Noetigenfalls
12-10-2009, 11:01 PM
Hi everyone!
scene: A complex object (animated, a helicopter for example) - composed of a groups of surfaces parented under a controlshape - casts shadows onto a ground plane, that has mip_matteshadow on it with an mib_color_alpha plugged into the backround. The scene is rendered with mentalray.
I would like to render the shadow (and its alpha) that is cast onto the plane without rendering the object itself.
questions:
1. Normally I would switch off primary visibility on the object. But since the object consists of a few groups containing lots of surfaces/objects, I will have to jump into every single shapenode to turn off primary visibilty. How do I turn off primary visibility on all the subgroups at once?
2. Is "primary visibilty" the correct approach? If I use a shadowpass instead, How do I render ONLY the shadow on the groundplane, WITHOUT the shadows, that the object casts on itself?
I did a few tutorials on the subject of renderlayers/passes, but somehow none of those covered this exact situation.
Help!
scene: A complex object (animated, a helicopter for example) - composed of a groups of surfaces parented under a controlshape - casts shadows onto a ground plane, that has mip_matteshadow on it with an mib_color_alpha plugged into the backround. The scene is rendered with mentalray.
I would like to render the shadow (and its alpha) that is cast onto the plane without rendering the object itself.
questions:
1. Normally I would switch off primary visibility on the object. But since the object consists of a few groups containing lots of surfaces/objects, I will have to jump into every single shapenode to turn off primary visibilty. How do I turn off primary visibility on all the subgroups at once?
2. Is "primary visibilty" the correct approach? If I use a shadowpass instead, How do I render ONLY the shadow on the groundplane, WITHOUT the shadows, that the object casts on itself?
I did a few tutorials on the subject of renderlayers/passes, but somehow none of those covered this exact situation.
Help!