Calculation mistake of diffuse coloring on pixels with multiple objects
I am making a raytracer and I added diffuse coloring. Actually, it is working but if there are multiple objects in a pixel it doesn't give correct result. However, If I remove one object and render image it gives correct result. By the way, sphere is front of mesh I checked it. I mean
It adds just ambient lighting because the diffuse color function returns zero since N.L is negative.
What can I do? I mean is it a common mistake for ray tracing?
Solution
You might want to check for the part that intersects your ray with the sphere, and the plane, and returns the closest hit.
For the black pixels on the bottom sphere, the following should happen:
- calculate intersection with sphere, get back a hit with distance d0
- calculate intersection with plane, get back a hit with distance d1
- whichever distance is smaller (d0 or d1) is the hit you want to use for shading your pixel. so among your hits, find the one with minimum distance. if the distance is infinity then return the background color (black in your case)
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