For light sources with simple geometry why do we choose to sample rather then directly calculate the area of the light source in view of a surface point sample?

chelseayer

I think this is possible but this would only limit to direct lighting, and the calculation would end up heavy even for simple geometry since each pixel (with different angle to the light source) will have different integrations to work with.

For light sources with simple geometry why do we choose to sample rather then directly calculate the area of the light source in view of a surface point sample?

I think this is possible but this would only limit to direct lighting, and the calculation would end up heavy even for simple geometry since each pixel (with different angle to the light source) will have different integrations to work with.