Brad,
Actually this is beginning to make a whole lot of sense to me. I've been
fighting with this for months. You are correct, it doesnt behave as you
expect without turning off wrap. But I think think the wrap feature here
is misleading. I think all wrap is suggesting is a repitition of the
captured texture within the extents of the texture support, not
necessarily virtual wrap, but local wrap. In other words with clamp on
you limit the bump application to only the area within the spatial
texture support. You could have scaled up the spatial support so that it
is larger than the sphere and you would have seen the texture on the
sphere. Turning clamp off allows the bump to be processed as a virtual
pattern. But wrap changes this behavior. With clamp off and wrap off the
pattern behaves just like Soft3D's 3D textures. The pattern continues
forever in virtual space. But with clamp off and wrap on, the pattern is
restricted to only the texture inside the spatial support, and that
local pattern then gets repeated in virtual space indefinetly and is
affected by Alternate, Repeats, Offset etc. The only issue here appears
to be that turning off clamp seems to somehow adversely affect the
intensity of the bump so you have to raise the bump factor higher than
normal. If you are wanting to avoid all this you can start by scaling
the spatial support to enclose the object you want textured, and then
reset the UV Remap maximums to the same values as you scaled the
support, and then fine tune it from there.
Joey Ponthieux
NCI Information Systems Inc.
NASA Langley Research Center
____________________________________________________________
Opinions stated here-in are strictly those of the author and
do not represent the opinions of NASA or any other party.
brad wrote:
>
> This isn't working unless Wrap is turned on, which often defeats the purpose of procedurals. :-(
>
> > -------Original Message-------
> > brad wrote:
> > > Here are the steps that illustrate the problem:
> > >
> > > 1- Assign a lambert to a primitive nurbs sphere
> > > 2- Connect the bumpmap generator to the bumpmap material input
> > > 3- In the bumpmap generator, create a planar XY texture projection
> > > 4- Connect the procedural fractal texture to the bumpmap generator input
> > > 5- Connect the Texture Space Edit node to the fractal coordinate input, set the UV remap max to 10,10,10
> > > 6- Connect the Vector state node to the texture edit input, set the state to Texture Vector
> > > 7- Render region the sphere.
> > > 8- :-)
> > >
> > > 9- Go to the bumpmap generator and create a spatial texture projection
> > >
> > 10- Uncheck the Clamp option in tthe bumpmap generator.
> > 11- Go back to the Texture Edit, set the UV Remap to 1, 1, 1
> > 12- Render region the sphere
> > 13- :-)
> >
> > ---
> > Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
> > unsubscribe xsi
> >
>
> ---
> Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
> unsubscribe xsi
--
---
Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
unsubscribe xsi
