Kalina Borkiewicz

Here is a simplification of my problem:

I have two side-by-side volumes, and one of them has voxels that are twice the size of the other's. Or, another way of wording it – I have two volumes that are the same size, with resolutions e.g. 10x10x10 and 20x20x20.

When I render the image, there is a seam between the two volumes. This seam is not there if the two volumes were have the same voxel size.

How do I remove this seam? Is there something I can do in the shader?

Some more advanced questions that I have, if you're feeling especially helpful:
* How do I render a VDB?
* What is the difference between the “RenderMan (rib)” and “RenderMan RIS (ris)” out nodes?

I would really appreciate help with doing the simplest possible volume render using RenderMan in Houdini. I always just get a black image. I think my issue is that I don't know how to set up a volume shader… A sample .hip file, or just telling me which nodes to use, would be very appreciated.