Can I get same texture-renderquality with GPU? See difference

[steilvorlage.de]

Hi,

I rendered a scene with GPU and CPU. On the left you see GPU - the texture is blurry and flat. The original texture-PNG is 4096x4096 Pixel. Is it possible to get the same nice detailed result with GPU?
In the renderengine "full size textures" is activated.

Cheers
Tobias

[piotrus3333]

Looks rather like too much of denoiser.

[steilvorlage.de]

No, it was switched Off.

[piotrus3333]

So it is down to how GPU handles texture filtering vs CPU.
Is it bump map? normal map? VRayBitmap? are you using VRayColor2Bump? tex filtering type used on CPU?

Just increasing the bump value might be a quick fix.

edit: I've just noticed this is C4D, there might be some other issues at play (I'm on max)

[aleksandar.kasabov]

Hello steilvorlage.de,

As piotrus3333 mentioned above, the issue could be related to the bump map. Currently, there is a known issue where rendering bump maps on CPU and GPU are not identical. Would you mind sharing a simplified scene (with all assets for it) where the issue is observed so we can have a look and confirm if that is causing the differences? Thanks.

[steilvorlage.de]

It is a cmbination with vraynormal and vraybitmap. Attached you find the file

[steilvorlage.de]

I think you are right. I rendered with CPU without bump and it looks very similar to the GPU-rendering. So what can I do to activate the bump with GPU?

[aleksandar.kasabov]

Hello steilvorlage.de,

Please note that the attached scene didn't include any textures so I couldn't test it.

With that being said, please note that there is a known bug where bump maps on the CPU and GPU are not identical. The bug has already been reported to our developers for fixing (bug ID: VC4D-1312) and I will let you know once we have more information on the matter.

As a workaround, you can invert the bump map using the invert option in the V-Ray Bitmap, however, this has to be done for each texture separately.

[Muhammed_Hamed]

Thanks for the report!

Please attach the used textures so that we can verify it is the same bump mapping issue logged in our system

Best,
Muhammed

[steilvorlage.de]

Here you find the textures and the c4d-file in which I deleted unused shaders.

[steilvorlage.de]

Hello steilvorlage.de,

As a workaround, you can invert the bump map using the invert option in the V-Ray Bitmap, however, this has to be done for each texture separately.

Hi, in my case it is a normal map. Inverting the colors result in a yellow-greenish something. The result in the rendering doesn't work. Sorry.

[aleksandar.kasabov]

Hello steilvorlage.de,

Apologies for the delayed reply.

Please note that there are some known differences in the normal maps when comparing V-Ray and V-Ray GPU. We will be working on improving this but I cannot provide any specific timeframe. Thank you.

[steilvorlage.de]

But is there any possibility to use the normalmap with GPU? I wrote you about the problem that your workflow didn't work. In my case the differences in rendertimes are huge.

Thanks
Tobias

[aleksandar.kasabov]

Hello steilvorlage.de,

I understand your frustration. However, this is a bug that needs to be fixed but I cannot provide any specific timeframe for when this will happen. I will let you know as soon as we have any updates on the matter. Your understanding and patience are highly appreciated.

[aleksandar.kasabov]

Hi guys,

As you might have already seen in the Announcements section, we just released V-Ray 6 for Cinema4D, Update 2. With it, we introduced many new features and improvements, along with numerous bug fixes. Please note that the bug with inverted Bump maps with V-Ray GPU, discussed above has now been fixed. You can download the latest builds from here. I hope you will enjoy the new features!