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Groups > comp.graphics.apps.gnuplot > #596

splot with variably translucent points

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I want to visualize a minimization problem over three input variables
and one result.  With only two input variables, the visualization
problem would be trivial.

My thought is to use splot to plot 3D points, with the most opaque
point(s) representing the minima, and more translucent points as it
deviates from the minima.  This way, you should be able to see a
cluster of dark points near the minimum.

How do I set the transparency of each point from the input data?

Without variable transparency, I've got something as follows.  I'd
like to use $4 to control the transparency.
===========
set terminal pngcairo truecolor
set view 60, 136, 1.22, 1.26
splot "-" using 1:2:3 with points pointtype 7 pointsize 2 linecolor
rgb '#444444'
3 -4 -4 37.767
3 -4 -6 37.744
...
end

===========

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splot with variably translucent points fearless_fool <rdpoor@gmail.com> - 2011-09-22 14:47 -0700
  Re: splot with variably translucent points sfeam <sfeam@users.sourceforge.net> - 2011-09-22 19:05 -0700

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