I would like to render the volume that is shaded by an object (e.g. cube), not only the 2D shadow cast on the ground (as in the attached image).
I understand that in reality the shaded volume is not visible as shaded (only when it "reaches" a surface like the ground plane it becomes evident), but in my project I need to somehow show the shaded volume as well (preferably semi-transparently).
Is there an easy way to do it? I am using the lamp of type Sun and the Blender Render engine.