Big difference between IPR and Production render for complex material

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

Hi,

I wanted to reuse an older material I made back in the day for some rooftiles, I was testing this material in IPR, but to my surprise the production render is completely different. No idea why. FYI the production render is correct.

Edit: I have 2 UVW maps in 2 different channels. If I disable these the IPR and PROD match up.

IPR:

IPR
IPR1500×1500 450 KB

Production:

PROD
PROD1500×1500 340 KB

Material. I know the triplanar isn’t wired correctly for the the normal map, but it’s an old material and I didn’t know it back then.

Screenshot 2026-06-03 150712
Screenshot 2026-06-03 1507121920×994 209 KB

2

Please send the scene so we can troubleshoot it.

3

Hi Aleksandar, I did: Submission ID# DF8L-NU1R

4

Seems to be caused by the MultiTexture nodes. Replace them all (most with VRayColor and a single one with a VRayMultiSubTex), and you’ll get identical results between IPR and Production. I’ve sent you the fixed scene (email).

5

Hi,

Thanks for troubleshooting. Yeah with newer materials I don’t use multitexture nodes anymore to generate different shades of grey to have some light/dark differences between different elements. Thanks I’ll replace them all with VrayMultiSubtex. So is it a bug in multitexture or vray?

6

Not sure. One other thing that seems to fix the issue is converting the Bitmaps to VRayBitmaps OR switching a certain Composite map to a VRayCompTex…

Simplified it to here:

3dsmax_oDCBpXPSyO
3dsmax_oDCBpXPSyO2528×1125 276 KB

The cornerest of all cases. Probably the maths gets mixed up at a certain point in IPR.

7

Good to know thanks Aleksandar.