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Andrew Fite avatar image
Andrew Fite asked ·

Volume Mesh Image Based Displacement - C4DtoA

I am currently experimenting with the Volume Mesh rendering for a project and have run into an issue when I try to use an image based texture for displacement. In fact, I can't get anything image based to affect the volume. When using Arnold's built in Noise shader it works just fine and as expected. I just can't figure out why I am seeing no effect when feeding in image based textures.

Does anyone have simple example or node tree that can successfully show image based displacement of a Volume Mesh?

texturedisplacementvolumetrics
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Peter Horvath avatar image
Peter Horvath answered ·

Right, camera_projection works because it eliminates the need of the UV field:

> Separately, do you know if there are any plans to support image based displacement with a Volume mesh? It just seems like that would be a very powerful feature.

I don't think it will be supported in the near future.


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Lee Griggs avatar image
Lee Griggs answered ·

Those are Maya examples. A simple scene for C4DtoA can be downloaded here and here.

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Any chance for the same approach in C4D? Or it works only in Maya cuz it has a 3d texture feature?

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Andrew Fite avatar image
Andrew Fite answered ·

Thanks Peter for the explanation.

I guess I was just thrown off by the documentation

https://support.solidangle.com/display/A5AFMUG/Polymesh+to+Volume

There is an example where a file texture is projected onto the volume mesh. It mentions that it used a camera projection to accomplish it. So I am not exactly sure what kind of texture file it is referring to or how the camera projection enabled the volume texturing. The details are very vague.

Also, do you know what is being referenced in this example of images where is says file texture?

https://support.solidangle.com/display/A5AFCUG/Mesh+Volume

Finally, do you know if there are any plans to support image based displacement with a Volume mesh? It just seems like that would be a very powerful feature.


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Peter Horvath avatar image
Peter Horvath answered ·

Image based displacement of a Volume Mesh is not supported. You would need voxel based UVs which are not available in a mesh. Using a VDB which contains a UV field should work.

The noise shader works because it operates in object space.

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