Ripple effect in Smoke

[Mokiki]

Currently I'm messing around with phoenix to get a better understanding, yesterday while playing with the smoke settings I notice small ripples (Hope I'm using the right word for it) in my render.

Does this effect happen because of wrong render setting or sim settings?

Using ir/lc as render method.

[Ivaylo Katev]

seems like light cache artifact. make single rendering without light cache for test

[Mokiki]

because I'm an idiot I accidentally overwrote the file so I have a slightly different light setup but the artifacts are still visible without light cache.

[Paul Oblomov]

Lightcache in phx rendering rollout.

[Ivaylo Katev]

hm, does not seem to be the light cache, well can i see the scene?
send it to phoenix@chaosgroup.com

[Mokiki]

Turned off LC inside the phoenix render rollout

ripples still there. Only difference much longer render time.


@Ivaylo

I send you the file.

[Ivaylo Katev]

yes, i expected that after you second shot, because the LC artifacts appear only in very dense smokes, but the smoke above is not dense.
i have one question - is this the cell size? because the rest smoke looks detailed, or it's just displacement?

[Mokiki]

If I understand your question correctly than yes I think it's mostly displacement.

[Ivaylo Katev]

well, this is a bug in the displacement algo (affects only the new volumetric displacement that was introduced the last release)
i made two shots of frame 13 to show the difference.

[Mokiki]

Is there an chance the bug will be fixed in one of the next releases of phoenix? And thanks again for your responses.

[Ivaylo Katev]

yes, it's fixed already, the second image shows the render result after the bug was removed.

[Mokiki]

Ah thanks for the clarification.