[Sidefx-houdini-list] HDK : Pos using UV Attribute

Olex P hoknamahn at gmail.com
Wed Mar 19 15:02:42 EDT 2008


Yes, as Andrew said you have to transform "phisycally" your model into
uv-space and then do what you want.

On Tue, Mar 18, 2008 at 4:22 PM, brian goodwin <brian.r.goodwin at gmail.com>
wrote:

> Hey man
> my advice seems futile
> ill ask some guy at work when i see him,
> Im sure its possible.
> ssory about that
>
> On Tue, Mar 18, 2008 at 3:24 PM, Jaideep Khadilkar <iamjaideep80 at yahoo.com
> >
> wrote:
>
> > Hi Brian...
> >
> > I already tried using Primitive attribute. But it does the same thing as
> > primuv expression. It uses prim_attribute function of Vex and the help
> of
> > this function says,
> >
> > Evaluates the attribute string att for primitive pn at the parametric
> > location u, v.
> >
> > And I don't want to find the Position on Parametric u and v, but texture
> u
> > and v.
> >
> > I hope u can help me.
> >
> > ----iamjaideep80
> > (Jaideep Khadilkar)
> >
> > brian goodwin <brian.r.goodwin at gmail.com> wrote: I think by using the
> > primitive attribute in VOP's, it should give u the
> > solution.
> >
> > let me know if u need some help setting it up.
> >
> >
> > On Tue, Mar 18, 2008 at 2:59 PM, Jaideep Khadilkar
> > wrote:
> >
> > >  Hi All...
> > >
> > >  I want to find position of a point on a surface using its uv
> > attributes.
> > > "primuv" expression gives me the position, if the surface is NURBS,
> but
> > it
> > > uses orignal NURB uv to calculate position and doesn't use texture uv
> > > atrribute that we modify.
> > > I have a polygon model with UV texture attribute from 0 to 1. Using
> the
> > uv
> > > texture attribute, I want to add some points evenly spaced in the uv
> > texture
> > > space(like a grid) and on the corresponding positions on the model.
> > >
> > > How to do that???
> > >
> > >
> > > ----iamjaideep80
> > > (Jaideep Khadilkar)
> > >
> > >
> > > ---------------------------------
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> >
> >
> >
> > --
> > brian
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