30 2/2 4/4
+f 8/8 10/10 7/7
+f 12/12 14/14 15/15
+f 23/23 19/19 21/21
+f 18/18 23/23 24/24
+f 25/25 27/27 24/24
+f 4/4 28/28 30/30
+f 2/2 32/32 1/1
+f 11/11 7/7 10/10
+f 7/7 12/12 15/15
+f 23/23 18/18 19/19
+f 28/28 5/5 27/27
+f 2/2 30/30 32/32
+f 7/7 15/15 6/6
+f 27/27 18/18 24/24
+f 28/28 4/4 5/5
+f 6/6 15/15 17/17
+f 27/27 5/5 18/18
+f 18/18 6/6 17/17
+f 6/6 18/18 5/5
+
diff --git a/ai_002_004/background_mesh/2.obj b/ai_002_004/background_mesh/2.obj
new file mode 100644
index 0000000000000000000000000000000000000000..0e3ce14c8433ecc7b7e092817ab56aafef3371e2
--- /dev/null
+++ b/ai_002_004/background_mesh/2.obj
@@ -0,0 +1,72 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.65033698 0.25760120 -0.89204901
+v -2.65033698 0.25756490 -2.61204910
+v -2.65028000 -0.74472088 -2.61204934
+v -2.65028000 -0.74480909 -0.87795109
+v -2.65028119 -0.72434419 -0.90007925
+v -2.65031838 -0.06990093 -1.41803956
+v -2.65032196 -0.01201969 -1.45071101
+v -2.65031934 -0.05419379 -1.45085526
+v -2.65030384 -0.32834035 -1.47157168
+v -2.65031433 -0.14036345 -1.47716999
+v -2.65031481 -0.13221306 -1.45363128
+v -2.65029407 -0.49877045 -1.45362818
+v -2.65030646 -0.28269571 -1.43326783
+v -2.65031028 -0.21268398 -1.43269587
+v -2.65030694 -0.27319679 -1.45363009
+v -2.65030217 -0.35778683 -1.13172126
+v -2.65030622 -0.28729504 -1.13172126
+v -2.65030622 -0.28729504 -1.18811476
+v -2.65030289 -0.34368849 -1.20221305
+v -2.65030217 -0.35778683 -1.17401636
+v -2.65030384 -0.32959014 -1.15991807
+vt 0.00812983 1.00000000
+vt 0.99999988 0.99996370
+vt 1.00000000 0.00008800
+vt 0.00000000 0.00000000
+vt 0.01276062 0.02041569
+vt 0.31145206 0.67328537
+vt 0.33029267 0.73102742
+vt 0.33037585 0.68895471
+vt 0.34232238 0.41546735
+vt 0.34555075 0.60299224
+vt 0.33197671 0.61112303
+vt 0.33197492 0.24544704
+vt 0.32023373 0.46100223
+vt 0.31990391 0.53084564
+vt 0.33197603 0.47047833
+vt 0.14634129 0.38609165
+vt 0.14634129 0.45641395
+vt 0.17886166 0.45641395
+vt 0.18699169 0.40015611
+vt 0.17073154 0.38609165
+vt 0.16260152 0.41422054
+f 12/12 4/4 5/5
+f 20/20 16/16 21/21
+f 13/13 18/18 14/14
+f 13/13 15/15 12/12
+f 11/11 15/15 14/14
+f 11/11 6/6 8/8
+f 14/14 18/18 6/6
+f 17/17 16/16 5/5
+f 16/16 20/20 5/5
+f 18/18 13/13 19/19
+f 6/6 11/11 14/14
+f 17/17 6/6 18/18
+f 17/17 5/5 1/1
+f 12/12 20/20 19/19
+f 19/19 13/13 12/12
+f 10/10 11/11 8/8
+f 1/1 6/6 17/17
+f 20/20 12/12 5/5
+f 10/10 8/8 7/7
+f 6/6 1/1 7/7
+f 4/4 12/12 3/3
+f 7/7 1/1 2/2
+f 9/9 3/3 12/12
+f 10/10 7/7 2/2
+f 10/10 3/3 9/9
+f 3/3 10/10 2/2
+
diff --git a/ai_002_004/background_mesh/20.obj b/ai_002_004/background_mesh/20.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a21c35d6fce211e308dbdf7f24ac045df1ef93b9
--- /dev/null
+++ b/ai_002_004/background_mesh/20.obj
@@ -0,0 +1,20 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 1.50965512 0.14499933 -2.70293236
+v 1.50965476 0.14499933 -2.60312867
+v 1.50971627 -1.14708853 -2.59940147
+v 1.50972331 -1.29499912 -2.60312867
+v 1.50972414 -1.30907619 -2.62750053
+v 1.50972366 -1.29499912 -2.70293236
+vt 0.00000000 1.00000000
+vt 0.96399915 1.00000000
+vt 1.00000000 0.11140250
+vt 0.96399915 0.00968111
+vt 0.72859246 0.00000000
+vt 0.00000000 0.00968111
+f 1/1 2/2 3/3
+f 6/6 4/4 5/5
+f 3/3 6/6 1/1
+f 4/4 6/6 3/3
+
diff --git a/ai_002_004/background_mesh/21.obj b/ai_002_004/background_mesh/21.obj
new file mode 100644
index 0000000000000000000000000000000000000000..5414913b3b9bedb1e0a0e1f0bf1885878404c3f7
--- /dev/null
+++ b/ai_002_004/background_mesh/21.obj
@@ -0,0 +1,25 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 0.89874327 -1.24275362 -2.61206532
+v 0.89880681 -1.24275362 -0.01206517
+v 0.89877504 -1.85380435 -0.00031709
+v 0.89871138 -1.85380435 -2.60312867
