[vtkusers] Mesh visualization

[Mark Beall]

Will,
Do you think that rather than just an on/off flag it would be possible
to have an enumeration of values to allow this to be done in different
ways. In addition to the two methods that we have right now
a third would be to use stenciling (which is slower, since the lines
have to be rendered twice, but should result in the best possible
image). 

mark

>Hi Folks-
>
>In response to Patrick Lagace's request I've added a flag in vtkMapper to 
>address the issue of
>rendering coincident points/lines on top of polygons. I did not use 
>Patrick's glPolygonOffset()
>call (which works splendidly with lines) but rather I used the 
>glDepthRange() to adjust z-buffer 
>mapping. (Bob Obara at Simmetrix actually was the one who implemented it 
>initially.) The reason 
>that I did not use the glPolygonOffset() approach is because it did not 
>address the point/line 
>coincident problem, that is, you might want to show points on top of lines 
>on top of polygons. 
>
>Anyway, the flag is ResolveCoincidentPrimitives (and there is a global flag 
>GlobalResolveCoincidentPrimitives) in vtkMapper. (I don't like the name, 
>if there are other
>suggestions I'd like to hear them.) It works for OpenGL currently. The 
>name could change
>in the future, and we might even consider making the rendering process 
>always do it. 
>
>I'd appreciate giving it a try and seeing what you think. It's in CVS or 
>available tomorrow in
>the nightly release.
>
>Will
>
>
>
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