[osg-users] Pick color from scene

Viggo Løvli vigigio at hotmail.com
Tue Jul 29 00:23:35 PDT 2008

I want to do a ray-intersection toward a tree model (as an example) and ignore the hit-location if it contain zero alpha value. Basically this is a line-of-sight-check that take textures into consideration.
I think a good way is to use the existing intersection system and thus produce a list of hit-locations. I will then for each hit location need to figure out what alpha-value it holds. I can then ignore those hit-locations that we can see through.
So, I am looking for a scene-graph color-picker.
Does anybody have something like this that they want to share?
Note: I am not looking for something that use hardware to render part of the scene and then a read-back from hardware. This should be CPU only :-)
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