VrayDecal and VrayScannedMtl - Bug Material ID Mask

[legi008]

Hello

Just discovered a bug when using a VrayScannedMtl and VrayDecal.
The MaterialID pass does not take in account the alpha channel of the mask.
When using a VrayMtl in place of the VrayScannedMtl, it works as espected. We get the alpha from the mask

Using Vray 6 Update 2 (6.20.02) and Max 2024

Is this a bug ?
Thanks

[hermit.crab]

I see. I tested the other way around (decal with scanned, host object with VRayMtl). Reproduced and logged (internal bug-tracker id: VMAX-14502). You can use VRayCryptomatte (ID Type: Node material name) as a workaround.

[hermit.crab]

Are you using the Mask feature in the VRayDecal itself? Seems to work as expected on my end. Mind if you attach the scene?

[legi008]

Yes i'm alreadyusing the mask feature.
I've upload the files using this ticket number "Request #291809"

Thanks

[hermit.crab]

I see. I tested the other way around (decal with scanned, host object with VRayMtl). Reproduced and logged (internal bug-tracker id: VMAX-14502). You can use VRayCryptomatte (ID Type: Node material name) as a workaround.