[osg-users] Draw through a mask

[Jérôme Desfieux]

Hi,

I have an osg::Geometry (a long rectangle above a terrain).
But I want it to be really drawn only through a mask (this mask is for example a small square I can move on the terrain; it reveals the long geometry through it; other parts of the long geometry must not be drawn)

What is the good approach for realizing this task?

(note i am using OsgEarth, but as far as i know it does not provide a such feature).

Thank you!

Cheers,
Jérôme

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