+v 0.89874321 -1.59945655 -1.84902167
+v 0.89874643 -1.54395425 -1.83489132
+v 0.89874578 -1.54395425 -1.86315215
+vt 0.00000000 1.00000000
+vt 0.99550182 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00342171 0.00000000
+vt 0.29215819 0.41624662
+vt 0.29756850 0.50707752
+vt 0.28674784 0.50707752
+f 6/6 2/2 3/3
+f 4/4 7/7 5/5
+f 7/7 4/4 1/1
+f 3/3 4/4 5/5
+f 6/6 7/7 1/1
+f 3/3 5/5 6/6
+f 2/2 6/6 1/1
+
diff --git a/ai_002_004/background_mesh/22.obj b/ai_002_004/background_mesh/22.obj
new file mode 100644
index 0000000000000000000000000000000000000000..015544f63ddb80c521a137c0450bb86b00e41fd9
--- /dev/null
+++ b/ai_002_004/background_mesh/22.obj
@@ -0,0 +1,23 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.49589825 -1.24294722 -2.40243220
+v -2.52410340 -1.24294889 -2.40243316
+v -2.52410245 -1.29020083 -2.44208598
+v -2.80038190 -1.30224180 -2.45218563
+v -2.22794819 -1.30939496 -2.45819783
+v -2.22794843 -1.29019928 -2.44208956
+v -2.49589729 -1.29020071 -2.44208622
+vt 0.46809074 1.00000000
+vt 0.51736307 0.99997467
+vt 0.51736027 0.28885850
+vt 1.00000000 0.10765054
+vt 0.00000000 0.00000000
+vt 0.00000089 0.28888211
+vt 0.46808794 0.28886124
+f 7/7 2/2 3/3
+f 3/3 4/4 5/5
+f 5/5 6/6 7/7
+f 2/2 7/7 1/1
+f 3/3 5/5 7/7
+
diff --git a/ai_002_004/background_mesh/23.obj b/ai_002_004/background_mesh/23.obj
new file mode 100644
index 0000000000000000000000000000000000000000..83be495c92a180d0fec5af4d3ec4e4943f314fb4
--- /dev/null
+++ b/ai_002_004/background_mesh/23.obj
@@ -0,0 +1,55 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.45136523 -1.30941236 -2.50420570
+v -2.42204857 -1.30940986 -2.50420403
+v -2.42204952 -1.26646900 -2.46816921
+v -2.46602464 -1.26646924 -2.46816874
+v -2.23149109 -1.26646805 -2.46817160
+v -2.78850818 -1.26647091 -2.46816468
+v -2.80316687 -1.30944192 -2.50422454
+v -2.21683192 -1.30939269 -2.50419307
+v -2.19954801 -1.28552270 -2.48416209
+v -2.52465701 -1.30941844 -2.50420952
+v -2.52465796 -1.26646960 -2.46816802
+v -2.55397463 -1.26646972 -2.46816754
+v -2.55397367 -1.30942094 -2.50421119
+v -2.58329129 -1.26646984 -2.46816730
+v -2.56863213 -1.30942214 -2.50421190
+v -2.59794879 -1.30942464 -2.50421357
+v -2.61260796 -1.26647007 -2.46816683
+v -2.65024900 -1.28552341 -2.48415542
+v -2.62726545 -1.30942714 -2.50421524
+vt 0.41717884 0.00068642
+vt 0.36861068 0.00074532
+vt 0.36861324 0.99997807
+vt 0.44146571 0.99997193
+vt 0.05291972 1.00000000
+vt 0.97571629 0.99993426
+vt 1.00000000 0.00000000
+vt 0.02863325 0.00114441
+vt 0.00000000 0.55660087
+vt 0.53859955 0.00054577
+vt 0.53860211 0.99996406
+vt 0.58717030 0.99996233
+vt 0.58716774 0.00048687
+vt 0.63573849 0.99995786
+vt 0.61145204 0.00045965
+vt 0.66002023 0.00040075
+vt 0.68430668 0.99995446
+vt 0.74666530 0.55658191
+vt 0.70858842 0.00034185
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+f 14/14 15/15 5/5
+f 8/8 9/9 5/5
+f 14/14 5/5 6/6
+f 8/8 5/5 15/15
+f 16/16 14/14 6/6
+f 8/8 15/15 16/16
+f 16/16 6/6 7/7
+f 7/7 8/8 16/16
+f 10/10 11/11 12/12
+f 12/12 13/13 10/10
+f 17/17 18/18 19/19
+
diff --git a/ai_002_004/background_mesh/24.obj b/ai_002_004/background_mesh/24.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2446e480dc5c679b59e1f80f79b12ce049e17aa0
--- /dev/null
+++ b/ai_002_004/background_mesh/24.obj
@@ -0,0 +1,39 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.41082954 -1.24294257 -2.36712360
+v -2.43940401 -1.24294412 -2.36722159
+v -2.43930364 -1.30841446 -2.42206860
+v -2.46787810 -1.30836439 -2.42212343
+v -2.46797967 -1.24294579 -2.36731982
+v -2.48216581 -1.30833936 -2.42215085
+v -2.49655437 -1.24294746 -2.36741781
+v -2.71067595 -1.30943620 -2.42384410
+v -2.80038285 -1.27925289 -2.39886093
