examples: add cornell box example

pathtracer/examples/cornell-box.mtl

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+# The original Cornell Box in OBJ format.
+# Note that the real box is not a perfect cube, so
+# the faces are imperfect in this data set.
+#
+# Created by Guedis Cardenas and Morgan McGuire at Williams College, 2011
+# Released into the Public Domain.
+#
+# http://graphics.cs.williams.edu/data
+# http://www.graphics.cornell.edu/online/box/data.html
+#
+
+newmtl leftWall
+  Ns 10.0000
+  Ni 1.5000
+  illum 2
+  Ka 0.63 0.065 0.05 # Red
+  Kd 0.63 0.065 0.05
+  Ks 0 0 0
+  Ke 0 0 0
+
+
+newmtl rightWall
+  Ns 10.0000
+  Ni 1.5000
+  illum 2
+  Ka 0.14 0.45 0.091 # Green
+  Kd 0.14 0.45 0.091
+  Ks 0 0 0
+  Ke 0 0 0
+
+
+newmtl floor
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.725 0.71 0.68 # White
+  Kd 0.725 0.71 0.68
+  Ks 0 0 0
+  Ke 0 0 0
+
+
+newmtl ceiling
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.725 0.71 0.68 # White
+  Kd 0.725 0.71 0.68
+  Ks 0     0    0
+  Ke 0     0    0
+
+
+newmtl backWall
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.725 0.71 0.68 # White
+  Kd 0.725 0.71 0.68
+  Ks 0 0 0
+  Ke 0 0 0
+
+
+newmtl shortBox
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.725 0.71 0.68 # White
+  Kd 0.725 0.71 0.68
+  Ks 0 0 0
+  Ke 0 0 0
+
+
+newmtl tallBox
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.725 0.71 0.68 # White
+  Kd 0.725 0.71 0.68
+  Ks 0 0 0
+  Ke 0 0 0
+
+newmtl light
+  Ns 10.0000
+  Ni 1.0000
+  illum 2
+  Ka 0.78 0.78 0.78 # White
+  Kd 0.78 0.78 0.78
+  Ks 0 0 0
+  Ke 17 12 4

