Xpresso Bug causes missing textures

[Doger]

We are in the process of getting a little organized and so wanted to create material previews of our materials. Unfortunately there seems to be a priority bug with Xpresso. I wrote a simple Xpresso script to change the material on my shaderball per frame. The change works, but the bitmaps are not loaded when changing the image.

Here is a simple scene that shows the problem:
Mat_ERROR.zip

If you render frame 1-2 then the image is not loaded. If you render only frame 2 then it works as intended.

Does anyone know a workaround or am I making a mistake here?

[aleksandar.kasabov]

Hello Doger,

Thank you for reporting this to us.

It seems to be a bug that affects CPU rendering. The current workaround would be to render your scene with V-Ray GPU. If you need to render it on CPU, you could render it with V-Ray GPU in CPU mode.

I have reported this to our developers for fixing (bug ID: VC4D-1320) and I will let you know once we have any updates. Thanks!

[Doger]

aleksandar.kasabov Thank your for the workaround. Unfortunatly the rendering freezes after 3 Frames and i have to restart C4D. Can you check on your side if this happens as well?

[aleksandar.kasabov]

Hello Doger,

I regret to hear that.

Upon testing this on my end I didn't experience any issues when rendering with V-Ray GPU. Which GPU mode are you rendering in? Please specify your GPU model, GPU driver, V-Ray and C4D versions, and your OS. Can you also check the V-Ray log in the console to see if you get any warnings or error messages? Thank you.

[Doger]

Hello aleksandar.kasabov

I was able to narrow down the error. I had converted TIF files to EXRs with the img2tiledexr tool. With the EXRs it comes to the freeze. If I use TIFs again for the textures everything works as desired.

Is there anything I need to consider when using tiledEXRs? The textures are loaded without MipMaping. They are the metal textures from 3D RnB and they are created without interpolation.

I render in GPU RTX mode.
3090
Windows 10
recommended Drivers 497.09
latest C4D version 25.117
Nightly VRay Build from 2022/04/12

[aleksandar.kasabov]

Hello Doger,

I tried using a converted (from TIF) EXR file but I didn't face any issues with it. Would you mind sharing either the exr file or the whole scene so I can check it? Thank you.