+v -2.76788306 -1.30783904 -2.42269897
+v -2.51074100 -1.30828941 -2.42220569
+v -2.41072845 -1.30846453 -2.42201400
+v -2.70371628 -1.30795145 -2.42257595
+vt 0.00000000 1.00000000
+vt 0.07333250 0.99997699
+vt 0.07355138 0.01537274
+vt 0.14688352 0.01612530
+vt 0.14666808 0.99995112
+vt 0.18355079 0.01650164
+vt 0.22000119 0.99992698
+vt 0.76999909 0.00000000
+vt 1.00000000 0.45393205
+vt 0.91680175 0.02402532
+vt 0.25688475 0.01725317
+vt 0.00021744 0.01461837
+vt 0.75212723 0.02233462
+f 3/3 1/1 2/2
+f 4/4 5/5 6/6
+f 6/6 7/7 11/11
+f 1/1 3/3 12/12
+f 4/4 6/6 11/11
+f 4/4 12/12 3/3
+f 12/12 4/4 11/11
+f 13/13 9/9 10/10
+f 10/10 8/8 13/13
+
diff --git a/ai_002_004/background_mesh/25.obj b/ai_002_004/background_mesh/25.obj
new file mode 100644
index 0000000000000000000000000000000000000000..f9a7c6d540b5d0412dee25046da6bf48581ef888
--- /dev/null
+++ b/ai_002_004/background_mesh/25.obj
@@ -0,0 +1,26 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.80038214 -1.29694200 -2.52898216
+v -2.76384616 -1.24828565 -2.48815179
+v -2.69333339 -1.24828529 -2.48815250
+v -2.65024924 -1.28613985 -2.51991987
+v -2.60871792 -1.24828494 -2.48815346
+v -2.35487151 -1.24828351 -2.48815656
+v -2.35486841 -1.30940354 -2.53944659
+v -2.65025043 -1.26533461 -2.50246048
+vt 1.00000000 0.20388399
+vt 0.91799283 0.99996310
+vt 0.75971997 0.99997020
+vt 0.66301221 0.38062021
+vt 0.56979227 0.99997723
+vt 0.00000890 1.00000000
+vt 0.00000000 0.00000000
+vt 0.66301554 0.72102213
+f 7/7 6/6 5/5
+f 1/1 8/8 3/3
+f 3/3 2/2 1/1
+f 7/7 5/5 4/4
+f 8/8 1/1 4/4
+f 1/1 7/7 4/4
+
diff --git a/ai_002_004/background_mesh/26.obj b/ai_002_004/background_mesh/26.obj
new file mode 100644
index 0000000000000000000000000000000000000000..e488b7d81db57d36cd94029dc4410933fd07e1f9
--- /dev/null
+++ b/ai_002_004/background_mesh/26.obj
@@ -0,0 +1,74 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.19954896 -1.27242231 -2.36860228
+v -2.25615573 -1.24293363 -2.34385514
+v -2.25615025 -1.30939877 -2.39963174
+v -2.28435540 -1.30940115 -2.39963317
+v -2.28436089 -1.24293518 -2.34385586
+v -2.31256604 -1.24293685 -2.34385681
+v -2.32666326 -1.30940473 -2.39963555
+v -2.34077120 -1.24293840 -2.34385777
+v -2.34076571 -1.30940592 -2.39963627
+v -2.39717603 -1.30941069 -2.39963937
+v -2.41128421 -1.24294245 -2.34385991
+v -2.41127872 -1.30941188 -2.39964008
+v -2.43948388 -1.30941415 -2.39964151
+v -2.45359182 -1.24294484 -2.34386110
+v -2.45358634 -1.30941534 -2.39964223
+v -2.48179150 -1.30941772 -2.39964390
+v -2.48179698 -1.24294651 -2.34386206
+v -2.53820729 -1.24294972 -2.34386396
+v -2.55230427 -1.30942369 -2.39964771
+v -2.56641245 -1.24295127 -2.34386468
+v -2.56640697 -1.30942488 -2.39964843
+v -2.53820562 -1.32041895 -2.40887427
+v -2.27025676 -1.32041764 -2.40887761
+v -2.58487487 -1.30942643 -2.39964938
+vt 0.00000000 0.61942875
+vt 0.14690746 1.00000000
+vt 0.14689083 0.14221868
+vt 0.22008912 0.14218856
+vt 0.22010575 0.99998069
+vt 0.29330403 0.99995905
+vt 0.32988685 0.14214186
+vt 0.36650231 0.99993825
+vt 0.36648569 0.14212683
+vt 0.51288223 0.14206508
+vt 0.54949832 0.99988657
+vt 0.54948169 0.14205001
+vt 0.62268001 0.14202076
+vt 0.65929550 0.99985647
+vt 0.65927881 0.14200574
+vt 0.73247707 0.14197408
+vt 0.73249376 0.99983478
+vt 0.87889034 0.99979234
+vt 0.91547245 0.14189729
+vt 0.95208865 0.99977309
+vt 0.95207191 0.14188223
+vt 0.87888324 0.00000000
+vt 0.18349980 0.00001701
+vt 1.00000000 0.14186248
+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 13/13 14/14 15/15
+f 16/16 17/17 18/18
+f 19/19 20/20 21/21
+f 21/21 24/24 22/22
+f 23/23 1/1 3/3
+f 4/4 6/6 7/7
+f 12/12 23/23 10/10
+f 22/22 15/15 16/16
+f 16/16 18/18 19/19
+f 19/19 21/21 22/22
+f 4/4 23/23 3/3
