- Mon Aug 11, 2008 12:52 pm
#278001
Hi!
Is there a way to make an object hidden to alpha?
Basically what I want to do in one pass is:
- Render an object standing on the floor.
- Render a shadow channel with shadow enabled for the floor texture.
- Render an alpha channel without the floor.
In post production I want to cut out the object with my alpha and add the shadow channel to the background. This works if I render first the Render and the shadow channel with the floor geometry and then the alpha channel without floor. Because this will be an animation, it would be great if that worked in only one render pass too!
I tried hidden from camera for the ground plane, but then the shadow channel isn't rendering the shadow on the floor. Is there a function like "hidden to alpha" or an other way to do what I want?
Thanks, Andras
Is there a way to make an object hidden to alpha?
Basically what I want to do in one pass is:
- Render an object standing on the floor.
- Render a shadow channel with shadow enabled for the floor texture.
- Render an alpha channel without the floor.
In post production I want to cut out the object with my alpha and add the shadow channel to the background. This works if I render first the Render and the shadow channel with the floor geometry and then the alpha channel without floor. Because this will be an animation, it would be great if that worked in only one render pass too!
I tried hidden from camera for the ground plane, but then the shadow channel isn't rendering the shadow on the floor. Is there a function like "hidden to alpha" or an other way to do what I want?
Thanks, Andras