Add obj file that is loaded as trimesh scene

test/test_data/scene.mtl

@@ -0,0 +1,18 @@
+newmtl Box1
+# ambient color
+Ka  1.0 0.5 0.5
+# diffuse color
+Kd  1.0 0.5 0.5
+# specular color
+Ks  0.0 0.0 0.0
+# transparency, opaque in this case
+d  1.0
+# illumination model: highlight on
+illum 2
+
+newmtl Box2
+Ka  0.5 1.0 0.5
+Kd  0.5 1.0 0.5
+Ks  0.0 0.0 0.0
+d  1.0
+illum 2

test/test_data/scene.obj

@@ -0,0 +1,55 @@
+mtllib scene.mtl
+
+g box1
+
+# vertices
+v 0. 0. 0.
+v 1. 0. 0.
+v 0. 0. 1.
+v 1. 0. 1.
+v 0. 1. 0.
+v 1. 1. 0.
+v 0. 1. 1.
+v 1. 1. 1.
+
+usemtl Box1
+# faces
+f 5 8 6
+f 5 7 8
+f 1 3 5
+f 3 7 5
+f 1 2 3
+f 2 4 3
+f 2 6 8
+f 2 8 4
+f 3 4 8
+f 3 8 7
+f 1 5 2
+f 2 5 6
+
+g box2
+
+# vertices
+v 2. 0. 0.
+v 3. 0. 0.
+v 2. 0. 1.
+v 3. 0. 1.
+v 2. 1. 0.
+v 3. 1. 0.
+v 2. 1. 1.
+v 3. 1. 1.
+
+usemtl Box2
+# faces
+f 13 16 14
+f 13 15 16
+f 9 11 13
+f 11 15 13
+f 9 10 11
+f 10 12 11
+f 10 14 16
+f 10 16 12
+f 11 12 16
+f 11 16 15
+f 9 13 10
+f 10 13 14