+f 23/23 4/4 7/7
+f 15/15 22/22 13/13
+f 16/16 19/19 22/22
+f 9/9 23/23 7/7
+f 13/13 22/22 12/12
+f 10/10 23/23 9/9
+f 23/23 12/12 22/22
+
diff --git a/ai_002_004/background_mesh/27.obj b/ai_002_004/background_mesh/27.obj
new file mode 100644
index 0000000000000000000000000000000000000000..d6d7f517963ed9c4ab7f179637e11d69d81e932e
--- /dev/null
+++ b/ai_002_004/background_mesh/27.obj
@@ -0,0 +1,36 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.19954920 -1.26663935 -2.34049034
+v -2.27425385 -1.24293447 -2.32059646
+v -2.27424765 -1.30940104 -2.37637353
+v -2.30568218 -1.30940366 -2.37637520
+v -2.30568695 -1.24293625 -2.32059741
+v -2.33712006 -1.24293804 -2.32059836
+v -2.33711386 -1.30940628 -2.37637687
+v -2.47856641 -1.30941820 -2.37638450
+v -2.21138525 -1.30939579 -2.37637019
+v -2.60430098 -1.24295330 -2.32060671
+v -2.60429478 -1.30942881 -2.37639117
+v -2.67848206 -1.30943501 -2.37639523
+vt 0.00000000 0.64353746
+vt 0.15598235 1.00000000
+vt 0.15596747 0.00051013
+vt 0.22160208 0.00047074
+vt 0.22161397 0.99997330
+vt 0.28724560 0.99994653
+vt 0.28723073 0.00043139
+vt 0.58258057 0.00025236
+vt 0.02471217 0.00058883
+vt 0.84511346 0.99971741
+vt 0.84509861 0.00009385
+vt 1.00000000 0.00000000
+f 1/1 2/2 3/3
+f 4/4 5/5 6/6
+f 9/9 1/1 3/3
+f 4/4 6/6 7/7
+f 8/8 9/9 3/3
+f 4/4 7/7 8/8
+f 8/8 3/3 4/4
+f 11/11 10/10 12/12
+
diff --git a/ai_002_004/background_mesh/28.obj b/ai_002_004/background_mesh/28.obj
new file mode 100644
index 0000000000000000000000000000000000000000..84c453c1aa5974b1907ed28abdd2ce7ceeac028b
--- /dev/null
+++ b/ai_002_004/background_mesh/28.obj
@@ -0,0 +1,38 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.38206124 -1.24294090 -2.29726529
+v -2.38205576 -1.30941093 -2.35304499
+v -2.43123198 -1.30941510 -2.35304761
+v -2.44762969 -1.24294460 -2.29726744
+v -2.44762421 -1.30941641 -2.35304856
+v -2.61154485 -1.30943024 -2.35305738
+v -2.65024924 -1.28026128 -2.32857919
+v -2.69350505 -1.30943704 -2.35306191
+v -2.75907350 -1.30944264 -2.35306525
+v -2.80038285 -1.28026164 -2.32857704
+v -2.80825305 -1.30944669 -2.35306811
+v -2.36566377 -1.30940950 -2.35304427
+vt 0.03705106 1.00000000
+vt 0.03703658 0.00053912
+vt 0.14814685 0.00047684
+vt 0.18519844 0.99994344
+vt 0.18518397 0.00045620
+vt 0.55555135 0.00024874
+vt 0.64300221 0.43883964
+vt 0.74073482 0.00014518
+vt 0.88888216 0.00006297
+vt 0.98221880 0.43883389
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00055905
+f 12/12 1/1 2/2
+f 3/3 4/4 5/5
+f 6/6 7/7 8/8
+f 9/9 10/10 11/11
+f 12/12 2/2 3/3
+f 3/3 5/5 6/6
+f 8/8 9/9 11/11
+f 12/12 3/3 6/6
+f 6/6 8/8 11/11
+f 11/11 12/12 6/6
+
diff --git a/ai_002_004/background_mesh/29.obj b/ai_002_004/background_mesh/29.obj
new file mode 100644
index 0000000000000000000000000000000000000000..97e1e42fe9f369996472af879f40f72584107b93
--- /dev/null
+++ b/ai_002_004/background_mesh/29.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.19954896 -1.27180243 -2.29819298
+v -2.28412294 -1.24293506 -2.27396679
+v -2.22388458 -1.30939817 -2.32974243
+v -2.28411770 -1.30940318 -2.32974553
+vt 0.00000000 0.56569713
+vt 1.00000000 1.00000000
+vt 0.28773606 0.00007457
+vt 0.99992704 0.00000000
+f 3/3 2/2 4/4
+f 2/2 3/3 1/1
+
diff --git a/ai_002_004/background_mesh/3.obj b/ai_002_004/background_mesh/3.obj
new file mode 100644
index 0000000000000000000000000000000000000000..a77619129758bbd5ea7e631101c3a8c282baca13
--- /dev/null
+++ b/ai_002_004/background_mesh/3.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.26792479 -1.84364104 -2.70830536
+v 2.26792479 -1.84364128 -0.00031709
+v -2.81207514 -1.84393084 -0.00031709
+v -2.81207514 -1.84393060 -2.70846391
+vt 0.00005854 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/30.obj b/ai_002_004/background_mesh/30.obj
