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Smoothing folds
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Smoothing folds // Archive: Tech Forum
Post by weaveribm // Jul 4, 2008, 3:10pm
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weaveribm
Total Posts: 592
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Is there a way to smooth these very sparkley facets for a piece of cloth (using ClothMotion) please?
I'm sure that faces like this can be much smoother and more clothlike in TS but I'm not sure what I'm looking for. The cloth here is a simple plane object quad-divided with no thickness. I've tried FSAA and unsuccessfully nurbs. If I keep quad-dividing (the logical progression to get rounder folds) ClothMotion doesn't like it. I think it might be some very basic rendering-thing I'm missing sorry :)
Freshly re-installed 7.5
Peter
http://i117.photobucket.com/albums/o63/Mington/clothfacets.jpg |
Post by transient // Jul 4, 2008, 4:17pm
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transient
Total Posts: 977
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Planes are double sided by default. This was causing me grief in Dribble, maybe clothmotion isn't liking it either? |
Post by nowherebrain // Jul 4, 2008, 4:49pm
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nowherebrain
Total Posts: 1062
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One big debate with cloth is the tesselation/divisions to use, the best and possible only completely planar poly is a triangle. Tringles don't smooth/subdivide well. Unfortunately I have no clear advice on this issue, if you know where you want the folds, then you kow where to divide your mesh...otherways tinker away.....I guess.
BTW: Transient has a good point. just check "single sided" when creating plaes in tS. |
Post by Jack Edwards // Jul 4, 2008, 5:12pm
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Jack Edwards
Total Posts: 4062
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This is an issue with normals. Did you set the material to smooth?
If it is, then it could be that the normals are not being recalculated based on the changed positions. So you need to resmooth after each frame. |
Post by kena // Jul 4, 2008, 7:40pm
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kena
Total Posts: 2321
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the way I fixed that with my tablecloths way back when was to turn the polygons from squares to triangles:
13088 |
Post by weaveribm // Jul 7, 2008, 1:34am
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weaveribm
Total Posts: 592
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Thanks all, triangles will do- Jack can I ask you for more on these please?
Did you set the material to smooth?
How do I set the material to smooth, that sounds good it's default I think
If it is, then it could be that the normals are not being recalculated based on the changed positions. So you need to resmooth after each frame.
Sorry Jack- I know about normals but I don't know how to re-smooth after each frame can you tell me how to do that please?
Peter |
Post by TomG // Jul 7, 2008, 2:55am
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TomG
Total Posts: 3397
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For normals, in Model side (if this is clothmotion then I guess that is where yo uare working) you would change the settings in the shader, for Autofacet. This should allow smoothing to work, you may need to repaint the object after clothmotion is applied to ensure the material is smoothing across all the faces.
You could try using Smooth instead of Auto Facet, try adjusting the Auto Facet angle, or try painting with Faceted just to get a clearer picture of what is going on during testing.
Let us know how it works out!
Tom |
Post by weaveribm // Jul 7, 2008, 11:50am
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weaveribm
Total Posts: 592
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Model side yes Tom, Autofacet that sounds very interesting- I'll let you know how it goes thanks very much for your help all!
I have had smooth TS cloth in another life, it'll be the new Vista x64 install settling in. Fairly amazed that ClothMotion even works :)
Hmm looking closer the cloth is smooth in parts out of the spotlight: beam top right to bottom left.
<starts looking up 'Angle of Incidence'> :)
Peter |
Post by Jack Edwards // Jul 7, 2008, 11:53am
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Jack Edwards
Total Posts: 4062
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As Tom said it's the facet/autofacet/smooth setting on your material.
Unfortunately since cloth motion is a plugin and TS probably isn't updating the normals after the geometry change, you probably have to manually re-smooth the normals (using the material editor) before each frame is rendered out... :( |
Post by TomG // Jul 7, 2008, 12:33pm
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TomG
Total Posts: 3397
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Spotlight leads to another idea, is it using mapped or ray shadows? Mapped can sometimes have odd interactions with a surface. Just a thought, may have no bearing on it.
Thanks!
Tom |
Post by Burnart // Jul 7, 2008, 12:35pm
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Burnart
Total Posts: 839
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Definitely make sure the material setting is smoothed I've also used subdiv prior to rendering and its worked fine. |
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