Artifacts and crashes when rendering trails as hair 4.05 Tweet

[byMELT]

Hello,

This past week has been horrible with every scene consisting of trails rendering as hair has crashed a lot and had many frames with artifacts. We use x-particles trails, but it also happens when they are baked to alembic.

It happens in different scenes, on 3 different machines with different OS (2x win10 and win 7).

Octane 4.05-R7, C4D R20 and R21

It happens in both complex and simple scenes.

Here are some examples:
https://imgur.com/a/IddyFDa

Bug report from recent crash:

_BugReport.zip

(126.72 KiB) Downloaded 132 times

What to do? I can't go back to Octane 3 (this scene rendered just fine couple years back).

[aoktar]

It's a crash on the renderer not plugin. Please post a sample scene and description how you get crashes. Also what's your driver version?
And what's artefacts you see, mark in pictures

[byMELT]

Hey Ahmet, thanks for getting back.

Sample scene here:

BUG_TRAILS.zip

sample scene

(122.5 KiB) Downloaded 119 times

Marked pictures:

Untitled presentation.pdf

marked pictures

(1.69 MiB) Downloaded 138 times

Video with artifacts: https://vimeo.com/388826026/497140529b - particles are still small and slow, so everything you see are artifacts. this scene rendered fine a couple years ago.

Crashes are scene dependent and can happen every few or every few hundred frames. The artifacts are way worse to deal with as nothing helps - no baking, alembic, changing object to hair, nothing.

Drivers:
1st machine: 419.67, win 10, R20
2nd machine: 441.20, win 10, R21
3rd machine: 419.67, win 7, R20

I found 419.67 to be the most stable for my work.

Best,
MELT