[Sidefx-houdini-list] sdf renders as isosurface

François Duchesneau sidefx at trinix.ca
Tue Apr 2 09:39:42 EDT 2013

If I open the VolumeNoiseIso example and replace the surface shader 
"vopsurface1" in shopnet1/material1 by any surface shader that has a 
standard illumination loop it's working. It's because the current shader 
they provide is not meant to react to light but rather to show the normals.

You'll have to change also the code inside "vopcvex1" to include a 
"Volume Sample From File" and "Volume Gradiant From File" to read your 
SDF volume.


Tom Nixon wrote:
> Hi all,
> I've been trying in vain to get a surface render out of an sdf in Mantra.
> The VolumeNoiseIso example is */kind of/* interesting. The problem is that
> the alpha is never black. I also was unable to get the surface to respond
> to light in any useful way.
> Eventually I want to do this with VDB, but I've not even been able to get
> this up and running with a simple sphere and houdini volume sdf.
> Can anyone give me a push?
> Cheers,
> Tom
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