Hi Sonya,
Usually you use an cosine-matrix for this. It allows to determine the
quaternion which translates one coordinate frame (i.e. 3 independent
vectors) into another, but I think osg doesn't have this.
I think you can use the makeRotate by applying the resulting quaternion
to the vec3(0,0,1) and (1,0,0) and using the makeRotate with the results
somehow to get the inverse.
Cheers
Sebastian
Dear All,
I load a model with the following code in my program, p1 and p2 are
osg::Vec3 type variables and simply representing
the each ends of object in spatial space ( I also use them to find the
direction vector). What I want to achive is: to place
that model up vector always aligned facing upward ( this doesn't mean
that it must coincidence/be parallel with global
Z axis) to achieve that If I apply the quaternions then object is
positioned with correct direction vector (calulated via
p1, p2) but rolled with arbitrary angle along that direction vector,
which violates my conditional goal.
It also seems that it's not a supprise that it produces that result
bcoz nowhere I specify the crucial right or up vector with
quaternion which is required to position the object in 3D space. So
How am I supposed to correct that effect either with
quaternions or matrices ?
loadedModel = osgDB::readNodeFile("quad.obj");
osg::Vec3Array* verlist= static_cast<osg::Vec3Array*
>(rubber_line->getVertexArray());
osg::Vec3 p1 = (*verlist)[0];
osg::Vec3 p2 = (*verlist)[1];
osg::ref_ptr<osg::PositionAttitudeTransform> Transf = new
osg::PositionAttitudeTransform;
Transf->setPosition( p1 );
osg::Quat quad;
osg::Matrix matrix, mat2;
quad.makeRotate(osg::Vec3(0,1,0),p2-p1);
Transf->setAttitude(quad);
Transf->addChild(loadedModel);
rootnode->addChild(Transf);
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