pfFrustContainsBox

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Spencer, Dan (DSR++at++trasys.be)
Wed, 28 Aug 96 17:33:00 +2

Problem:

     I am trying to use the pfFrustContainsBox function for collision
avoidance.
First of all I set up the variouse volumes required (boxs frustums etc),
then transform them using pfMultMat and pfOthoXformFrust etc.

     This workd fine for box - box intersection but when I try to detect
collisions between a frustum (any type, perspective or orthoganal) and a
box, the pfFrustContainsBox function behaves like the pfBoxContainsBox
function (i.e. the distinctive shape of the frustum appears to be replaced
by a box which perfectly encloses the frustums dimensions).

     Could it be that the function is approximating the frustum to a box for
performance reasons (PFIS_MAYBE is returned) ?
 If so how can I force it to be more accurate (regarless of performance
costs) ?

     Thanks for any help,

     Dan.
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