Deep Image Compositing Question

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Hi,

I am dealing with Deep Camera Maps for volumes for the first time. I have a question about what is possible within the Houdini compositor, using them.

I know using the DSM Merge render node I can combine deep maps. But, can I alter the images at all in the Compositor before merging? Basically, if I want to change color or alter opacity or do some kind of effect on my volume… Am I limited within Houdini of basically just merging what has already been rendered without any kinds of alterations? I tried to alter my .rat file and render it out again through the Compositor, but the render just errors out and leaves a 1kb file.

Also, it looks like the upcoming version of Nuke will support Deep Image compositing. Are there any tools currently available that supports compositing in this format?

Currently, how are people rendering and combining multiple volumes and doing holdout mattes for solid objects? Any info or guidance would be appreciated. Thanks!
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