What exactly does the "Secondary matte environment" do?

[Crayox13]

I was not doing it correctly then. Thanks, will try that and with multimatte. I mean I was using vraymtl which gives many different colours (not only rgb) so I didn't know how to select those.
And yes, filtering was also on, will try to turn that off.

[AC5L4T3R]

I was not doing it correctly then. Thanks, will try that and with multimatte. I mean I was using vraymtl which gives many different colours (not only rgb) so I didn't know how to select those.
And yes, filtering was also on, will try to turn that off.

It's best to keep filtering on then you get a smooth edge. If it's unfiltered then you get a horrible jaggy mess. This MaxScript http://www.scriptspot.com/3ds-max/sc...automultimatte does a great job of automatically assigning MultiMattes if you have a lot of objects and materials. Although my only gripe with it is that it chooses to name the MM with the material names. In our workflow we just use 101,102,103 etc.. so if there's anyone out that could modify the script to put that for me instead of the material name, I'd be eternally greatful.

[Crayox13]

Now I have two multimatte elements since I need 4 separate layers but only the second multimatte is saved. In open exr channel I added both. This layer thing is really tricky for me lol...always problems. Initially I was doing it wrong because default save is RGBA and with that I get only get empty files like alpha is zero and eats the data

[thanulee]

I'm not sure if I understand you correctly. In any case: The way you use those RGB-Masks, the ones I talked about, is you place your mask on top of your document in PS, so you basically only see that one, nothing else. Then you go into channels and ctrl-click the R G or B channel and there you get your pixel-perfect mask. If you do very drastic changes you might have to expand the masks a tiny bit, but it's all managable in my experience.

Edit: In tools other than Photoshop you can use the R G or B channel as mask in your operator. Maybe you have to do a shuffle before, depends on your program/settings I think.

I ll check this out, cause Multimatte sometimes has jagged edges while my render is perfect. And i am forced to do a new render for my matte only in black/white and that messes up my files. So ur saying even if i have jagged edges on multimatte, i must use only its R channe in aftereffects. Its easy to compose stuff when they have no others intersecting, but when they do is a whole other story and u cannot expand ur masks most of the times.

[thanulee]

And since this thread is up, VrayWrapper material is obsolete? Why should i use this for matte instead of my right click menu? ty