Smoke: How to comp?

What's your recommendation to comp smoke?

RGB inlcudes all:


without smoke:


smoke render with matte objects:


@problem:
When ever I use the matte render on top of the render without smoke - the final comp doesn't match the RGB-beauty pass.

Question:
How to setup to comp to match the RGB-beauty render?

It depends what's in the alpha channel of your smoke pass. But it also seems that your smoke is casting a shadow, so that will also need to come from somewhere.

DC

any recommendation you would create the alpha and comp setup?

using vray by the way.

I would usually render a seperate pass with matte objects for smoke elements. Are you using FumeFX?

I am using Phoenix FD and running into the following issue.

Chaosgroup's equation:
VRayRawLighting x VrayDiffuseFilter = VRayLighting

My problem:
VRayRawLighting x VrayDiffuseFilter = DOES NOT MATCH the VrayLighting Pass

VRayLighting:


VRayRawLighting x VrayDiffuseFilter: result below does NOT MATCH the VrayLighting pass

The MERGE node inside Fusion is set to MULTIPLY.
a) Anything else I have to consider?
b) What am I missing here?

It is a bit hard to understand, what exactly are you doing. The two elements in first post clearly are not meant to be multiplied together, so what exactly and where is set to multiply?

The last image looks like result of unpremultiplied rgb handled as premultiplied, which produces bright halo.

To peek into this, upload the elements and reference render, without looking what the rgb and alpha channels contain, it is only guesswork.

sorry. Here is the .zip file.
http://www.mediafire.com/file/1dkoq6wqkdd1aqa/Shot_001.zip

I think I figured out what caused the problem. When loading the .exr I think I have to check:
MAKE ALPHA SOLID