Rick, another thought....
rspinney wrote:
A slice through a cube would have one value defined by the user (i.e. a
slice at X=0). The surface could then be color coded by the value of the
grid point from the cube file.
Alternatively, one could see "x=0" as defining that surface onto which
the desired cube file is mapped. In that case, any plane -- diagonal
or not -- could be defined. All you would need is a linear expression
in x, y, and z, and test for > or < 0. So:
x the yz plane
y the xz plane
z the xy plane
x-3 the plane parallel to the yz plane, though (3,0,0)
x-y the plane perpendicular to the xy plane going through x = y.
x+y the plane perpendicular to the xy plane going through x = -y.
x+y+z the oblique plane through (0,0,0), (1,-1,0), (1,0,-1)
That is, the plane would be defined by a set of four numbers:
{x,y,z,w}
{1,0,0,0} the yz plane
{0,1,0,0} the xz plane
{0,0,1,0} the xy plane
(1,0,0,-3} the plane parallel to the yz plane, though (3,0,0)
{-1,1,0,0} the plane perpendicular to the xy plane going through x=y
{-1,-1,0,0) the plane perpendicular to the xy plane going through x=-y
{-1,-1,-1,0}the oblique plane through (0,0,0), (1,-1,0), (1,0,-1)
Is there some standard notation for this sort of generic plane that we
should be using?
The easy construction of a simple data set along these lines, where
each point is measured relative to its distance from this plane and
having the same dimensions as the designated cube file would do the
job. The JVXL format would allow for any number of predefined planes;
one would still have to use the cube file for generating the JVXL
data, though.
So I propose that this be part of the mapping business. We get that
going, then implement this as a simple addition to the JVXL format.
Bob
--
Robert M. Hanson, [EMAIL PROTECTED], 507-646-3107
Professor of Chemistry, St. Olaf College
1520 St. Olaf Ave., Northfield, MN 55057
mailto:[EMAIL PROTECTED]
http://www.stolaf.edu/people/hansonr
"Imagination is more important than knowledge." - Albert Einstein
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