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set_shading question [message #25650]

Thu, 05 July 2001 10:53

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

Hey there,

Can anyone enlighten me as to the LIGHT keyword to set_shading? The online docs state:

LIGHT
A three-element vector that specifies the direction of the light source. The default light
source vector is [0,0,1], with the light rays parallel to the Z axis.

How does one change the direction of illumination? I want to change the shading so I can
specify a source point (say [1,0,1] in a unit cube) and a "destination" point (say,
[0,1,1]) to define the light source direction, i.e. where the light is going *to*. Or is
this stuff like wind direction, i.e. you specify where the light is coming *from*?

thanks for any info

paulv

p.s. I'm using this for shading a surface in SHADE_SURF.

--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
Fax:(301)763-8545 And drinking largely sobers us again.
Alexander Pope.

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set_shading question

By: Paul van Delst on Thu, 05 July 2001 10:53

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