Tweet
I have refractive object with color fog. Affect channels is set to "affect all chanels". I get coloured alpha.
How can I use this kind of alpha? In Natron for example?
How can I use this kind of alpha? In Natron for example?
-
-
You have to use V-Ray's own file output, and keep "save alpha" checkbox enabled. No software out there supports colored alpha channel, because EXR standard doesn't. Therefore alpha with color has to be saved as a separate file/sequence where alpha is written into RGB channel. It's most useful when compositing matte/shadowcatcher objects that have been lit by colored lights (which is almost always the case). -
Thx for answer.
Ok - so when I render alpha to separate file how can I use this file in Natron? This is maybe dumb question but I have animation with coloured glass and i have to output this as png files with transparency.
When I import exr files to natron I lose color on the glass...
I do animation and compositing in Natron rather rarely
___
sorry for my EnglishComment
-
You invert the colored alpha, then multiply it on background, and then add beauty pass on top of that (after removing the monochromatic alpha from it).Comment
-
Thx this works
But - is there any way to render this to transparent png without background?Comment
-
No idea... I would never use PNG when rendering anything I plan to compose in post
Comment
Comment