Not really following what you are after, but one point: 2009/12/31 Ümit Uzun <[email protected]>
> Hi Paul, > > Thanks for your reply. I need only one explanation about that; > > //////////////////////////////////////////////// psudo code > Matrix matrix1= identity; > matrix1->rotate( 10 degree on LOCAL X axis ) > matrix1->rotate( 10 degree on LOCAL Y axis ) > matrix1->rotate( -10 degree on LOCAL X axis ) > matrix1->rotate( -10 degree on LOCAL Y axis ) > > matrix1 is NOT IDENTITY at last. > ///////////////////////////////////////////////// > No it won't be the identity, you've got the undo in the wrong order. Matrix matrix1= identity; // rotate matrix1->rotate( 10 degree on LOCAL X axis ) matrix1->rotate( 10 degree on LOCAL Y axis ) // un-rotate matrix1->rotate( -10 degree on LOCAL Y axis ) matrix1->rotate( -10 degree on LOCAL X axis ) ASSERT(matrix1 == identity); If you want undo, just use matrix invert, which will work unless you've got a scale by 0 in the transform. -- http://www.ssTk.co.uk
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