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On Tue, 22 Jun 1999 00:37:05 -0400, Mark Wagner wrote:
>I was rendering a scene using the SuperPatch, and when I looked at the
>rendering statistics, they indicated that there was a CSG Merge in the
>scene, when I know that I didn't put one in. Is this really an error, or is
>it just the way POV does things? Here is the simplest code I could create
>that has this possible error:
It's just the way POV does things. Here's why:
difference {
object {A}
intersection {
object {B}
object {C}
}
}
is represented internally as
intersection {
object {A}
intersection {
object {B}
object {C}
inverse
}
}
which POV distills to
intersection {
object {A}
merge {
object {B inverse}
object {C inverse}
}
}
Earlier versions of POV would have used union instead of
merge, but that can lead to weird artifacts if you're
dealing with transparent surfaces.
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