Re: [ggt-devel] setRotX()?

[<ba...@in...>]

Well, what I want is to rotate Axis 
component of AxisAngle, but only 
around one axis.
something like this:

//rotate around Z axis

gmtl::AxisAnglef aa;
float oldx = aa[1], oldy = aa[2];
aa[1] = oldx*cos(theta) - 
oldy*sin(theta);
aa[2] = oldx*sin(theta) + 
oldy*sin(theta);

It would be simpler and more 
readable to write

gmtl::setRotZ(aa, theta);

kevin meinert wrote:

 > If you have come code (or pseudo 
code) in mind, post it to the list, 
we'll
 > take a look to see what specific 
functionality you need, and if it is
 > something that we forgot in gmtl, 
we'd be happy to include it.
 >
 >
 > For an AxisAngle, isn't rotation 
about one axis simply setting the axis
 > and the angle?  I'm not sure what 
more you could want.  Maybe when you
 > post the code I'll understand better.
 >
 > 
*--*---*---*----*-----*------*------*-----*----*---*---*--*
 > Kevin Meinert 
      /_/
 > home - 
http://www.vrsource.org/~kevin 
      \        /
 > music - 
http://www.subatomicglue.com 
    \/  __    \/
 > 
                   \__
 > 
            \_\
 >
 >
 >> kevin meinert wrote:
 >>
 >>> can't you set the angle/axis 
directly on the AxisAngle class?  I 
don't
 >>> have the code handy to look at 
so I'm guessing...
 >>>
 >>> there's probably a setter or a 
constructor for this...
 >>
 >>
 >> yes, there is operator[] and I can
 >> do it by hand.
 >> But I think it would be simpler for
 >> the programmer to have separate
 >> functions to do rotation around one
 >> axis.
 >> I can contribute these, if you want.
 >>
 >>
 >>> 
*--*---*---*----*-----*------*------*-----*----*---*---*--*
 >>> Kevin Meinert 
        /_/
 >>> home - 
http://www.vrsource.org/~kevin 
      \        /
 >>> music - 
http://www.subatomicglue.com 
    \/  __    \/
 >>> 
                    \__
 >>> 
             \_\
 >>>
 >>>
 >>>
 >>>> Hello,
 >>>> I'm using gmtl(specifically, your
 >>>> AxisAngle class).
 >>>> Currently, I find gmtl's method of
 >>>> rotating axis component of 
AxisAngle
 >>>> representation inconvenient.
 >>>> I have to extract Vec from
 >>>> AxisAngle, build a rotation 
matrix,
 >>>> multiply Vec by it and use setAxis
 >>>> to set the axis component. I 
have to
 >>>> do it even if I need rotation only
 >>>> around one axis.
 >>>> It would be nice if I could write
 >>>> like this:
 >>>>         AxisAngle aa; float 
xangle;
 >>>>         gmtl::setRotX(aa, xangle);
 >>>> Or maybe I just don't understand
 >>>> something about Axis-Angle
 >>>> representation?
 >>>>
 >>>>
 >>>>
 >>>> 
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 >>>
 >>>
 >>>
 >>
 >>
 >>
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