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From: Jo on 3 Apr 2010 07:12
I have a series of line plots which intersect at various points. Is it possible to use some type of color combining to produce nice looking results. e.g., instead of your typical overwriting you take some type of special color space combination.
From: Walter Roberson on 4 Apr 2010 23:10
On 10-04-03 6:12 AM, Jo wrote:
> I have a series of line plots which intersect at various points. Is it
> possible to use some type of color combining to produce nice looking
> results. e.g., instead of your typical overwriting you take some type of
> special color space combination.

Only surfaces rendered by OpenGL support transparency, and OpenGL has a
quirk that when items are in the same plane, which one will be "on top"
is not dependent on the drawing order. Thus in order to do what you want
in a controlled manner, draw each of the line plots as a surface of some
sort (e.g., a patch), and draw them so that the one that should be at
the bottom has the lowest Z coordinate, giving explicit Z coordinates
for all of them.
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