Chaos Corona for Cinema 4D > [C4D] Bug Reporting

Corona V5 stalls and crashes when rendering screen region

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jamieirvin:
Hi guys,

We have noticed that, when rendering a small region in the viewport, corona has a tendency to stall when computing the secondary GI.  It hangs indefinitely and any attempt to stop it causes C4D to freeze (spinning wheel of doom).  This means we have to force quit so no crash report....

This has only happened with the latest commercial V5 release / C4D R21 / MacOS on multiple machines.

Thanks

houska:
Hi, could you please provide exact steps to reproduce this, so that we can check it on our machines? Does it happen with a specific scene or can it be just a new scene from scratch? We'll be making a hotfix soon, probably, so this fix might be included if we manage to figure it out.

Thanks!

TomG:
Ps on the "freeze so no crash report", you can actually still generate one, see https://help.c4d.corona-renderer.com/support/solutions/articles/12000033461-how-to-report-issues-c4d "How to generate minidump files"

jamieirvin:
Hi,

It's not scene specific, we have had it happen on a number of projects.  However, it does tend to be the 'heavier' ones so is unlikely on a relatively simple scenario.  It is also seems to be limited to small render regions the viewport, say, 5% of the image.  A larger region doesn't seem to attract the same crash.

This doesn't happen in the VFB using Corona's region render.  It only happens in the viewport when doing a quick test using Cinema's render region marquee.

When it freezes, it has only been when computing the secondary GI.   The timer will still run but the region will never render.  When we then click anywhere in the viewport or try 'esc' we get the spinning wheel and then have to force quit.

Next time it happens we will do our best to get a crash report.

TomG:
Thank you for the extra information, and for trying to capture a minidump if it comes up again, much appreciated!

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