On 5/19/2011 1:15 AM, ms yang wrote:
Hi:
I am a beginner of OSG. I have a problem about how can I get the main
camera's rotation relative to x,y,z axis.
I can get the view matrix by osg::Matrix matrix =
viewer->camera()->getViewMatrix(),after I get the view matrix,there is only one
member function getRotate which returns the quat but not the rotation angle
relative to x,y,z axis.
Get the view matrix lookat components:
osg;;vec3 eye, at, up;
view->getLookAt( eye, at, up );
Then get the normalized view direction:
osg::Vec3 viewDir = at - eye;
viewDir.normalize();
Then use linear algebra and trigonometry: The dot product of two unit vectors is
the cosine of the angle between the two vectors.
-Paul
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