[Sidefx-houdini-list] sdf renders as isosurface

Tom Nixon ignivomous at gmail.com
Tue Apr 2 10:30:03 EDT 2013


Yes, I replaced the surface shader with a plastic shader.

I'm wondering if something has broken in 12.5 or if I need a reboot!

thx


On Tue, Apr 2, 2013 at 2:39 PM, François Duchesneau <sidefx at trinix.ca>wrote:

> 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.
>
> François
>
> 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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