pathtracer/examples/cornell-box.obj

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+# The original Cornell Box in OBJ format.
+# Note that the real box is not a perfect cube, so
+# the faces are imperfect in this data set.
+#
+# Created by Guedis Cardenas and Morgan McGuire at Williams College, 2011
+# Released into the Public Domain.
+#
+# http://graphics.cs.williams.edu/data
+# http://www.graphics.cornell.edu/online/box/data.html
+#
+
+mtllib cornell-box.mtl
+
+## Object floor
+v  -1.01  0.00   0.99
+v   1.00  0.00   0.99
+v   1.00  0.00  -1.04
+v  -0.99  0.00  -1.04
+
+g floor
+usemtl floor
+f -4 -3 -2 -1
+
+## Object ceiling
+v  -1.02  1.99   0.99
+v  -1.02  1.99  -1.04
+v   1.00  1.99  -1.04
+v   1.00  1.99   0.99
+
+g ceiling
+usemtl ceiling
+f -4 -3 -2 -1
+
+## Object backwall
+v  -0.99  0.00  -1.04
+v   1.00  0.00  -1.04
+v   1.00  1.99  -1.04
+v  -1.02  1.99  -1.04
+
+g backWall
+usemtl backWall
+f -4 -3 -2 -1
+
+## Object rightwall
+v	1.00  0.00  -1.04
+v	1.00  0.00   0.99
+v	1.00  1.99   0.99
+v	1.00  1.99  -1.04
+
+g rightWall
+usemtl rightWall
+f -4 -3 -2 -1
+
+## Object leftWall
+v  -1.01  0.00   0.99
+v  -0.99  0.00  -1.04
+v  -1.02  1.99  -1.04
+v  -1.02  1.99   0.99
+
+g leftWall
+usemtl leftWall
+f -4 -3 -2 -1
+
+## Object shortBox
+usemtl shortBox
+
+# Top Face
+v	0.53  0.60   0.75
+v	0.70  0.60   0.17
+v	0.13  0.60   0.00
+v  -0.05  0.60   0.57
+f -4 -3 -2 -1
+
+# Left Face
+v  -0.05  0.00   0.57
+v  -0.05  0.60   0.57
+v   0.13  0.60   0.00
+v   0.13  0.00   0.00
+f -4 -3 -2 -1
+
+# Front Face
+v	0.53  0.00   0.75
+v	0.53  0.60   0.75
+v  -0.05  0.60   0.57
+v  -0.05  0.00   0.57
+f -4 -3 -2 -1
+
+# Right Face
+v	0.70  0.00   0.17
+v	0.70  0.60   0.17
+v	0.53  0.60   0.75
+v	0.53  0.00   0.75
+f -4 -3 -2 -1
+
+# Back Face
+v	0.13  0.00   0.00
+v	0.13  0.60   0.00
+v	0.70  0.60   0.17
+v	0.70  0.00   0.17
+f -4 -3 -2 -1
+
+# Bottom Face
+v	0.53  0.00   0.75
+v	0.70  0.00   0.17
+v	0.13  0.00   0.00
+v  -0.05  0.00   0.57
+f -12 -11 -10 -9
+
+g shortBox
+usemtl shortBox
+
+## Object tallBox
+usemtl tallBox
+
+# Top Face
+v	-0.53  1.20   0.09
+v	 0.04  1.20  -0.09
+v	-0.14  1.20  -0.67
+v	-0.71  1.20  -0.49
+f -4 -3 -2 -1
+
+# Left Face
+v	-0.53  0.00   0.09
+v	-0.53  1.20   0.09
+v	-0.71  1.20  -0.49
+v	-0.71  0.00  -0.49
+f -4 -3 -2 -1
+
+# Back Face
+v	-0.71  0.00  -0.49
+v	-0.71  1.20  -0.49
+v	-0.14  1.20  -0.67
+v	-0.14  0.00  -0.67
+f -4 -3 -2 -1
+
+# Right Face
+v	-0.14  0.00  -0.67
+v	-0.14  1.20  -0.67
+v	 0.04  1.20  -0.09
+v	 0.04  0.00  -0.09
+f -4 -3 -2 -1
+
+# Front Face
+v	 0.04  0.00  -0.09
+v	 0.04  1.20  -0.09
+v	-0.53  1.20   0.09
+v	-0.53  0.00   0.09
+f -4 -3 -2 -1
+
+# Bottom Face
+v	-0.53  0.00   0.09
+v	 0.04  0.00  -0.09
+v	-0.14  0.00  -0.67
+v	-0.71  0.00  -0.49
+f -8 -7 -6 -5
+
+g tallBox
+usemtl tallBox
+
+## Object light
+v	-0.24  1.98   0.16
+v	-0.24  1.98  -0.22
+v	 0.23  1.98  -0.22
+v	 0.23  1.98   0.16
+
+g light
+usemtl light
+f -4 -3 -2 -1

pathtracer/examples/cornell-box.yaml

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+reflection_limit: 5
+
+camera:
+  origin: [0.0, 1.0, 0.0]
+  forward: [ 0.0, 0.0, 1.0]
+  up: [0.0, 1.0, 0.0]
+  fov: 90.0
+  distance_to_image: 1.0
+  x: 2160
+  y: 2160
+
+lights:
+  ambients:
+    - color: {r: 0.1, g: 0.1, b: 0.1}
+  points:
+    - position: [-0.5, 1.0, 1.8]
+      color: {r: 1.0, g: 1.0, b: 1.0}
+
+meshes:
+  - obj_file: "pathtracer/examples/cornell-box.obj"
+    translation: [0.0, 0.0, 1.0]
+    rotation: [0, 180, 0]