How can i render a character + the shadow it cast on a surface but not the surface itself?
I would use it to
Render my background only once (if nothing moves in background) so i would be saving a lot of time
Better effects with transparency gif
Cycles Render Select the surface object, go to Object / Cycles settings and check Shadow Catcher. In Render / Film, check Transparent.
Blender Render Select the surface object, go to Material / Shadow, check Shadows Only. In Render / Shading / Alpha, select Transparent.