Hello Michael,
On 02/16/2011 01:28 PM, Michael Raab wrote:
> My colleague prepared an example that produces more material changes
> than expected.
> On thing I noticed is that the number of material changes depends on the
> camera position.
> May that issue be related to transparency sorting/rendering?
yes, the bottom row of cubes (blue-ish) has a BlendChunk with
_sfDestFactor = GL_ONE_MINUS_SRC_ALPHA, so OpenSG has to consider it
transparent. If you then look at the appropriate angle the blue and gray
cubes have to been drawn alternatingly to maintain back to front sorting
and you get the additional state changes.
Cheers,
Carsten
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