Multi-channel exr

[bart]

Hi all,

I heard that there may be somewhat of a standard or agreement of what layers were recently being used for multi-channel exr files.

I'm considering making an output shader example of how to do this, in addition, to making it easier to do within the 3D applications in the future.

Without an output shader, mental ray currently supports putting the primary framebuffer and z into an exr file, eg, in the camera block

output "+rgba_h, z" "exr" "file.exr"

In an output shader, you could also add arbitrary channels, including user framebuffers. And I believe ctrl.studio has an example of this as well. Max?

[Puppet]

You may view example of such shaders in shaders_p pack here: http://www.puppet.cgtalk.ru/download/shaders_p_e.shtml
source code also available.

For example in my shader it looks like:

Code: Select all

output "+z,+n,+rgba_h" "p_OpenEXR_saver" ("fileName" "d:/test3/untitled.1.exr", "compression" 1, "rgbaPass" on, "rgbaFormat" 1, "zPass" on, "zFormat" 1, "nPass" on, "nFormat" 1, "mPass" off, "mFormat" 1, "tPass" off, "tFormat" 0, "cPass" off, "cFormat" 1, "shadingPass" on, "shadingBuffer" 20, "shadingFormat" 1, "colorPass" on, "colorBuffer" 21, "colorFormat" 1, "diffusePass" on, "diffuseBuffer" 22, "diffuseFormat" 1, "diffuseShadowPass" on, "diffuseShadowBuffer" 23, "diffuseShadowFormat" 1, "specularPass" on, "specularBuffer" 24, "specularFormat" 1, "specularShadowPass" on, "specularShadowBuffer" 25, "specularShadowFormat" 1, "diffuseOcclusionPass" off, "diffuseOcclusionBuffer" 26, "diffuseOcclusionFormat" 1, "indirectIllumPass" off, "indirectIllumBuffer" 27, "indirectIllumFormat" 1, "ambientPass" off, "ambientBuffer" 28, "ambientFormat" 1, "ambOcclusionPass" off, "ambOcclusionBuffer" 29, "ambOcclusionFormat" 1, "reflectPass" off, "reflectBuffer" 30, "reflectFormat" 1, "refractPass" off, "refractBuffer" 31, "refractFormat" 1, "incandescencePass" off, "incandescenceBuffer" 32, "incandescenceFormat" 1, "depthPass" off, "depthBuffer" 33, "depthFormat" 1, "bentNormalPass" off, "bentNormalBuffer" 34, "bentNormalFormat" 1, "specialC1Pass" off, "specialC1Buffer" 35, "specialC1Format" 1, "specialC2Pass" off, "specialC2Buffer" 36, "specialC2Format" 1, "specialC3Pass" off, "specialC3Buffer" 37, "specialC3Format" 1, "specialC4Pass" off, "specialC4Buffer" 38, "specialC4Format" 1 )

Or you need something different?

[bill spradlin]

Something along the lines of PRmans AOV's would be nice to see standard in mental ray. Ctrl_buffers outputs the passes to separate .exr files, which isn't very useful for a lot of people, especially if your compositing package supports multi-channel .exr's.

[bart]

To ask my question more clearly ...

Is there a standard list of channel names for an all-in-one multi-channel exr?

In other words, I heard there was a convention for these names going around in LA? Anyone got them?

[Puppet]

bart, OpenEXR format have only 4 predefined name for channels: R, G, B and A.
And I didn't heard about any conventions.

[bill spradlin]

Guess I totally mis-red that heh, sorry Pirates has left me a little scrambled....

I'll see what I can find out for you Bart, cheers.