Motion blur causes bump errors

[jonas_schneider]

Hello,

I have a cloth sim setup. The cloth has a specific texture, which I have uv mapped on with a 2Sided Material. The base material is a Standard Material. WIthout motion blur enabled the bump works as expected. But when I turn on the motion blur, it streches the texture in a weird way. My bump map is inside a VRAYBitmap to make it smaller by using the Mapping/Crop. I use VRAY GPU with CUDA.

Someone has experienced a simular issue and knows a fix? I know that VRAY GPU handles Bump in a weird way sometimes.

[viktor_angelov]

Hello,

We would like to say that the outcome is expected.

As the geometry is moving, the Motion Blur is supposed to distort the mesh and all its textures including the Bump Map.
In the Velocity RE you can see in which part the effect is the strongest, therefore the distortion is the most visible.
In the Specular RE you can see clearer the Bump and compare the areas where the distortion is the strongest.

An example of the the Velocity and Specular RE you can see here.

Regards,

[viktor_angelov]

Hello Jonas,

Could you please send us the scene so we can test it on our environment?

If you would feel better, you could open a ticket trough our support contact form and send the scene there. Please include a link to this thread in your e-mail so we can track your issue.

Regards,

[jonas_schneider]

Hello Jonas,

Could you please send us the scene so we can test it on our environment?

If you would feel better, you could open a ticket trough our support contact form and send the scene there. Please include a link to this thread in your e-mail so we can track your issue.

Regards,

Thanks for the reply, I opened a ticket

[viktor_angelov]

Hello,

We would like to say that the outcome is expected.

As the geometry is moving, the Motion Blur is supposed to distort the mesh and all its textures including the Bump Map.
In the Velocity RE you can see in which part the effect is the strongest, therefore the distortion is the most visible.
In the Specular RE you can see clearer the Bump and compare the areas where the distortion is the strongest.

An example of the the Velocity and Specular RE you can see here.

Regards,