That was quick .. Thanks Paul ! Nick
http://www.linkedin.com/in/tnick Sent from Devlet, Ankara, Turkey On Sat, Jan 23, 2010 at 8:10 PM, Paul Martz <[email protected]> wrote: > Trajce Nikolov wrote: > >> Hi, >> >> does anyone knows what this matrix should look like ? >> > > In row major form, the general orientation matrix is: > > Xx Xy Xz 0 > Yx Yy Yz 0 > Zx Zy Zz 0 > 0 0 0 1 > > ...where X is the new x axis, Y the new y axis, and Z the new z axis. > > Matrices don't really know the meaning of the word "up"; that's a > subjective term we use. So when you ask for a matrix that converts y up to z > up, you're really asking for a matrix that replaces the y axis with the z > axis. Here's one matrix that does that: > > 1 0 0 0 > 0 0 1 0 > 0 1 0 0 > 0 0 0 1 > > There are other ways to make a "y up to z up" matrix, that's just one way. > The way you actually choose to compose this matrix will depend on what you > want for the x and z axes in the new coordinate system. In the matrix above, > I just swapped y and z, and left x unchanged. > > An alternative would be to negate the new z axis: > > 1 0 0 0 > 0 0 1 0 > 0 -1 0 0 > 0 0 0 1 > > -Paul > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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