I would store the x and y rotations as separate variables. Use them to
compute a single Matrix when you need to update. Test for identity by
checking to see if your x and y variables fall within an epsilon range
of zero.
Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ <http://www.skew-matrix.com/>
+1 303 859 9466
Ümit Uzun wrote:
Hi All,
I have a problem about rotating one MatrixTransform node with 2
different Matrix which one of responsible for rotation on X by
osg::X_AXIS and one of responsible for rotatin by osg::Y_AXIS.
I have done some rotation to MT node but after this operations I am
waiting to get Identity matrix for MT which has Identity matrix in
initial state.
Some psudo codes;
-------------------------------------------------
// Initial states
osg::MatrixTransform* MT;
MT->setMatrix( osg::Matrix::identity() );
osg::Matrix ang1 = osg::Matrix::identity();
osg::Matrix ang2 = osg::Matrix::identity();
// Updates done with this codes
ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f),
osg::X_AXIS)));
ang2.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f),
osg::Y_AXIS)));
MT->setMatrix(ang2 * ang1);
-------------------------------------------------
if I rotate my MT by above code; model rotated on Y by localCoordinate
axis and rotated on X fixedCoordinate axis. But I wanted to rotate on X
local coordınate axis too.
If I use one matrix to update rotation;
-------------------------------------------------
// Initial states
osg::MatrixTransform* MT;
MT->setMatrix( osg::Matrix::identity() );
osg::Matrix ang1 = osg::Matrix::identity();
// Updates done with this codes
ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f),
osg::X_AXIS)));
ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f),
osg::Y_AXIS)));
ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(-10.0f),
osg::X_AXIS)));
ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(-10.0f),
osg::Y_AXIS)));
MT->setMatrix(ang1);
-------------------------------------------------
With above code I can rotate my model X and Y local coordinate axis. But
this code has lack too.
After apply positive and negative way rotation I am waiting to get
IdentityMatrix but after all rotation operation my MT->getMatrix() give
me different from IdentityMatrix. I think I should use inverse matrix
instead of negative direction rotated matrix to rotate -X or -Y
direction. Could it solve my problem or not?
By these 2 rotation operations my main goal is that; I want to rotate MT
by X and Y local coordinate system. And after all rotations I can get
initial state of MT. I mean I apply to many rotation transformation to
my unique node and after all dual(for X and -X or for y and -Y with
unordered queue) operation I want to get first initial matrix for my MT
node.
I know this is not hard operations, but I am unstable about choosing
which one is right way.
I appreciate any comments.
Regards.
Ümit Uzun
------------------------------------------------------------------------
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