bump mapping difference production and rt

[7enith]

Hello,

I noticed a major difference in bump mapping in production and rt. The lower and correct image is from rt -see link-
The object is a vray proxy and the material is a alsurface. All Bump settings from every layer inside the shader are set to 3mm. Its from the most recent nightly, I didn?t check it on a previous versions yet. I tried bump shadow and lower bump settings as well with no results

https://www.dropbox.com/s/2ukbacynw0..._0929.JPG?dl=0

all the best
christian v.

[7enith]

Just tried the normal Vray Material, it has the same issue

[vladimir.nedev]

Can you send me the scene ?

Greetings,
Vladimir Nedev

[savage309]

Is that GPU vs CPU render (potentially with bitmap with high-frequency details) ?

Best,
Blago.

[7enith]

Hi Vladimir, Hello Blago,

its CPU and yeah its a cloth bump with high frequency. I did load the problem objects into a separate scene where it strangely didn?t display the difference between production and RT. But for some reason I switched the Anti Aliasing Button on and the bump effect looked better :0) I attached a reduced version of the scene.

https://www.dropbox.com/sh/hn5cl5nrb...d7mcnNoKa?dl=0

Currently I have some stuff to do, but later I?ll touch the big scene and take a look if the AntiAliasing solves the problem. If not I?ll prepare it and send it over to you guys!

Thanks a lot
cv

[savage309]

High-frequency textures used for bump are known to be rendered differently in V-Ray GPU. Keep in mind that V-Ray GPU is a separate engine, and although it shares the same UI and often renders close to V-Ray CPU, our goal is not to make them matching exactly and they will never render 1:1 (but often will render close). Such differences can be expected and are rather normal.
In this case however, if you use a lower resolution version of the textures for the bump mapping, the result should be closer.

Best,
Blago.

[7enith]

oh my bad! With RT I mean not GPU! I mean actually the Interactive Rendering and the final Production Rendering
So all CPU, sorry for the confusion! So maybe I try MipMapping on that one?