A viewing frustum is the region in the modeled world that you can see at different distances away from your eye. In other words, it tells what direction a light ray comes in will contribute the image.
Does it mean that if a light travels at a direction that doesn't fit the viewing frustum, the light won't contribute to the image? Will the light refract at the viewport of the viewing frustum just like light refracts at the surface of our eyes?
Thank you very much!