adding a solidify modifier to cloth produces spike artefact #20562

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Wolfgang Kufner · 2010-01-04T20:49:59+01:00

Wolfgang Kufner commented

2010-01-04 20:49:59 +01:00

%%%The attached animation blend file shows a long spike artefact (at least 95% of runs it is long) for one frame or so.
When the solidify modifier is deleted the spike goes away.
Readding the (default) solidify modifier makes it reappear.
The spike shows up in the viewport and when rendered.

Also attached a png for a quick look at the spike.%%%

%%%The attached animation blend file shows a long spike artefact (at least 95% of runs it is long) for one frame or so. When the solidify modifier is deleted the spike goes away. Readding the (default) solidify modifier makes it reappear. The spike shows up in the viewport and when rendered. Also attached a png for a quick look at the spike.%%%

Wolfgang Kufner commented

2010-01-04 20:49:59 +01:00

Changed status to: 'Open'

marc chambon commented

2010-01-07 14:17:31 +01:00

%%%Hi, I had the same issue, I think this bug can be limited by increasing the resolution. Here is an graphical explanation:
http://www.pasteall.org/pic/765

regards%%%

%%%Hi, I had the same issue, I think this bug can be limited by increasing the resolution. Here is an graphical explanation: http://www.pasteall.org/pic/765 regards%%%

Brecht Van Lommel commented

2010-01-08 16:18:47 +01:00

%%%Confirmed, assigning to Campbell.%%%

Campbell Barton commented

2010-01-11 00:14:49 +01:00

%%%this is caused by the 'Even Thickness' option which works well when you give it geometry like a building or something with fixed edge angles.
In this case the cloth is folding over to almost 180d which causes spikes when trying to maintain even wall thickness.
To do this correctly it would need to have a 'Cap Ends' option which would make the modifier significantly slower (like boolean), so I dont think its worthwhile at the moment.

Disable 'Even Thickness' and you probably wont notice the higher quality normals too. This gives better, faster results for cloth.

It might be worth making even thickness default to off.%%%

%%%this is caused by the 'Even Thickness' option which works well when you give it geometry like a building or something with fixed edge angles. In this case the cloth is folding over to almost 180d which causes spikes when trying to maintain even wall thickness. To do this correctly it would need to have a 'Cap Ends' option which would make the modifier significantly slower (like boolean), so I dont think its worthwhile at the moment. Disable 'Even Thickness' and you probably wont notice the higher quality normals too. This gives better, faster results for cloth. It might be worth making even thickness default to off.%%%

Campbell Barton commented

2010-01-11 00:14:49 +01:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2010-01-11 00:14:49 +01:00

Campbell Barton commented

2010-01-11 00:43:12 +01:00

%%%changed defaults to disable 'Even Thickness'%%%

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adding a solidify modifier to cloth produces spike artefact #20562