Hi
Thanks to all. I now know the problem was probably too simplistic for
anyone to waste their precious time. I was able to figure out the way to
compute the image co-ordinates from world object co-ordinates. I am writing
here the method in case some newbie like me needs it.
If the World Co-ordinate of the object Point is P, Then we can obtain the
Image co-ordinate C as :
1. C1 = P * MatView * MatProj * MatWind
2. C = C1 / C1.w()
where
MatView:- View Matrix obtained through osg::Camera::getViewMatrix()
MatProj:- Projection Matrix obtained through osg::Camera::getProjectionMatrix()
MatWind:- Window Matrix obtained through osg::Viewport::computeWindowMatrix()
Here the viewport is set to the size of the image to which the scene is
rendered through RTT.
Regards
Harash
Harash Sharma <[EMAIL PROTECTED]> wrote:
Hi All,
I want some help regarding computation of projected model co-ordinates.
The problem is like this. I have a cuboidal model (car). I have been able to
compute its bounding box -- so I know the world co-ordinates of the car bound
corners. The scene is being rendered to a texture with an image size of MxN
Pixels. I would like to calculate the image co-ordinates corresponding to the 8
bounding box corner co-ordinates. Is there any function available in OSG which
I can use to achieve this. If not, it would be very kind of you to indicate
some pointers on how to do it. I thought it would be as simple as multiplying
the model vectors by the osg::View::getCamera()->getViewMatrix() *
osg::View::getCamera()->getProjectionMatrix(), but I think I am missing
something.
Please Help. Thanks in advance.
Regards
Harash
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