Path: chuka.playstation.co.uk!scea!peter_alau@playstation.sony.com
From: jamin1@psu.edu (Jamin Frederick)
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: RotMatrixBUG????
Date: Thu, 09 Jul 1998 20:38:16 GMT
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>
>>Now what do I have to do if I have a button for each rotation
>>direction, positive and negative around each axis, and i want to
>>rotate the object arbitrarily without using the "incremental" method?
>>Apparently I can't just increment/decrement the numbers in the (a,b,c)
>>vector when I push the corresponding buttons.  
>
>Is it a problem to just rotate by small amounts each press?
>
No, that's how I was doing it -- I would get the new change in
rotation angles input by the user and apply this vector (after
matricising it) to the coord matrix -- and i didn't even notice
distortion.  But I was under the impression that everyone was using
the "consummate" start-from-scratch method of RotMatrix with the angle
vector.  I haven't got it to work with the way given above, though.
Once I rotate the model around one axis, following rotations are
screwed up, like the original posted problem, I guess.


Jamin