Errors

Some common (and less common) errors

Phong illumination, diffuse incorrect:

(think about the computed intensity values)

Phong illumination, intensity too high:

(think about the deriving correct material values and normalized vectors)

Normal encoding problems:

(think about the value ranges)

z-buffer encoding:

(think about the value ranges)

Shadow Rays:

(think about numerical issues)

Intersection:

Missing pixel:

(check out this note)