#104: saving display to tiff or ppm garbled when NVIZ is not top window
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Reporter: dylan | Owner: [email protected]
Type: defect | Status: new
Priority: minor | Milestone: 6.4.0
Component: default | Version: svn-trunk
Resolution: | Keywords: NVIZ openGL
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Comment (by glynn):
It's not an OpenGL bug, but a limitation. If you render to a window, the
rendering is clipped to the visible portion (the part that's on-screen and
not obscured by another window). If you read the rendered image (with
glReadPixels()), the clipped portions will contain garbage.
The only reliable way to generate image files using OpenGL is to render to
an off-screen target such as a pBuffer or GLXPixmap. But those require
support from the driver, and we haven't had much luck with either approach
(of course, there might be bugs in the code which creates the pBuffer or
GLXPixmap).
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Ticket URL: <http://trac.osgeo.org/grass/ticket/104#comment:1>
GRASS GIS <http://grass.osgeo.org>
GRASS Geographic Information System (GRASS GIS) - http://grass.osgeo.org/
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