Re:Re: math.h error popup window
Russell Hind wrote:
Quote
Richard Kaiser wrote:
>
>sqrt: Domain error
>
We get this a lot from acos. Currently doing some 3D work which
involves matrix manipulations and then calculations to yaw/pitch/rolls.
Floating point inaccuracies can lead to vectors who's length is>1
only in a very insignificant digit which can lead to domain errors when
doing dot products and such to calculate angles.
I've ended up wrapping this code to trim the value passed to acos to 1
or -1 if it is within a few decimal places but otherwise throw.
Cheers
Russell
Implimenting direction cosines with quaternians is computer stable,
or easily stabilized...
IEEE has some good articles on this if available,
else if interested please email me;
Bill
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