I want to know if it is possible to measure the volume of a rendered shadow’s shape. For example, the attached image shows a point light source shining on a square and casting a shadow onto the plane below it. I want to measure the area of that black shadow shape. Any ideas?
Also, this example is a very simplistic shape, not nearly as complex as the shapes I need to calculate this for. So doing something like tracing the shadow outline in a rendered view-port with a poly-line won’t work for my real issue.