[osg-users] OverlayNode, offscreen rendering, texture projection

[Amos Smith]

I'm curious if OverlayNode can be used to project offscreen rendering results onto geometry?  For example, if in osgsimulation example the cessna itself were rendered offscreen (did not appear in scene), while maintaining the 'shadow' projection onto the globe.

I'm also curious if OverlayNode is the correct mechanism to consider for projection of an image file onto terrain at specific coordinates?  It seems that a  subset of OverlayNode would provide the projection of a texture onto geometry, but I'm not sure what extent of the OverlayNode could be 'bypassed' in the case where I'm starting with texture rather than rendering a model into texture first.

Suggestions & references to relevant examples would be most appreciated.

Thanks in advance,

Amos

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