Isect weirdness

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Scott McMillan (scott++at++ht.com)
Wed, 4 Dec 1996 19:06:11 -0500 (EST)

I have been experiencing some weird behavious using isect....

When I have a normalized direction vector, and a VERY small length
(on the order of 1e-9) Performer outputs a warning message:

PF Warning/Usage: No inverse: singular matrix

When I have a zero length direction vector and a zero length it
doesn't complain at all.

Anybody know why it is doing this? My guess would be that isect
checks for zero length dir vectors in the pfSegSet and handles them
appropriately, but it can't deal with the small numbers that aren't
exactly zero but should be????

scott

-- 
  Scott McMillan  |       HT Medical, Inc.      | Developing virtual environ-
   scott++at++ht.com   |      http://www.ht.com      | ment medical and surgical
 Ph: 301-984-3706 | 6001 Montrose Rd., Ste. 902 | simulations and surgery
Fax: 301-984-2104 |     Rockville, MD 20852     | simulation creation tools.


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