The project description recommends an order of implementation of
the project features. These test files and resulting images correspond
to this order.
Test 0.
For this test you need to cast rays, compute interesection points for
spheres and triangles, and compute ambient color.
Test file:
r0.ray
Image:
Test 1.
For this test you need to implement diffuse lighting for a directional
light. The direction of the light is constant throughout the scene. The
reflection at a point on a surface depends on the angle between the surface
normal and the direction of the light. Notice the shading on the
sphere. At this point we have not implemented shadows.
Test file:
r1.ray
Image: 
Using the same test file with shadows implemented produces the following
image. If you run into problems with "holey" pictures when you implement
shadows see the Project2-FAQ.
Image with shadows: 
Test 2.
For this test you need to implement diffuse lighting for a point light.
The reflection at a point on a surface depends on the angle between the
surface normal at the point and the direction of the light at the point.
The direction of the light at the point is the normalized vector
from the point to the light poisition. In this scene the light is
positioned at (-5,5,5). Notice the highlights.
Test file:
r2.ray
Image - no shadows: 
Image - shadows: 
Test 3.
This is similar to the last test but we've added attenuation factors.
Notice how the light drops off.
Test file: r3.ray
Image -no shadows: 
Test 4.
For this test you need to implement diffuse lighting for a spot light.
Here the spot is situated at (4,0,1).
Test file: r4.ray
Image: 
Test 5.
This combines the lights of the previous tests and includes shadows.
Test file: r5.ray
Image: 
Test 6.
For this test you need to implement specular lighting for directional
lights. The reflection at a point on a surface depends on the
direction of the light, direction of camera, and the unit normal.
Test file: r6.ray
Image: 
Test 7.
For this test you need to implement specular lighting for point lights.
Test file: r7.ray
Image: 
Test 8.
For this test you need to implement specular light for spot lights.
Test file: r8.ray
Image 
Test 9.
A combination of the previous effects.
Test file r9.ray
Image: 
Test 10.
For this test you need to implement transmission through semi-transparent objects and recursive ray casting.
Test file r10.ray
Image - rlim=1: 
Image - rlim=2: 