alpha merge problem

Jan 30

alpha merge problem

Hi everybody,

I’m pretty new to node compositing, I was trying to composite some fumefx with debris, rendering it separated from smoke.
I thought that using a matte material on debris (that rotates around the fume) was the good way to do it, but when I started merging channels in fusion I had this problem:

and this is the correct alpha from the beauty pass, with debris and fume in the same render:

I hope someone can help me with this problem 🙂

Thank you in advance,

Matteo

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Hasta La Motion!