Hi NG!
i have a GUI Viewport on top of my scene. I use a passiveBackground and
set up the camera like this:
Matrix orthogonalMatrix;
Real32 nearClip=-0.001;
Real32 farClip=1000.0;
Real32 aspect = 1024.0/1450.0;
MatrixOrthogonal(orthogonalMatrix, 0.0, 1.0, 0.0, 1.0*aspect,
nearClip, farClip);
_camera = MatrixCamera::create();
_camera->setProjectionMatrix( orthogonalMatrix);
//Now the viewport:
PassiveBackgroundPtr passiveBackground = PassiveBackground::create();
beginEditCP(_viewport);
_viewport->setCamera( _camera);
_viewport->setRoot( _orthoRoot);
_viewport->setSize( 0.0, 0.0, 1.0, 1.0);
_viewport->setBackground(passiveBackground);
endEditCP(_viewport);
That works fine and i can see everything as expected.
However now i wanted to do picking but the Ray that
camera->calcViewRay() returns does not do the job.
Its Position is always at [0,0,0], whereas the Direction is some other
value like
[0.000234 0.000235 -1.00000] the third value is always -1.0 and the
others are really small.
I had expected that the position's (x,y) would reflect my mouse click's
(x,y) and the z coordinate to be >=0;
This is how i call it:
bool OverlayViewport::mouseClick( int button, int state, int x, int y)
{
Line ray;
_camera->calcViewRay( ray, x, y );
printf("ray: [%f %f %f] to [%f %f %f]\n", ray.getPosition().x(),
ray.getPosition().y(), ray.getPosition().z(),
ray.getDirection().x(), ray.getDirection().y(),
ray.getDirection().z());
IntersectAction *iAct = IntersectAction::create(ray);
iAct->apply( _orthoRoot);
//react...
}
As I am not really sure about what is happening here, I would like to ask:
Is this the correct way to set up an orthografic camera?
Is calcViewRay the right choice for such an ortho Cam?
If Not, how do i pick my objects then?
Thanks in advance,
Tobias Kilian
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