Displacement doesn't like UDIM

V-Ray V-Ray for 3ds Max Issues
1

So I have a mesh that has a vray displacement modifier on it. The mesh uses UDIM in 2 quadrants, however, the mesh in this particular example has uvs in quadrant 1. If I use the udim tag in my VrayHDRI bitmap loader, like this…

D:\image<UDIM>.exr

I get the blurry results like image 1 below…

If I remove the udim tag and just grab the quadrant 1 image like this…

D:\image1001.exr

I get the sharp results in image 2…

Since all the uvs are in quadrant 1, technically both renders should be loading the identical bitmap to do its displacing, it just seems like when I use the UDIM tags, the bitmap is blurred and when I load the map directly it is not.

Any idea what’s happening? Is Displacement not compatible with UDIM?

- Neil

2.jpg
2.jpg640×480 86.9 KB

1.jpg
1.jpg640×480 85.7 KB

2

So just to update this, chaos group support looked into it and the problem is that when using UDIM, the filtering on the displacement map is always on, even when the “filter texmap” checkbox is unchecked. A workaround is to turn filtering on, then set it to 0. The bug will get fixed in a future release. Just posting in case anyone was curious.

- Neil

3

Hey, just letting you guys know this wasn’t fixed in 3.3. Maybe we could get it looked at for 3.4?

- Neil

4

Yes, will work on it as soon as possible.

Best regards,
Vlado

5

Thanks!

- Neil