Hi! I am trying to create a C++ class that allow me to move the camera
following a path determined by some points read from a file . As i want too to
give the option to 'fly' with the camera using the mouse, i found in one of the
examples (osgHandGliding) a nice way to do that, so i start from that point and
add new code to allow the path movement, but now i have had a problem, because
the original code uses the mouse events to make rotations, translations... but
now, as the points are determined, there are not mouse events.
I tried to use osg::Matrixd::makeLookAt() function, but the camera seems to
face to another point, not the one i said.
This is the code i am using (only write the parts i am working with):
bool ManipuladorVuelo::handle(const GUIEventAdapter& ea,GUIActionAdapter& us)
{
switch(ea.getEventType())
{
...
case(GUIEventAdapter::FRAME):
if (tipoVuelo == VUELO_LIBRE){ //control if we want to fly with the
mouse, or to follow a path
addMouseEvent(ea);
if (calcMovement()) us.requestRedraw();
} else { //we follow a path
osg::Matrixd rotation_matrix;
rotation_matrix.makeRotate(_rotation);
osg::Vec3 up = osg::Vec3(0.0f,1.0f,0.0) * rotation_matrix;
osg::Vec3 vx = osg::Vec3(1.0f,0.0f,0.0) * rotation_matrix;
osg::Vec3 lv = osg::Vec3(0.0f,.0f,-1.0f) * rotation_matrix;
osg::Vec3 sv = vx;
sv.normalize();
_velocity*=-1.0f;
pitch = inDegrees(22.5f);
osg::Quat pitch_rotate;
pitch_rotate.makeRotate(pitch,osg::X_AXIS);
_rotation = _rotation*pitch_rotate;
//////// doing that i can rotate the camera to look 22.5 degrees up, but not to
face to look at a point
lv *= (_velocity);
_eye += lv; //_eye is the actual position of the camera
us.requestRedraw();
rotationMatrix.makeRotate(_rotation);
rotationMatrix.makeLookAt(_eye, osg::Vec3(0.0,1.0, 0.0),-osg::Z_AXIS); //It
should make the camera look at (0,1,0)
_rotation = rotationMatrix.getRotate();
us.requestRedraw();
}
return true;
.....
As i said, i think i can make the camera to move from a point to another, but
not sure how to make the camera to face that point, any help or comments will
be very helpful.
Thanks in advance.
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