In article <3D2389CA.9E4E78B2@hotmail.com>,
 Tor Olav Kristensen <tor### [at] hotmailcom> wrote:

> I think that my RayIntersectsTriangle() macro in the code below
> provides such a shortcut (*), but I'm not sure yet if it is optimal.
> 
> (*) Not really for lines, but for rays (which has a defined direction)

I haven't really been following this conversation, so I might be missing 
something, but wouldn't this be a better way?

#macro RayIntersectsTriangle(pRay, vRay, pA, pB, pC)
    #local iNorm = < 0, 0, 0>;
    #local tmpTri = triangle {pA, pB, pC}
    #local Scrap = trace(tmpTri, pRay, vRay, iNorm);
    (iNorm.x != 0 | iNorm.y != 0 | iNorm.z != 0)
#end

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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