Modifying illumination shades
- To: mathgroup at smc.vnet.net
- Subject: [mg24367] Modifying illumination shades
- From: Bill Marks <bmarks at helix.nih.gov>
- Date: Wed, 12 Jul 2000 23:13:09 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
The command
ListPlot3D[surface, LightSources-> ls, ViewPoint -> vp]
produces a surface illuminated by the light sources supplied,
whereas the command
ListPlot3D[surface, addedShades , LightSources-> ls, ViewPoint -> vp]
ignores the LightSources option when I use it.
Since I want to add some surface colors "surfaceShades" to those
determined by the illumination, I wrote my own illumination program,
which returns "illumShades".
I then add my surface colors to them and use
ListPlot3D[surface, Apply[RGBColors, illumShades + surfaceShades, {2}], opts]
This works but my illumination program, though Compiled, is slower
than one used by ListPlot3D.
One solution would be a function that returns the actual shades used
in ListPlot3D:
illumShades = MMAFunc[surface, LightSources-> ls, ViewPoint -> vp],
which I would then modify. I have been unable to get those shades.
Any suggestions? For example, is there a way to get the shades
computed by ListPlot3D?
Bill Marks
The command
ListPlot3D[surface, LightSources-> ls, ViewPoint -> vp]
produces a surface illuminated by the light sources supplied, whereas
the command
ListPlot3D[surface, addedShades , LightSources-> ls, ViewPoint -> vp]
ignores the LightSources option when I use it.
Since I want to add some surface colors "surfaceShades" to those
determined by the illumination, I wrote my own illumination program,
which returns "illumShades".
I then add my surface colors to them and use
ListPlot3D[surface, Apply[RGBColors, illumShades + surfaceShades, {2}],
opts]
This works but my illumination program, though Compiled, is slower than
one used by ListPlot3D.
One solution would be a function that returns the actual shades used
in ListPlot3D:
illumShades = MMAFunc[surface, LightSources-> ls, ViewPoint -> vp],
which I would then modify. I have been unable to get those shades.
Any suggestions? For example, is there a way to get the shades computed
by ListPlot3D?
Bill Marks