UVRandomizer + Normal Map behavior

[DestinHalfmann]

Hi Guys,

Is it expected behavior when using the UVrandomizer with Normal maps, that you have to Flip the Red Channel?
If I don't use the UVR, I have to flip the Green Channel as expected.
Also, is this the correct setup when using normal maps with triplaner and UVrandomizer?

[hermit.crab]

Huh, you're right. It seems the VRayUVWRandomizer flips a channel for some reason. I'll do some tests and write back.

[vlado]

There should be no need to flip the R channel, but the picture also shows a very strange setup. If you look at the Cosmos materials you will see that the Triplanar map is generally connected as the mapping source of the VRayBitmap used as a normal map. For some reason you have connected the VRayBitmap as the texture of the VRayTriplanar map - which is probably what causes the issue.

I've attached the correct setup, which you can check in the Cosmos materials.

Best regards,
Vlado

[DestinHalfmann]

Yeah that was my initial setup, but the Documentation Triplaner Notes says otherwise:

[DestinHalfmann]

There should be no need to flip the R channel, but the picture also shows a very strange setup. If you look at the Cosmos materials you will see that the Triplanar map is generally connected as the mapping source of the VRayBitmap used as a normal map. For some reason you have connected the VRayBitmap as the texture of the VRayTriplanar map - which is probably what causes the issue.

I've attached the correct setup, which you can check in the Cosmos materials.

Best regards,
Vlado

So I just double checked.
If I use the setup you provided, I still get the same behavior.
As long as UVRandomizer is part of the map tree, the red channel is being flipped in the VRayNormalMap.

[vlado]

Did you turn on any of the checkboxes in the VRayUVWRandomizer? If they are all disabled, then it's not supposed to do anything but it does seem like it flips one of the channels (which we will fix). However as soon as I turn on any of the checkboxes, things are ok.

Best regards,
Vlado

[DestinHalfmann]

Did you turn on any of the checkboxes in the VRayUVWRandomizer? If they are all disabled, then it's not supposed to do anything but it does seem like it flips one of the channels (which we will fix). However as soon as I turn on any of the checkboxes, things are ok.

Best regards,
Vlado

I did not enable any checkboxes no.
But simple workaround, thank you.
Hope to see the fix in next hotfix/update.