Jim Wilson writes:
> 
> Norman Vine <[EMAIL PROTECTED]> said:
> > 
> > Put simply the matrix math used supports a 'restrained' cylindrical viewer 
>  
> That is a problem, but it isn't the issue here.  

There is a singularity in the math model which in effect snaps the orientation
of the model 180* when the mouse wraps in the vertical sense

Cheers

Norman

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