Glossy with Object Motion Blur bug

[kintuX]

If Camera Motion Blur is active (on) then Glossy reflection gets corrupt, is stuck to surface & shading goes flat...
(BlendLuxCore alpha4, w7)

eg
1. Motion Blur ON

2. Motion Blur OFF

EDIT/ scene file attached

Atollo238_bug.zip

(842.96 KiB) Downloaded 382 times

[Dade]

This is likely to happen because some error in UV transformations, going to check.

[B.Y.O.B.]

In your .blend file, only object motion blur is enabled, not camera motion blur.
Just saying because you wrote "Camera Motion Blur" in your post.

[kintuX]

In your .blend file, only object motion blur is enabled, not camera motion blur.
Just saying because you wrote "Camera Motion Blur" in your post.

oh, my bad, fixed the title thanks

[kintuX]

narrowed down to Object (bug only appears when Object is checked/enabled)

ps
used an updated BlendLuxCore from current master

edit: above mentioned build crashes instantly when rendering with OCL (noticed it first when i tested the updated pyluxcore.pyd)

[Dade]

It should be an OpenCL-only bug. This is a rendering with PATHCPU:

and this with PATHOCL:

Going to track it.

[kintuX]

It should be an OpenCL-only bug. This is a rendering with PATHCPU:
...
Going to track it.

So am back to official alpha4
& IDK... i get even worse result switching to CPU
ie. first frame renders OK (as yours), but on the next frame partial geometry simply disappears (also in LuxCore display)
eg.

[Dade]

There were 3 problems. One was general when rendering any anisotropic material (metal, glossy, etc. with uroughness != vroughness) on GPUs. The second was about motion blur support on CPUs. I fixed both:

The last one: https://github.com/LuxCoreRender/LuxCor ... ry.cpp#L77

I guess it is time to write the motion blur support there

[kintuX]

At least something good out of it all comes... Small victories!
TYVM

[Dade]

I should have fixed everything, this is the original animation posted:

and this with a bit less "purple-ness":