plib-users

[Plib-users] intersection MAX_HITS limitation

[<lo...@sl...>]

All of the code in PLIB that deals with intersection testing (ssgIsect, 
ssgHOT, etc.) has a limit of returning 100 records of hit data (see 
http://plib.sourceforge.net/ssg/non_class.html and the code, look for 
MAX_HITS).  Was this an arbitrary limit or a technical limit?  The reason 
I ask is because it seems to be an awfully low limit in my opinion but 
maybe that's because I'm missing the reasoning behind it being 100.

Thanks for any info,

Jeff Long


PGP public key at http://www.slothmud.org/~long/long.gpg

Re: [Plib-users] intersection MAX_HITS limitation

[Steve B. <sjb...@ai...>]

lo...@sl... wrote:
> All of the code in PLIB that deals with intersection testing (ssgIsect, 
> ssgHOT, etc.) has a limit of returning 100 records of hit data (see 
> http://plib.sourceforge.net/ssg/non_class.html and the code, look for 
> MAX_HITS).  Was this an arbitrary limit or a technical limit?  The reason 
> I ask is because it seems to be an awfully low limit in my opinion but 
> maybe that's because I'm missing the reasoning behind it being 100.

I think it's an arbitary limit...I don't think it's awfully low - to the
contrary - it's rather unusual to actually intersect more than a handful
of triangles.  Remember this is using an infinitely thin ray and only
recording triangles that were actually intersected.  I think 100 is actually
a rather generous limit.

Still - it's only memory - so if you feel a desperate need to increase it,
please feel free.

I'd be suspicious of poor design elsewhere if there truly were more than
100 triangles in line for an intersection request.

----------------------------- Steve Baker -------------------------------
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