Material ID render element disabled by default?

[b.maio_SGA]

Hi,

I'm currently using the latest vray for rhino 4.20.02

From what I can remember from the previous versions, the Material ID layer was alway 'on' by default. I wonder why you left it disabled now, especially for the materials in the vray library.
This is not a problem usually, but when you use a lot of materials from the library like I do, I find having to remind myself to turn on something that was always 'on' before.

Thanks again

Maio

[Micha]

+1

Maybe a configuration option could allow to enable the material ID for new created/imported materials like it was working in the past.

[konstantin_chaos]

Hi,

There is now a better way to generate random colors based on material assignments - with the Material Random Color element.
The material ID attribute is actually a shading effect that slows down the rendering calculations (a little bit but still).
That's why we implemented this new element in V-Ray Core that does a similar thing without any shader modifications.
It is similar to Cryptomatte but outputs an 8bit image, works in interactive and on GPU.

Hope that helps,
Konstantin

[Micha]

Hi konstantin_chaos

I like that the user can control the colors of the material ID and it's so easy to use (my client like to get a single color mask). I miss a way to set the colors for the Material Random Colors, for example I like to set some materials at the same color or I set some materials black. Or if I need to render mask through glass than I set the Mat ID color of the glass to an useful grey value so that the colors behind are good visible.

Sidenote: I miss to generate color mask through glass in GPU mode. Also the Material Random Color doesn't work. Doe's cryptomatte support masks through glass in GPU mode?

[Peter.Chaushev]

Material masks as seen through refractive objects are currently not supported on GPU. The workaround here would be to do a fast CPU render of the same shot by disabling all lights (Render Parameters > Switches > Lights) and use the generated render elements to compliment your GPU render output.

Kind regards,
Peter