On 07/29/2015 02:46 AM, MichaelJF wrote:
> I never learned of such a built-in function, but I think the following test will
> not increase the parse time dramatically. [snip]
>
>     [snip]
>
> #declare ObstacleHit=false;
> #if (vlength(Test)>0) // trace successful
>     #if (vlength(TestDirection)>vlength(Hit-Pt1) )
>        #declare ObstacleHit=true;
>     #end
> #end

Thank you.  I was afraid to try anything involving vlength() because of 
the implicit square root calculation, but your idea turns out to be 
faster than the other ideas I tried.

It seems that the complexity of the SDL makes more of a difference than 
the complexity of the underlying calculation, at least in this case. 
This now has me wondering what an LR(k) parser would do for POV-Ray 
parse times.

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