Vray multimatte element antialising

[j_forrester]

Will Vray Multimatte elements ever be able to output clean antialised RGB mattes?

It is such a great tool and saves having to create mutliple model files with self illuminated RGB colours.

 

What is a bit more hard to understand, is that there is a 'enable filtering' check box avaliable?

 

The only way we have managed to get the mattes a bit cleaner is to put the image sampler to 'Fixed' with 5 sub divisions, but this is harder a great option and means having to use two different image sampler types (one for the 'the beauty pass' and one for masks). Because of this you are always going to get slight fringing. Again I could render these double the size and then scale them down in photoshop giving a cleaner edge but this is not an option as most render are between 5-8k wide.

 

Is there any future thoughts with this issue? I know having speaking to many other 3d artists that hey feel exactly the same. Having clean mattes is a must in what we do and being able to speed up this part of our work flow is just as important.

 

Would love to know if this could be adapted to render antialised mattes. Even a black and white clean matte would be useful.

[MegaPixel]

I'm pretty sure the quality of the elements is dictated by the sampling resolution of the render itself. I use multimattes all of the time and get pretty decent results with, say 4/8 DMC sampling. If you stick with the default 1/4 or less, you'll most likely see "stair stepping" edges.

[jab]

Ive had this same question as well. MEGAPIXEL are you sure about the sampling? I use 3/6 DMC and still get the results J_FORR is describing. I usually just fix it in post.

[MegaPixel]

How are you using the MultiMattes? Are you doing a "Select by Color" in Photoshop to make your adjustments? It could have something to do with the Photoshop selection tolerance also. At any rate, I tend to work in resolution ranges of 4000+ pixels so even with average sampling, the multimattes tend to be clean enough for what I use them for. IMHO, Multimatte is not a great solution for precision post production.