Sometime I use Z pass or Normal pass ( i.e. for removing noise with Bilateral blur)
Now I’m playing with smoke but I notice that the smoke domain is in my Z Pass and Normal Pass.
This is completely unuseful!
Yes of course.
And I’m glad you asked because I had forgotten to multiply my normal and depth value by the density of the smoke.
The disadvantage of this method is that you need to render the smoke separately than your other objects. Which is a good thing anyway to work with more than one layer.
I did it with Cycles but I’m sure that’s also possible on BI.
You can download the file here.
I got it! It works!
All the process is a nice ride!! Because now I should “mix” the normal of the smoke with the normal of the rest,( and Z too) in order to apply a bilateral blur filter (like in this tutorial for reducing noise http://youtu.be/h2UnvgqXqLc)
Many thanks!