Re: pfCylAroundSegs API

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Jim Helman (jimh++at++surreal)
Thu, 22 Dec 94 12:07:44 -0800

Like the rest of the math functions which take a group of input
structures (e.g. boxes, spheres, etc.), pfCylAroundSegs takes an array
of pointers to segments rather than an array of segment structures.
The reason for this convention in the math API is to reduce the need
for copying dispersed structures into an array of structures just to
pass it to a math routine. In many cases, the time spent doing such a
copy would be comparable to or exceed the time spent in the routine
itself.

This passing convention is usually faster and at worst requires a
pointer copy per input structure.

The latter is the case with a pfSegSet, so you must do something like:

        pfSeg *segp[32];
        for (i = 0 ; i < nSeg ; i++)
                segp[i] = &segset.segs[i];
        pfCylAroundSegs(&cyl, segp, nSeg);

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

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