new file mode 100644
index 0000000000000000000000000000000000000000..d61319e21917c1059ea36b385c0615f6b299507c
--- /dev/null
+++ b/ai_002_004/background_mesh/30.obj
@@ -0,0 +1,30 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.54597640 -1.26619494 -2.25859642
+v -2.77489209 -1.26619756 -2.25859499
+v -2.80038333 -1.27503049 -2.26600695
+v -2.78919983 -1.30944645 -2.29488873
+v -2.21690917 -1.30939841 -2.29485798
+v -2.19954824 -1.28598857 -2.27521276
+v -2.23121738 -1.26619136 -2.25859880
+v -2.80038285 -1.28599048 -2.27520442
+v -2.76058555 -1.26619732 -2.25859499
+v -2.76058412 -1.30944407 -2.29488730
+vt 0.57657808 0.99991912
+vt 0.95757395 0.99985659
+vt 1.00000000 0.79565233
+vt 0.98138595 0.00000000
+vt 0.02889411 0.00110991
+vt 0.00000000 0.54231679
+vt 0.05270898 1.00000000
+vt 0.99999899 0.54227239
+vt 0.93376285 0.99986249
+vt 0.93375939 0.00005403
+f 4/4 2/2 3/3
+f 1/1 5/5 7/7
+f 5/5 6/6 7/7
+f 2/2 4/4 1/1
+f 5/5 1/1 4/4
+f 8/8 10/10 9/9
+
diff --git a/ai_002_004/background_mesh/31.obj b/ai_002_004/background_mesh/31.obj
new file mode 100644
index 0000000000000000000000000000000000000000..49d2af5156fdd8a79896af81d85b7332401bd5e5
--- /dev/null
+++ b/ai_002_004/background_mesh/31.obj
@@ -0,0 +1,71 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.19954944 -1.26803899 -2.52802300
+v -2.28371549 -1.30939639 -2.56272817
+v -2.29898214 -1.24293554 -2.50695562
+v -2.29897618 -1.30939770 -2.56272888
+v -2.37527966 -1.30940402 -2.56273317
+v -2.39054632 -1.24294078 -2.50695848
+v -2.39054036 -1.30940533 -2.56273389
+v -2.51262593 -1.30941558 -2.56274056
+v -2.52789259 -1.24294865 -2.50696278
+v -2.52788663 -1.30941689 -2.56274128
+v -2.55840826 -1.30941939 -2.56274295
+v -2.57367492 -1.24295127 -2.50696421
+v -2.58892965 -1.30942202 -2.56274462
+v -2.60419631 -1.24295294 -2.50696516
+v -2.60419035 -1.30942321 -2.56274533
+v -2.65025043 -1.26803780 -2.52801490
+v -2.71101522 -1.30943227 -2.56275129
+v -2.71102118 -1.24295902 -2.50696850
+v -2.74154258 -1.24296081 -2.50696945
+v -2.74153662 -1.30943477 -2.56275272
+v -2.80038333 -1.27972913 -2.53782344
+v -2.80038118 -1.31479883 -2.56725287
+v -2.22267652 -1.30939126 -2.56272483
+vt 0.00000000 0.65068012
+vt 0.14008114 0.07517471
+vt 0.16549179 1.00000000
+vt 0.16548033 0.07515736
+vt 0.29247636 0.07506769
+vt 0.31788701 0.99992716
+vt 0.31787553 0.07505034
+vt 0.52106911 0.07490703
+vt 0.54647976 0.99981797
+vt 0.54646832 0.07488967
+vt 0.59726715 0.07485434
+vt 0.62267780 0.99978143
+vt 0.64806551 0.07481800
+vt 0.67347622 0.99975783
+vt 0.67346472 0.07480164
+vt 0.75012600 0.65069413
+vt 0.85125911 0.07467465
+vt 0.85127068 0.99967319
+vt 0.90206903 0.99964863
+vt 0.90205753 0.07464097
+vt 1.00000000 0.48800558
+vt 0.99999565 0.00000000
+vt 0.03849065 0.07524639
+f 2/2 3/3 4/4
+f 5/5 6/6 7/7
+f 8/8 9/9 10/10
+f 11/11 12/12 13/13
+f 13/13 14/14 15/15
+f 15/15 16/16 17/17
+f 17/17 18/18 19/19
+f 20/20 21/21 22/22
+f 23/23 1/1 2/2
+f 22/22 4/4 5/5
+f 22/22 7/7 8/8
+f 22/22 11/11 13/13
+f 22/22 15/15 17/17
+f 17/17 19/19 20/20
+f 22/22 23/23 2/2
+f 7/7 22/22 5/5
+f 11/11 22/22 10/10
+f 17/17 20/20 22/22
+f 4/4 22/22 2/2
+f 15/15 22/22 13/13
+f 10/10 22/22 8/8
+
diff --git a/ai_002_004/background_mesh/32.obj b/ai_002_004/background_mesh/32.obj
new file mode 100644
index 0000000000000000000000000000000000000000..e7f8a429e82f06eed8b74ccfc754f1c916b5335f
--- /dev/null
+++ b/ai_002_004/background_mesh/32.obj
@@ -0,0 +1,11 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.56895018 -1.24295115 -2.20414162
+v -2.56894732 -1.30784309 -2.25859690
+v -2.68263173 -1.30784440 -2.25859594
+vt 0.00003313 1.00000000
+vt 0.00000000 0.00001893
