Decal

V-Ray for Rhino V-Ray for Rhino :: Issues
1

I have a couple of questions about decals.
1. Do decal is working with RTX GPU rendering? I’m getting a black result if I use a material with a texture and the decal is not visible if I use a mask. CPU is working good

13.jpg
13.jpg1914×1037 457 KB

2. How do I rotate-mirror the decal? In my test (CPU) the logo seems to be mirror and I have no idea how to fix it. The correct result should be as in the texture preview.

12.jpg
12.jpg1920×1040 469 KB

2

I found that if I mirror the decal dummy object I could mirror the decal.

3

Do you guys know the answer to the first question in my post about Decals and GPU RTX rendering?

4

Hi @javierrentas ,

The described scenario works as expected for me:

decalRTX01.JPG
decalRTX01.JPG1915×918 101 KB

Can you share an example scene that shows the problem?

Konstantin

5

Hi Kotse,
I did another test and I’m getting the same result as before
Decal CPU

DecalCPU.jpg
DecalCPU.jpg1280×720 247 KB

Decal GPU RTX

DecalGPU.jpg
DecalGPU.jpg1280×720 179 KB

Here is the scene:
https://drive.google.com/file/d/1zsJgiiGNQrFhFWYx4YuF-CSJE6XYcm5O/view?usp=sharing

6

Thanks for the scene!
I was able to reproduce the issue as described and found what’s causing it.
Once again the On-demand Mipmapping option is the reason.
Using full size textures fixes it:

onDemandDecalIssue.jpg
onDemandDecalIssue.jpg2128×1313 524 KB

I’ll log a bug for this.
And excuse us for the inconvenience.

Konstantin

7

Another solution for this I found is just applying the Decal material to another scene object (not a decal).
It seems that V-Ray GPU is not generating mipmaps for materials applied only to Decals…

8

Hi Kotse,
Thank you for the solution. I’m glad you guys found a workaround. Thank you!