Hans-Detlev Fink <hdf### [at] pecosde> wrote:
: No, this is exactly how "nature works". If you have a pure
: red ball (1,0,0) and pure green light (0,1,0) shining upon
: it the ball will look black.

  Not exactly. In most objects there's a specular reflection of the light
from the object surface which will make a light source colored spot.

-- 
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/

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