Stencil shadows meant to look like this?

Posts: 49
Joined: 2006.07
Post: #1
I just implemented some basic z-pass stencil shadows, and am a bit disappointed with how they handle self-shadowing curves. The problem is that each polygon of the curve is either fully in shadow or fully out of shadow so the geometry becomes a lot more obvious... see the jagged line in this screenshot. Is that just a limitation of the algorithm or is it just my implementation of it?
[Image: shadow_sample.jpg]
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Posts: 5,143
Joined: 2002.04
Post: #2
You need to make your lighting equation so that the far side of the object is completely dark; then you'll get a smooth line.
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Posts: 1,140
Joined: 2005.07
Post: #3
Alternately, you could render your scene once only with ambient lighting, then another time after the stencil shadows so only the unshadowed parts get light. That way self-shadowing only looks different if the part that's being shadowed would usually be lit.
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