+vt 1.00000000 0.00000000
+f 2/2 1/1 3/3
+
diff --git a/ai_002_004/background_mesh/33.obj b/ai_002_004/background_mesh/33.obj
new file mode 100644
index 0000000000000000000000000000000000000000..18cde4ede35fa597b59bceb12c2b29d0649abbda
--- /dev/null
+++ b/ai_002_004/background_mesh/33.obj
@@ -0,0 +1,28 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.19954896 -1.26626396 -2.20056701
+v -2.24149060 -1.30940223 -2.23676658
+v -2.28996396 -1.30940628 -2.23676920
+v -2.17686796 -1.30939674 -2.23676324
+v -2.45153213 -1.24294460 -2.18099356
+v -2.45152807 -1.30941987 -2.23677802
+v -2.80038285 -1.27863967 -2.21094227
+v -2.82313132 -1.30945110 -2.23679805
+v -2.46768284 -1.30942118 -2.23677897
+v -2.77465987 -1.30944705 -2.23679543
+vt 0.03509656 0.64936554
+vt 0.09999430 0.00073571
+vt 0.17499988 0.00067457
+vt 0.00000000 0.00081675
+vt 0.42500493 1.00000000
+vt 0.42499718 0.00046952
+vt 0.96480072 0.46328405
+vt 1.00000000 0.00000000
+vt 0.44999439 0.00044890
+vt 0.92499739 0.00006114
+f 2/2 3/3 4/4
+f 4/4 1/1 2/2
+f 6/6 5/5 9/9
+f 10/10 7/7 8/8
+
diff --git a/ai_002_004/background_mesh/34.obj b/ai_002_004/background_mesh/34.obj
new file mode 100644
index 0000000000000000000000000000000000000000..39893bff60fcb36c613be22358328b41cac86d1a
--- /dev/null
+++ b/ai_002_004/background_mesh/34.obj
@@ -0,0 +1,26 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -1.65849602 2.30222440 -0.97333395
+v -1.65850306 2.30225992 -1.46444428
+v -1.65850627 2.33222270 -1.45366764
+v -1.65850317 2.30226111 -1.47888982
+v -1.65851605 2.31777835 -2.25857091
+v -1.65850294 2.20256805 -2.27333522
+v -1.65848160 2.18777776 -0.90006042
+v -1.65849471 2.30221796 -0.88666391
+vt 0.06250223 0.79232013
+vt 0.41666713 0.79256612
+vt 0.40889555 1.00000000
+vt 0.42708457 0.79257435
+vt 0.98935270 0.90000099
+vt 1.00000000 0.10239401
+vt 0.00966091 0.00000000
+vt 0.00000000 0.79227561
+f 2/2 3/3 4/4
+f 4/4 5/5 6/6
+f 1/1 7/7 8/8
+f 7/7 1/1 2/2
+f 7/7 4/4 6/6
+f 4/4 7/7 2/2
+
diff --git a/ai_002_004/background_mesh/35.obj b/ai_002_004/background_mesh/35.obj
new file mode 100644
index 0000000000000000000000000000000000000000..b1f0715995f29867c38c638539ee260c51d02272
--- /dev/null
+++ b/ai_002_004/background_mesh/35.obj
@@ -0,0 +1,35 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -1.65851653 2.32222319 -2.25857067
+v -0.20722359 2.30217195 -2.25858116
+v -0.17461348 2.32222247 -2.25858116
+v -0.14944148 2.30216622 -2.25858164
+v -0.17461261 2.26444387 -2.25858188
+v -0.14944255 2.20249248 -2.25858259
+v -0.17461134 2.17777753 -2.25858259
+v -0.20722032 2.20249534 -2.25858212
+v -1.62277722 2.20256686 -2.25857210
+v -1.65849984 2.17777538 -2.25857210
+v -1.68055725 2.20256972 -2.25857162
+vt 0.01439520 1.00000000
+vt 0.96226138 0.86118692
+vt 0.98355973 0.99999505
+vt 1.00000000 0.86114734
+vt 0.98356026 0.59999865
+vt 0.99999928 0.17111436
+vt 0.98356110 0.00001485
+vt 0.96226358 0.17113416
+vt 0.03773720 0.17162932
+vt 0.01440610 0.00000000
+vt 0.00000000 0.17164913
+f 5/5 3/3 4/4
+f 8/8 6/6 7/7
+f 9/9 10/10 11/11
+f 9/9 1/1 2/2
+f 3/3 5/5 2/2
+f 6/6 8/8 5/5
+f 1/1 9/9 11/11
+f 2/2 5/5 8/8
+f 8/8 9/9 2/2
+
diff --git a/ai_002_004/background_mesh/36.obj b/ai_002_004/background_mesh/36.obj
new file mode 100644
index 0000000000000000000000000000000000000000..aab93645866fb0025bc2b163ba46559829e37575
--- /dev/null
+++ b/ai_002_004/background_mesh/36.obj
@@ -0,0 +1,26 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -0.20500141 2.30207324 -0.90006971
+v -1.65849733 2.32222295 -0.90005922
+v -1.67833495 2.20260978 -0.90006012
+v -1.65848053 2.17777514 -0.90006047
+v -1.62055492 2.20260692 -0.90006053
+v -0.20499814 2.20253515 -0.90007061
+v -0.17462364 2.17777777 -0.90007102
