Re: bump mapping with procedural textures?

[André Adam <a_adam(at)49games.de>]

Since I have first seen that setup I try to get my head around the 
Texture Vector the Vector State node returns. That one should be 
dependend on the Texture Projection, no? If the object carries multiple 
UV Spaces, how does the Vector State node decide which one to use? Does 
it forward-traverse the Render Tree branch it is connected to until it 
finds a shader having a Texture Space reference (in this case the 
Bumpmap Generator)?


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- Render region the sphere. 
> 11- :-(
>
> 12- Get a projection lookup node and pipe it into the texture edit coordinate input
> 13- Pipe the texture stream into the surface input of the material
> 14- Render region the sphere
> 15- :-/
>
> Bumpmaps work fine for planar, spherical, and cylindrical projections, but not for spatial. Please explain.
>
>
>  
>
> > > -----Original Message-----
> > > From: owner-xsi(at)Softimage.COM
> > > [mailto:owner-xsi(at)Softimage.COM] On Behalf Of brad
> > > Sent: 23-March-2006 21:35
> > > To: XSI(at)Softimage.COM
> > > Subject: RE: bump mapping with procedural textures?
> > >
> > > The issue we've been running into with procedural bumpmaps
> > > has to do with topologies more complex than spheres or tori,
> > > such as landscape with multiple caves and holes (our prior
> > > show!). In such situations we tend to use procedural textures
> > > since they can be easily applied in a seamless fashion via a
> > > 3D spatial coordinate system.
> > >
> > > Unfortunately, while RGB results are fine for where the
> > > surface intersects the spatial texture coordinates, it
> > > doesn't work for bump map vector space. You need to create a
> > > 2D texture map for bumps to work.
> >
> > I'm not sure I follow you.
> >
> >
> >
> >
> > >
> > > Thus the question, does the Zbump node work for procedural
> > > textures using spatial coordinates?
> > >
> >
> > I've been getting very good results.
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