Mental ray deep compositing images

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Old 08 August 2011   #1
Mental ray deep compositing images

I am looking for info on creating images in mental ray to be used in nuke for deep compositing.

It sounds like to future of compositing.

Seems like render man and houdini are the only renders out there generating images for nuke deep compositing.

Wondering in there's more info out there for mental ray users.

Old 08 August 2011   #2
Nuke currently only supports deep image files created with prman(dtex files). In the future though, once OpenExr 2.0 comes out, that will be the more standard deep file format which it will support. It will then be up to the renderers to implement writing deep image files into an Exr container.
Old 08 August 2011   #3
I see.

I heard exr 2 is coming out soon.

more waiting . . .

thanks mate
Old 08 August 2011   #4
Even after Exr 2.0 comes out your going to have to wait for Mental Ray to have deep support in the renderer because not all renderers support it by default.

Last I knew only prman, 3delight and Vray support it. There may be others though that I am missing.
Old 08 August 2011   #5
Don't forget Mantra Deke, my personal favourite
Old 08 August 2011   #6
right, forgot about vMantra.
Old 09 September 2011   #7
In the meantime...

The basis for "deep compositing" is having methods for isolating voxel depths from camera independent of the depth image. In that way, you can affect a blur on something that is behind something else.

But since the image format is not available in Mental Ray for this yet, some of the compositing you might wish to do using depth renders might get you partway there.

Simply isolate depth edges of objects much like you would a dof in Nuke, and you should be able to composite without using object's matte (alpha) channels.

I will give this a try in a simple example and post.
Old 09 September 2011   #8
The current Nuke deep tools don't have support for dof yet.

The initial deep support is for doing holdouts and depth compositing which is quite shoddy with zdepth files. This is a huge deal with motion blur and semi transparent objects can be perfectly composited together where using a zdepth for this is completely.
Old 09 September 2011   #9
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