+v -0.16166508 2.30206895 -0.90007001
+vt 0.02857335 0.86050528
+vt 0.98692030 1.00000000
+vt 1.00000000 0.17192808
+vt 0.98690921 0.00000000
+vt 0.96190333 0.17190827
+vt 0.02857118 0.17141145
+vt 0.00854407 0.00001816
+vt 0.00000000 0.86047554
+f 5/5 2/2 3/3
+f 3/3 4/4 5/5
+f 6/6 7/7 8/8
+f 2/2 5/5 1/1
+f 1/1 6/6 8/8
+f 6/6 1/1 5/5
+
diff --git a/ai_002_004/background_mesh/37.obj b/ai_002_004/background_mesh/37.obj
new file mode 100644
index 0000000000000000000000000000000000000000..80f288a1691b1f0e55df4ccb2a3f94f192f39590
--- /dev/null
+++ b/ai_002_004/background_mesh/37.obj
@@ -0,0 +1,20 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 2.80059481 0.06204206 -2.70293236
+v 2.80059457 0.06204206 -2.80429578
+v 2.80039978 -0.88161993 -2.80429578
+v 2.80038953 -0.93124563 -2.83663416
+v 2.80037856 -0.98480564 -2.77776861
+v 2.80038548 -0.95204252 -2.70293236
+vt 0.00000000 1.00000000
+vt 0.75813055 1.00000000
+vt 0.75813055 0.09856806
+vt 1.00000000 0.05116317
+vt 0.55972511 0.00000000
+vt 0.00000000 0.03129696
+f 1/1 2/2 3/3
+f 3/3 4/4 5/5
+f 3/3 6/6 1/1
+f 6/6 3/3 5/5
+
diff --git a/ai_002_004/background_mesh/38.obj b/ai_002_004/background_mesh/38.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2be49f0ebc718607dd034946b46f3009aefa3552
--- /dev/null
+++ b/ai_002_004/background_mesh/38.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.00000310 0.08208328 0.09458333
+v 3.00000262 0.08208328 -0.00031709
+v 2.99992943 -0.27208334 -0.00031709
+v 2.99993014 -0.27208334 0.09458333
+vt 0.00000000 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000004
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/39.obj b/ai_002_004/background_mesh/39.obj
new file mode 100644
index 0000000000000000000000000000000000000000..5d2775ea79d5dff45269953655babd6a2f7f7e8a
--- /dev/null
+++ b/ai_002_004/background_mesh/39.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 1.77750158 3.42591619 -2.80250001
+v 1.77750158 3.42591619 -2.70293236
+v -0.03750157 3.42590451 -2.70293236
+v -0.03750157 3.42590427 -2.80250001
+vt 0.00000000 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/4.obj b/ai_002_004/background_mesh/4.obj
new file mode 100644
index 0000000000000000000000000000000000000000..049f9f8c6264742ef8b6268b5fa591f3e23bacd4
--- /dev/null
+++ b/ai_002_004/background_mesh/4.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 3.00069213 3.42206573 -0.00031709
+v -3.00262928 3.42588902 -0.00031709
+v -3.00262904 -3.98206496 -0.00031709
+v 2.99916339 -3.98207331 -0.00031709
+vt 0.00000000 0.99948388
+vt 1.00000000 1.00000000
+vt 0.99999994 0.00000113
+vt 0.00025465 0.00000000
+f 1/1 2/2 3/3
+f 3/3 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/40.obj b/ai_002_004/background_mesh/40.obj
new file mode 100644
index 0000000000000000000000000000000000000000..53b4067e8a63616883e05e64826d859dd05eb9a1
--- /dev/null
+++ b/ai_002_004/background_mesh/40.obj
@@ -0,0 +1,14 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -0.17461312 2.30216908 -2.26571536
+v -0.17462540 2.30207062 -0.90857053
+v -0.17462406 2.20253372 -0.89428478
+v -0.17461164 2.20249343 -2.26571536
+vt 0.00000000 1.00000000
+vt 0.98958331 0.99901211
+vt 1.00000000 0.00040424
+vt 0.00000000 0.00000000
+f 4/4 2/2 3/3
+f 2/2 4/4 1/1
+
diff --git a/ai_002_004/background_mesh/41.obj b/ai_002_004/background_mesh/41.obj
new file mode 100644
index 0000000000000000000000000000000000000000..52dbb7338aa33b82bdf6807a07493c5d6580554d
--- /dev/null
+++ b/ai_002_004/background_mesh/41.obj
@@ -0,0 +1,19 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -1.92249978 -1.73750007 -1.45362973
+v -1.60750020 -1.73750007 -1.45363474
+v -1.60749757 -1.84386206 -1.45363367
+v -1.65802431 -1.81249702 -1.45363319
