Exploding particles with solid object

[ijzerman86]

Hello,
For a upcoming project i am working on a simple ship sim. All works wonderful but i have a issue with what i think are exploding particles.
See the image attached or this link to the video https://vimeo.com/267554028
I read in the documentation that the volume needs to be closed so thats what i did. I still keep getting these lines. I managed to fix it enabling meshsmooth but i ideally don't want to use it because it can cause flickering.
I also noticed enabling meshsmooth causing the edges of the simulator being visible as dark lines in the mesh.
Is there something i am missing?
Thanks in advance,
Stefan.

[Svetlin.Nikolov]

Hey, can you try a latest nightly and see if this improves, and if not, it would be very helpful if we can have a look at the scene.

Thanks!

[ijzerman86]

Did a quick render on a still with the latest build and it seems to be gone. Im rendering a sequence now and will keep you posted on the progress.
Thanks!

[ijzerman86]

Did a quick sequence render and its still there but to a lesser extent. I'm redoing the sim right now so maybe end of the day i will know if it worked. If not i will send you a mail via support@chasogroup.com.

[Svetlin.Nikolov]

Roger that, thank you very much! If it's still there, we'll figure it out and update you

Cheers!

[ijzerman86]

Did a quick check yesterday evening, it seems to be in the displacement texture and not the sim itself.
When i turn that of its works ok. Enabling it brings it back. Disabling motion blur shows the deformation spike of the mesh. Changing the detail doesnt fix it.

[Svetlin.Nikolov]

Roger that, got the scene as well. I hope in a few hours I'll be able to update on what's going on and how to fix it.

Cheers!

[ijzerman86]

https://vimeo.com/267761986
New sim and render here on nightly from yesterday. Meshsmooth =1. Problem is still there, seems to be dependent on camera angle, it only occurs on second half of animation.

[ijzerman86]

Disabling embree seems to fix it, at least on a still. rendering a short animation now to test.
:edit:
100 frames sequence seems clear of spikes, rendertimes doubled tho

[Svetlin.Nikolov]

Yes! Finally managed to reproduce it here as well! Let's see what this is and how to fix it. Will ping you when I have more news

Cheers!

[Svetlin.Nikolov]

Hey again,

The rogue polygons are going to be fixed in tomorrow's Phoenix nightlies. There still remains a problem when smoothing and ocean are enabled and you might get some missing polys on the simulator border...

Cheers!

[ijzerman86]

Hi Svetlin, many thanks for looking into it!
Whats was the problem in the end, a bug of some sorts?
Will download the latest nightly tomorrow.
@simulation border, i will just render a few pixels more and crop in post, no problem.
Many thanks again!

[Svetlin.Nikolov]

Indeed, it was a bug Thank you very much for reporting this!

[ijzerman86]

Hi Svetlin,
I installed the nightly from the 14th. I made a new sim and the problem is the same. It goes away when i only enable use embree and dont tick the use embree for mb box.
Using mb on a ocean without embree for mb enabled takes ages. Any thoughts on this?
Thanks in advance!
:edit:
Rendered a longer sequence and the problem is still there, also with just embree enabled.

[Svetlin.Nikolov]

Hey,

Can you send us the scene where you get the problem? Does it work for you with the scene you already sent us and the nightly build?

Thanks!