[osg-users] sorting polygons

Perry Miller perry at modelspace.com
Fri Oct 26 21:22:25 PDT 2007


Hi Gerrick,

This class works well for us:

http://cadkit.svn.sourceforge.net/viewvc/cadkit/trunk/OsgTools/Callbacks/SortBackToFront.h?view=markup
http://cadkit.svn.sourceforge.net/viewvc/cadkit/trunk/OsgTools/Callbacks/SortBackToFront.cpp?view=markup

BSD license. Hope it helps.

Per

On 10/26/07, Gerrick Bivins <biv at iastate.edu> wrote:
>
> Hi All,
> Sorry if the question is too vague.We're a bit perplexed about depth
> sorting of polygons in OSG.
> We've been trying to get some vis working that uses Geometry (display
> lists or vbo's) where the primitives in
> Geometry need to be blended back to front and we're seeing strange
> results. The original view has
> the correct blending however as we navigate around, blending isn't
> correct. We've been diggin around
> and it seems that OSG only does sorting down to the drawable level. Is
> this the case? If so, does anyone
> one have idea on how to efficiently sort and then blend polys in OSG ? If
> not, how do we change things up
> so that OSG does sorting on the polys?
> Thanks for any ideas here, cuz we've been mulling over this for a few
> months. I originally thought it was
> our implementation (we initially mixed pure gl calls in OSG drawable
> similar to the teapot) but I have
> since rewritten our pipeline to use OSG calls and another developer in our
> group implemented an effect
> that requires this type of blending and he is seeing the same thing I am.
> biv
>
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>
>
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