+v -1.69749832 -1.84386718 -1.45363224
+v -1.92249799 -1.84387994 -1.45362866
+vt 0.00000000 1.00000000
+vt 0.99999166 1.00000000
+vt 1.00000000 0.00016809
+vt 0.83959877 0.29500806
+vt 0.71428531 0.00011990
+vt 0.00000568 0.00000000
+f 2/2 3/3 4/4
+f 1/1 5/5 6/6
+f 5/5 1/1 4/4
+
diff --git a/ai_002_004/background_mesh/42.obj b/ai_002_004/background_mesh/42.obj
new file mode 100644
index 0000000000000000000000000000000000000000..294539a87f86c36aa733fdad001440a7010a72c2
--- /dev/null
+++ b/ai_002_004/background_mesh/42.obj
@@ -0,0 +1,31 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v 0.35360551 2.20253325 -0.00031709
+v 0.35360551 2.20245385 -2.70293236
+v -2.80360532 2.20261335 -2.70293236
+v -2.80360532 2.20269275 -0.00031709
+v -1.51523674 2.20260143 -0.90006131
+v -0.17023671 2.20253348 -0.90007085
+v -0.17461154 2.20249295 -2.27734232
+v -1.65850306 2.20256805 -2.27734232
+v -1.67097366 2.20260930 -0.90006018
+vt 0.00000000 1.00000000
+vt 1.00000000 1.00000000
+vt 1.00000000 0.00000000
+vt 0.00000000 0.00000000
+vt 0.33291614 0.40807176
+vt 0.33291966 0.83408064
+vt 0.84252661 0.83269501
+vt 0.84252661 0.36269426
+vt 0.33291572 0.35874438
+f 4/4 5/5 9/9
+f 5/5 4/4 1/1
+f 5/5 1/1 6/6
+f 3/3 4/4 9/9
+f 2/2 6/6 1/1
+f 3/3 9/9 8/8
+f 6/6 2/2 7/7
+f 2/2 3/3 8/8
+f 8/8 7/7 2/2
+
diff --git a/ai_002_004/background_mesh/43.obj b/ai_002_004/background_mesh/43.obj
new file mode 100644
index 0000000000000000000000000000000000000000..cdb75740e852c347e962ff13588bffac7e985fea
--- /dev/null
+++ b/ai_002_004/background_mesh/43.obj
@@ -0,0 +1,62 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
+v -2.65028000 -0.74477386 -1.56999993
+v -2.65028000 -0.74477243 -1.59857142
+v -2.70499992 -0.74476755 -1.59857142
+v -2.70499992 -0.74476898 -1.56999993
+v -2.65028000 -0.74480730 -0.91285610
+v -2.65028000 -0.74473971 -2.24142933
+v -2.76214314 -0.74472886 -2.25859022
+v -2.80041361 -0.74472779 -2.21285796
+v -2.76211190 -0.74474436 -1.95094752
+v -2.76214218 -0.74475414 -1.76291990
+v -2.80041361 -0.74475318 -1.71285725
+v -2.80041361 -0.74476409 -1.49857128
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diff --git a/ai_002_004/background_mesh/5.obj b/ai_002_004/background_mesh/5.obj
new file mode 100644
index 0000000000000000000000000000000000000000..47742a24b49fadae56972ac793a39084d6b16ea9
--- /dev/null
+++ b/ai_002_004/background_mesh/5.obj
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+# https://github.com/mikedh/trimesh
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diff --git a/ai_002_004/background_mesh/6.obj b/ai_002_004/background_mesh/6.obj
new file mode 100644
index 0000000000000000000000000000000000000000..ba80d6f37a28c575681fae86d33fc83c548c0f9d
--- /dev/null
+++ b/ai_002_004/background_mesh/6.obj
@@ -0,0 +1,69 @@
+# https://github.com/mikedh/trimesh
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diff --git a/ai_002_004/background_mesh/7.obj b/ai_002_004/background_mesh/7.obj
new file mode 100644
index 0000000000000000000000000000000000000000..8ba37dd41634ed5ba081c6f20535a1cfd9410f3e
--- /dev/null
+++ b/ai_002_004/background_mesh/7.obj
@@ -0,0 +1,92 @@
+# https://github.com/mikedh/trimesh
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+usemtl material_0
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diff --git a/ai_002_004/background_mesh/8.obj b/ai_002_004/background_mesh/8.obj
new file mode 100644
index 0000000000000000000000000000000000000000..58887be72ec7d34f3b18ecef8ba656300b83b475
--- /dev/null
+++ b/ai_002_004/background_mesh/8.obj
@@ -0,0 +1,125 @@
+# https://github.com/mikedh/trimesh
+mtllib material.mtl
+usemtl material_0
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