Removing grid-like artifacts?

[dgould]

How do I remove the artifacts at the bottom of the smoke in this image? I have tried to reduce the Step (%) parameter to 5% but still getting artifacts. The scene has a single spotlight on the left and it is using ray tracing. I understand that light caching can cause this kind of artifact, but I don't believe I have light caching turned on. I'm using default render settings.

Thanks.

[Paul Oblomov]

Resim ?

[Ivaylo Katev]

seems like light cache is to blame, try to render without light cache and tell us if the problem persist

[dgould]

Is Light Cache on by default? Sorry, but where do I turn it off?

[dgould]

Ignore my last post. I found it.

[stevesideas]

I thought I'd add to this post rather than starting a new one.

I'm getting the same issues on the FD 2.2. I've tried lowering the step% but it doesn't help, it just slows down the render. Any help on what to do ?

[Ivaylo Katev]

cant say without image or scene, for example too strong alpha can cause this, but light cache problems also can cause grid artifacts

[stevesideas]

I'll send the scene tomorrow. Cheers