[Sidefx-houdini-list] calculating du dv in sops

Andrew D Lyons tstexture at gmail.com
Wed Nov 21 12:58:24 EST 2007


Thanks!


On 21/11/2007, Andy Walker <andy.walker at framestore-cfc.com> wrote:
> There's a primduv expression, does that do what you want? e.g:
>
> -primduv("../texture1",$PR,"P",0,$MAPU+ch("du_off"),$MAPV,1,0)
>
> Cheers,
>
> Andy
>
> Rangi Sutton wrote:
> > Andrew D Lyons wrote:
> >
> >> Hi,
> >>
> >> Has anyone got a trick for calculating du dv at sop level?
> >>
> >> We have a surface with good uv's and we want to derive point vectors
> >> that orient along u and v.
> >>
> >>
> > Hey Andrew,
> >
> > I've setup a system where we baked out P to maps, then used cops to
> > calculate the surface derivatives. Should also work with uvs. There's a
> > derivative vop that wraps up easily into a cop node.
> >
> > Someone might have a better idea that doesn't involve baking though...
> > I'd be keen to hear it!
> >
> > Cheers,
> > r.
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> >
>
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-- 
=======================================
Andrew D Lyons | Digital Artist | http://www.tstex.com
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