Coloring form shadow.

[FLCL]

Renderman can output various secondary passes when it renders the main primary pass. So you can definately use your compositing software for that. Personally i'd do the shadows as a separate render, and just render them on their own, ie white shadows on a black background. You can then colour them or change their alue in your compositing package.

[azazel]

Colors in shadows come from the fill light. Outdoor shadows have usually a blue tint, due to sky acting as a giant fill light. Same thing in cg, best way to color shadows is adding colored fill lights, like a lightdome or skylight (or just a few well placed lights, depends on situation) for outdoor scenes.

[jeremybirn]

I can also put bounce light to emulate blue bounce light from the sky or whatever. But I have to put a lot of lights.

You're on the right track. Colored bounce lights are the more natural way to add color to your shadow. As alternatives to adding a lot of bounce lights, people sometimes use image based lighting to create fill light from a dome environment surrounding the scene, or use global illumination if you can afford the render time.

I think every company uses compositing software for some things, but you'd be amazed what some people manage to render all in one pass.

-jeremy

[jdexforwords]

Thank you guys. Now I'm thinking what kind of light is appropriate for bouncing light.

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