NVil Forum
General Category => Bug Reports => Topic started by: samardac on April 11, 2014, 01:42:33 pm
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Why when creasing in Nvil I get this wavy topology?
In Cinema 4d everything looks smooth, check it:
(http://s18.postimg.org/v5i1zuavt/image.jpg)
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Silo also looks good:
(http://s18.postimg.org/xvezdxi8p/Start_jpg.jpg)
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IStonia, I understood what is the problem with Creas.
When I subdevide object with creas one by one, subd +1, subd +1, subd+1, subd+1 I have nice geometry look at first object. But when I subdevide at once Subd +4, I have this waved topology look at object 2.
I think now it will be easer for you to fix it.
(http://cdn.joxi.ru/uploads/prod/2014/04/13/a69/c85/337e311fccebc9bdcfa7d3a1e5c0489a08b55175.jpg)
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Try this
http://www.digitalfossils.com/Download/NVil-Apr-11b-14.rar
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Now it works but works very interesting it creates loops around creased edges in subd more than +3 Now I do not understand it is good or not.
(http://s12.postimg.org/4bz0adg1p/NVil_1_0_2014_Apr_11b.jpg)
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I made quick test looks like it now made subdevision not evenly. Check screens (subd +2)
Nvil
(http://s29.postimg.org/9m8lf8d9z/NVil_1_0_2014_Apr_11b_jpg.jpg)
Cinema 4D
(http://s29.postimg.org/63wliucdz/CINEMA_4_D_R14_042_Studio_Untitled_1_jpg.jpg)
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Maybe what you are looking for is not crease subdivision. Have a look at this tool, polygon mode > Geometry > Subdivision.
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Istonia, no I want to make subdivision with creased edges. Check this video I recorded. Check how topology looks in C4D after subd with creased edges. All the polygons are even. The same result is in Silo and Max. Onli in Nvil polygons are not even.
http://youtu.be/kjMdKBXFz5w
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As far as I know, Cinema 4d uses hypernurbs with edge weights(similar to knots in Nurbs), not Sub_d with edge crease weight.
I think what is being looked for here, is sub_d with edge breaks.(I have also seen it referred to as sub_d with hard_edges). For example, with Wings 3d, you add hard_edges to the model where you want sub_d edge breaks.
With sub_d with edge breaks, the selected edges act as a break/border between the surfaces that are sub_d smoothed. (it works similar to "Smooth groups" but adds new geometry)
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Steve, Check this video I show in it how it works in Silo. As you can see all the polygons are even, like in C4D.
https://www.youtube.com/watch?v=S4SUieGo0Uk&feature=youtu.be
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May be I do not not know something, so excuse me. I do not know all technical stuff just what I know is how creas works in some other apps. So let me know logic of creas in Nvil may be I do not know how it expected to work, may be some links to read. And also why it differ from C4D for example?
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It is done intentionally to have more edge loops close to creased edges to have a nice rounded corner with lower subdivision level. For example, with the box, make the subd level to 4 and do not crease it fully.
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Hi IStonia,
From your reply, the problem appears to be that you have mixed in "edge_tension" with "crease_edges"(attempted sub_d smoothing mixed with visual_smoothing) but have not given direct control of the "edge_tension"(visual_smoothing) applied.
If the user wants edges moved for visual_smoothing, would it not make more sense to let the user control that, or at least leave it for the user to decide if they even want support_edges for visual_smoothing?, or maybe they prefer adding hard_edges?
As it is now, the moving of those edges can too easily create bad geometry.
I do not use sub_d, to me it just adds lots of polygons where not needed.
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What - Bias made? Can not understand.
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Hi,
Have some problem,
check this screen both objects has the same subD level - 3.
Red edges are creased. First object was Subd+1 and then apply and this way 3 times to achive subd - 3.
Secon was just subd +3.
As you can see first object has smooth creased edges and it is bad. Becouse for example I start to work made all creases and then I need to apply one level subd, and after that I have no this sharp creased edges they become smooth... Is it possible to fix?
(http://cdn.joxi.ru/media/cache/thumbnail/uploads/prod/2014/05/12/9fb/8af/267baf7bed9fcab9ff8b235ec256843b3da0995f.jpg) (http://joxi.ru/TYNwU_3JTJAuU_YBaxM)
(http://cdn.joxi.ru/media/cache/thumbnail/uploads/prod/2014/05/12/862/fac/a7f5e7fc5db070796ea160d8a909e3390158df96.jpg) (http://joxi.ru/1oNwUxjKTJCRRsDuF90)
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Another words now I understand to have good creas you have to run subd no less then +2. +1 do not make any good subd. Can it be fixed?
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Sorry, it is not possible because the logic must run all the way from base mesh to sud mesh. When you collapse the subd mesh, the base mesh is lost. There is no perfect way to go backward to extract the base mesh, especially in cases of crease subd.