On 13/8/12 10:35 AM, [email protected] wrote:
Hello all, I have a multipass render from VRAY and I can't seem to get it
looking like the beauty pass when i split into passes and comp back
together in Nuke.
The short answer is:
You can only factor out additions from a 3D render.
A longer answer: multiplications are impossible to factor out, in theory.
In practice, it will work in some cases (assuming you have no semi
opaque fragments, i.e. due to motion blur etc.) -- the error will only
be on such pixels and typically around 10% (but it can be /much/ larger,
depending on the input).
This means if you try to factor out stuff like occlusion/shadows, your
beauty will /never/ match your comped passes.
This is /very/ basic comp math. I suggest looking at how an OVER
operation works, mathematically, to understand why this indeed so.
.mm
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