Hello forum,
I am trying to rorate an object continuously through a call back. Before
calling the calback i am doing some affine transformation over that object
The final rendered the scaled down to a tiny object . In the callback
subclass i am overloading the () operator and i am performing the rotation,
not any
kind of scaling down.
**********************code**************************'
class RotateCB : public osg::NodeCallback
{
public:
RotateCB() : m_angle(0) { }
virtual void operator()(osg::Node *node,
osg::NodeVisitor *nv)
{
/*
Normally, check to make sure that we have an update
visitor, not necessary in this simple example
*/
osg::MatrixTransform * mtLeft =
dynamic_cast<osg::MatrixTransform*>(node);
osg::Matrix mR;
mR.makeRotate(m_angle, osg::Vec3(0.0f,0.0f,1.0f));
mtLeft->setMatrix(mR);
//Increment the angle for the next from
m_angle += 0.01;
/*
Continue traversing so that OSG can process
any other nodes with callbacks
*/
traverse(node,nv);
}
.................................
................................
osg::ref_ptr<osg::MatrixTransform> teapotPos = new osg::MatrixTransform;
osg::Matrix teapotTransMat;
osg::Matrix teapotScaleMat;
osg::Vec3f teapotTransVec = osg::Vec3f(5,2,-12);
osg::Vec3f teapotScaleVec = osg::Vec3f(20.1f,20.1f,20.1f);
teapotTransMat.makeTranslate(teapotTransVec);
teapotScaleMat.makeScale(teapotScaleVec);
teapotPos->setMatrix(teapotTransMat * teapotScaleMat);
//SET THE data variance to dynamic to let OSG know that
//we shall modify this node during update traversal
teapotPos->setDataVariance(osg::Object::DYNAMIC);
//SET THE update callback
teapotPos->setUpdateCallback(new RotateCB);
................................................
...................................................
*****************************************************'
Any hint?
Sajjad
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