Hello all,
I created a object I apply a volume shader on it and I want to use my alpha texture to guide the density of the volume density(from 0 (no density) to 1 (full density). I am using renderman and houdini, I tried the to plug and to play with attributes but I have no idea how to proceed. thank you
density from texture
595 3 0- Foocus
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- Honza Topinka
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- Foocus
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- 11 posts
- Joined: Nov. 2018
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Hi Honza thank you for your reply,
The Volume is the shape of the surface object.
I want to use a texture as a alpha, the same way you plug a texture into the opacity of your shader.
I am using renderman, the volume shader doesnt reconise the uvs of the object. I tried to use the projection but I didnt manage to make it work.
is ther a way to sore the Cd with a attribut from map > call it inthe shader system through a primvar and use it to drive the density ?
thanks
The Volume is the shape of the surface object.
I want to use a texture as a alpha, the same way you plug a texture into the opacity of your shader.
I am using renderman, the volume shader doesnt reconise the uvs of the object. I tried to use the projection but I didnt manage to make it work.
is ther a way to sore the Cd with a attribut from map > call it inthe shader system through a primvar and use it to drive the density ?
thanks
- Honza Topinka
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- 12 posts
- Joined: May 2015
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Aah, I see. I actually misunderstood, sorry. I guess building to volume from geometry with the texture as an attribute driving the density is not what you want...
Also I don't know or have Renderman, but in Karma I could kind of plugin a texture into a shader with point cloud lookups. Once again probably not exactly what you want, but maybe closer? There has to be something similar in Renderman.
A terrible answer, I know
File attached
Also I don't know or have Renderman, but in Karma I could kind of plugin a texture into a shader with point cloud lookups. Once again probably not exactly what you want, but maybe closer? There has to be something similar in Renderman.
A terrible answer, I know
File attached
Edited by Honza Topinka - May 3, 2024 10:12:33
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