scene2.test

# Test Scene 2
# A simple scene to test ray-surface intersections
# This defines a simple dice
# There are no transformations in this scene

# Note that I use ambient to set the color of the various materials.
# It is unlikely that a ray tracing program will be able to do the same or 
# indeed to interpret multiple instances of the ambient keyword.  
# To get the same effect, you can assign manually a color to each group of 
# primitives.  In any case, getting the geometry right is the point of this 
# exercise, not the shading.

size 640 480 

# There are 3 camera positions.  Make images for all 3

camera -2 -2 2 0 0 0 1 1 2 60
#camera +2 +2 2 0 0 0 -1 -1 2 60
#camera -2 -2 -2 0 0 0 -1 -1 2 60


# Now specify the geometry.  First the cube, then the spheres

maxverts 8

vertex -1 -1 -1
vertex +1 -1 -1 
vertex +1 +1 -1 
vertex -1 +1 -1 
vertex -1 -1 +1
vertex +1 -1 +1 
vertex +1 +1 +1
vertex -1 +1 +1

# Now, I actually define the cube.  Note that to avoid lighting/material 
# calculations, I am just using ambient to define the colors.
# No lighting calculations should be performed since I haven't defined any 
# lights.

ambient .5 0 .5 
# face -Y
tri 0 1 5 
tri 0 5 4 
ambient .5 1 .5 
# face +Y
tri 3 7 6
tri 3 6 2
ambient 1 .5 .5 
# face +X
tri 1 2 6
tri 1 6 5 
ambient 0 .5 .5 
# face -X
tri 0 7 3 
tri 0 4 7 
ambient .5 .5 0
# face -Z
tri 0 3 2 
tri 0 2 1
ambient .5 .5 1
# face +Z
tri 4 5 6 
tri 4 6 7 

# Make spheres
ambient 1 1 1

sphere 1 0 0 0.15

sphere -.5 1 -.5 0.15
sphere +.5 1 +.5 0.15

sphere 0 0 1 0.15
sphere -.5 -.5 1 0.15
sphere +.5 +.5 1 0.15

sphere -1 -.5 -.5 0.15
sphere -1 -.5 +.5 0.15
sphere -1 +.5 +.5 0.15
sphere -1 +.5 -.5 0.15

sphere -.5 -1 -.5 0.15
sphere -.5 -1 +.5 0.15
sphere +.5 -1 +.5 0.15
sphere +.5 -1 -.5 0.15
sphere  0 -1 0 0.15

sphere -.5 -.5 -1 0.15
sphere -.5   0 -1 0.15
sphere -.5 +.5 -1 0.15
sphere +.5 -.5 -1 0.15
sphere +.5   0 -1 0.15
sphere +.5 +.5 -1 0.15