MultiMatte on Xref

[shauncarollo]

I'm having trouble with getting Vray to save my MME on an Xref'd scene. When I enable the MME in the Xref'd file, it gives me the default 'won't show enabled but will render fine,' but I get no saved file from rendering within that scene, or my master file that has this scene Xref'd into it. Is this possible or do I need to merge the objects into the master scene to get my masks?

[Francisco Penaloza]

MME?? what's is that?

[shauncarollo]

MME= MultiMatteElement in Render Elements.

[Francisco Penaloza]

You should put Materials ID to the materials that you want to use Multimats in your Xref scenes, try to use different numbers so each materials has a unique number, this material ID should carry to the master scene, then in your Master Scene you create your Multimats outputs, in the render window. Everything should render fine, just remember that by default VRay always write the same name in the file "MultiMatteElement" so you have to change this name if you have more than one multimatt pass, call it MultiMatteElement_1, MultiMatteElement_2 and so on, or B,C,D or whatever you fancy.

For example, in my libraries I have all my cars using Mats ID from 0 to 10, then everything else goes above those numbers.

 

fco.

[shauncarollo]

I can't even get it to save out a single frame's mask, or Zdepth element for that matter. Does anybody have a workaround for when that dialog box pops up saying that the element will not show enabled, due to Vray not allocating extra memory for it, but it will render fine? In the past I had just disabled the VFB when doing the final render and that worked.

[Francisco Penaloza]

How much RAM do you have? and how big are you rendering?

Very strange though VRAy is very scalable, I usually output as EXR, multilayer, SO I use the save as VRay Raw image, but I select use EXR 32 Bits.

You can try that or just save as VRay raw and extract the passes with the Utility that come with VRay.