How Camp wrote:
> 
> Now, please be patient with me, Christoph, but I'm still not sure I
> understand your above explanation.  If the statistics are informing me
> of how many intersections tests were performed, and of those how many
> hit my object... then why *doesn't* that mean 'higher percentage =
> better'?  If 100 tests are performed inside a given bounding box, and
> the bounding box perfectly matched my object in size and shape...
> shouldn't I get a hit percentage of 100%?

First of all the bounding box will of course never perfectly match the 
object.  Therefore if you have 100% hits this usually means the object 
completely fills the view in which case it would be faster not to use 
bounding for this object at all.

> You mention that low percentages indicate potential problems.  Er, how
> low is 'too low'?  I realize there isn't a simple answer to this, but
> is there a broad rule-of-thumb I could use to help me start paying
> better attention?

No, it depends on the type of object and how it is placed.  Imagine for 
example a torus with a very low minor radius - you will always get a low 
hit rate for it.

Christoph

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Last updated 07 Mar. 2004 _____./\/^>_*_<^\/\.______

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