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There are some issues to consider when using the rendering
commands, which can lead to discrepancies between the scene displayed in
the VMD graphics display window and the image generated by the image
processing application. These issues include:
- The near and far clipping planes are ignored;
- The colors or intensities may be slightly different,
due to different colormaps, gamma values, or lighting models;
- The rendering commands do not
currently support stereo output, so even if the display is currently in
stereo mode, a non-stereo perspective will be used for the rendering program
input script;
- Text is generally not available as a graphics primitive in the
image processor input scripts, so label text will not
appear, although the lines of bond, angle, etc. labels will be drawn. The
only exception is in Postscript output, which supports text output.
- Dotted spheres are not drawn with dots.
- The background color may be black, as not all output formats support
a background color other than black;
- Cylinders will look slightly different; in VMD cylinders are
drawn as cylindrical polygons with N facets, while they may appear as
smooth in the final output (which is generally looked upon as an improvement!)
Sergei Izrailev
Fri Jul 25 17:07:27 CDT 1997