Hi all,

We are currently trying out Karma in solaris and are running into a bit of trouble with displacement and motionblur. The displacement works great but whenever we activate motioblur it seems the displacement disapears or at least gets really diffused out. Even on parts where the object is not actually moving/deforming. We are using default motionblur ie no velocity blur. We have tried to boost the dicing both in render settings and on the geometry itself but to no effect. Not sure if we are missing another setting we have to tweak to get the dicing working once motionblured.

We cant really show any images sadly as its a live project but if anyone has run into this earlier or has any ideas we would be really greatful.

I guess its stated in the logs after reading up a bit.

20.5.382
Due to bug fix in shading normals, displaced mesh with deformation motion blur may shade differently.

20.5.382
Fixed a bug where shading normals erroneously used pre-displace normals for motion segments when a mesh has displacement shader and rendered with deformation blur. This bug was introduced in 20.5.305.

Displacement seems fixed in 20.5.410 but it seems shading is still broken when rendering with motionblur and displacement.

Hi, can you please file a bug with an example file? Thank you.

Hi, I'm also experiencing the same problem in H20.5.522. Do you have any solutions for it?

I would recommend using the latest daily or production build - 522 is a bit outdated and there were a couple displacement shading related bug fixes since then.

dlee
I would recommend using the latest daily or production build - 522 is a bit outdated and there were a couple displacement shading related bug fixes since then.

Thanks for the reply! I updated to H20.5.684 and the problem is gone.