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Isosamples

An isoline is a curve parametrized by one of the surface parameters while the other surface parameter is fixed. Isolines are a simple means to display a surface. By fixing the u parameter of surface s(u,v), the iso-u lines of the form c(v) = s(u0,v) are produced, and by fixing the v parameter, the iso-v lines of the form c(u) = s(u,v0) are produced.

The isoline density of surfaces may be changed by the set isosamples command. By default, sampling is set to 10 isolines per u or v axis. A higher sampling rate will produce more accurate plots, but will take longer. This parameter has no effect on data file plotting.

Syntax:

        set isosamples <iso_1> {,<iso_2>}
        show isosamples

Each surface plot will have <iso_1> iso-u lines and <iso_2> iso-v lines. If you only specify <iso_1>, <iso_2> will be set to the same value as <iso_1>.

When a surface plot is being done without the removal of hidden lines, set samples also has an effect on the number of points being evaluated. See set samples.


Matthews Lab
Wed Nov 6 18:16:54 PST 1996