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What's the best way to create a "texture-snapshot" of a 3D plane?

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Joined: 2006-11-17

Hello, my intention is to use a top view, set in parallel projection, with axis x=0,y=100,z=0 for picking up a snapshot of a 3D plane positioned at origin, obviously "y" depends by dimensions of the plane (I have also problems to understand why I must use View.setScreenScale to obtain a depth effect).

The problem comes when I want to grab an hi-res screenshot image, because the texture size is always limited by the monitor size.

I tried using some offscreen buffer, but it seems that it must be of the same size of the source onscreen canvas... so in brief how can I create a topographic texture?