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Isosurface
The Isosurface representation computes and draws a surface within
a volumetric data field, on a 3-D surface corresponding to points
with a single scalar value. There are several settings which
control how the isosurface is displayed. The ``Box Only'' control
causes the volume data bounding box and coordinate axes to be
drawn rather than the isosurface for the data. This is often useful
when first working with volumetric data, and checking that the
coordinate systems of the volume data and the molecule match.
The wireframe control can be set to 0, 1, or 2. When the wireframe
control is set to 0, the isosurface is drawn using a solid
space filling representation. When the wireframe control is set to
1, the isosurface is drawn using lines. When the wireframe control
is set to 2, the surface is drawn using only points at the appropriate
isovalue samples. The Isoval control selects the value for which the
isosurface will be computed. The VolID control selects which volume
dataset is used for the isosurface calculation, since a given molecule
can contain multiple volumetric data sets. This and other volumetric
display features will be greatly expanded in forthcoming releases of
VMD.
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