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qLab / qLib

A procedural asset library for SideFX Houdini. https://www.facebook.com/qLibHoudini
http://qlab.github.io/qLib
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Peak qL SOP zeroes out N attrib if not used. #47

Closed gadfly16 closed 11 years ago

gadfly16 commented 11 years ago

For example if the "Vector Attrib" param is "up" and both the pre- and post-compute normals are toggled off N will be (0,0,0) regardless its value before applying the operator.

johnnyquest commented 11 years ago

That's a current Houdini VOPSOP "feature", might worth a try to report to SideFX first.

gadfly16 commented 11 years ago

It's seems to be simply fixable by connecting the incoming global N to the outgoing global N in the processing VOP SOP. Since you do the post calculations of normals in a separate OP I think this way the asset works as advertised.

The logic is the following. In VOP SOP-s if you don't connect an explicit output into the N output the operator will recompute point normals if they are present. So if you want to bypass you have to connect the incoming N to the outgoing one to leave it intact.

On Tue, Jul 16, 2013 at 1:50 PM, Imre Tuske notifications@github.comwrote:

That's a current Houdini VOPSOP "feature", might worth a try to report to SideFX first.

— Reply to this email directly or view it on GitHubhttps://github.com/qLab/qLib/issues/47#issuecomment-21036875 .

johnnyquest commented 11 years ago

If you connect global/outgoing N in VOPs, it will always generate N, even if it wasn't there before. (Which is the same behaviour as in H11 -- I thought it worked better now). Anyway, I put an internal workaround in the asset -- "dev" branch as usual.