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Re: Loop Adaptive Subdivision Problem

Posted by Settgast on March 14, 2005 at 06:20:06:

In Reply to: Re: Loop Adaptive Subdivision Problem posted by ati3414 on March 14, 2005 at 00:01:09:

: In my work, I noticed that while the tesselation changes based on the distance to the viewer the normals have to be attached to points on the surface, any other combination produces a "shimmer" effect destrying lighting under animation. By contrast, subdivision surfaces subjected to subdivision (either fixed or adaptive) should exhibit this shimmering artifact since there is no symbolic representation of the final surface, each approximation producing new vertices, none of which residing on the same surface.

We used the subdivision rules by Catmull Clark and Loop. For those there are so called limit point and limit normal rules available.
(Biermann, Levin, Zorin: "Piecewise Smooth Subdivision Surfaces with Normal Control" e.g.)
There is no shimmer effect and all the points are on the surface.

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: : In my work, I noticed that while the tesselation changes based on the distance to the viewer the normals have to be attached to points on the surface, any other combination produces a "shimmer" effect destrying lighting under animation. By contrast, subdivision surfaces subjected to subdivision (either fixed or adaptive) should exhibit this shimmering artifact since there is no symbolic representation of the final surface, each approximation producing new vertices, none of which residing on the same surface. : We used the subdivision rules by Catmull Clark and Loop. For those there are so called limit point and limit normal rules available. : (Biermann, Levin, Zorin: "Piecewise Smooth Subdivision Surfaces with Normal Control" e.g.) : There is no shimmer effect and all the points are on the surface.

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