normals re-orient themselves with xform?

Forums Technical Discussion normals re-orient themselves with xform?

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neonshaun: Member; 31 posts; Joined: May 2008; Offline

Oct. 26, 2008 2 a.m.

Hey guys, in the file below, why are my normals spinning around as the sphere transforms?

I want the normals to stay pointing out, and angled a little back from the surface, as in frame 1

i tried a rest position, facet… what else?

Thanks!

Attachments:
normalprob.hip (56.9 KB)


mondi: Member; 44 posts; Joined: July 2005; Offline

Oct. 26, 2008 6:04 a.m.

You are calculating new normals based off changing values.

You must post-transform the object to keep its normals facing the way you specify, see the attached file.

Attachments:
normalprob_621.hip (59.9 KB)


neonshaun: Member; 31 posts; Joined: May 2008; Offline

Oct. 26, 2008 1:57 p.m.

cool, thanks!

but… what if i have deforming geometry that's coming in as say… an fbx or obj sequence. For example, an animated character. I can't put the movements after the copy sop, can i?


Simon: Member; 2199 posts; Joined: July 2005; Offline

Oct. 27, 2008 6:02 a.m.

You may want to look at the Attribute Re-orient sop, and examples in the help.

The trick is finding just the right hammer for every screw


neonshaun: Member; 31 posts; Joined: May 2008; Offline

Oct. 28, 2008 8:02 p.m.

Thanks for that tip simon

problem solved

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