[Sidefx-houdini-list] sdf renders as isosurface

François Duchesneau sidefx at trinix.ca
Tue Apr 2 10:34:33 EDT 2013


Maybe, the version I tried is 12.1.185. In case the plastic shader 
hasn't been upgraded properly, try rolling your own surface shader with 
just a Lighting Model plugged into the color.

Tom Nixon wrote:
> 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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>>>
>>>
>>>       
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