Dear All,
I load a model with the following code in my program, p1 and p2 are osg::Vec3
type variables and simply representingthe 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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