Hi,
J.P. Delport wrote:
> Hi,
>
> seems like the matrix.getrotate is broken again. 'osgunittests quat'
> also reports lots of problems.
sorry, I've spoken too soon. Matrix.getrotate is fine. The unittests
report false positives (q = -q is OK), will fix this.
For your problem angles, quat(angle,axis) = -1 * osgTrans.getRotate(),
which is fine ito the rotation. It seems that quat.getRotate is the
culprit. Still looking...
jp
>
> I'm comparing with old working versions, will let you know.
>
> jp
>
> [EMAIL PROTECTED] wrote:
>> I've run into a problem using Quaternion rotation with osg::Matrixd that I
>> can't seem to figure out. Consider the following test example and resulting
>> output:
>>
>> #define DEG2RAD(d) d*(2*M_PI/360.0)
>> #define RAD2DEG(r) r*360.0/2*M_PI
>>
>> void testQuaternionRotation()
>> {
>> osg::Matrixd osgTrans;
>> osgTrans.set(osg::Matrix::identity());
>> osg::Vec3f axis(0.0,0.0,1.0);
>> double osgTransAngle,osgQuatAngle;
>>
>>
>> printf("\n*** Doing a 360 deg quaternion rotation about z-axis using
>> OSG ***\n");
>> for(int i = 0; i < 360; ++i)
>> {
>> double angle = DEG2RAD(i);
>> osg::Quat quat(angle,axis);
>> quat.getRotate(osgQuatAngle,axis);
>>
>> //Set the quat rotation on matrix
>> osgTrans.setRotate(quat);
>> quat = osgTrans.getRotate();
>> quat.getRotate(osgTransAngle,axis);
>> printf("Rot: %.1f osgQang: %.1f osgTransAng:
>> %.1f\n",RAD2DEG(angle),RAD2DEG(osgQuatAngle),RAD2DEG(osgTransAngle));
>> }
>> }
>>
>> Output:
>> Rot: 268.0 osgQang: 268.0 osgTransAng: 268.0
>> Rot: 269.0 osgQang: 269.0 osgTransAng: 269.0
>> Rot: 270.0 osgQang: 270.0 osgTransAng: 90.0
>> Rot: 271.0 osgQang: 271.0 osgTransAng: 89.0
>>
>> Reading back rotation angles in the 4'th quadrant gives me invalid values. I
>> would have expected to either get negative angle or the angle that I used to
>> rotate about the z-axis. Am I missing a elementary consept here or is this
>> an actual bug in the implementation?
>> Setting the matrix using a quaternion with angles from the 4'th quaderant
>> seems to be working just fine, it's only reading it back that doesn't work.
>>
>> Thanks for any help on this,
>> Filip
>> _______________________________________________
>> osg-users mailing list
>> [email protected]
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
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