While point light sources only require one ray to check whether a surface point is in the shadow, area light sources require more rays. This can be computationally expensive, but the more sample points we test from the light area, the closer our shadow approximation will be. These methods allow soft shadows as opposed to hard shadows.
While point light sources only require one ray to check whether a surface point is in the shadow, area light sources require more rays. This can be computationally expensive, but the more sample points we test from the light area, the closer our shadow approximation will be. These methods allow soft shadows as opposed to hard shadows.