Czolem,
I took a brief look. There might be other issues but one thing seems suspect
to me. 720/568 in makePerspective call is computed on ints and hence is
equal to 1. I am sure its not what you are after. Replace it with 720.f/568.
Cheers,
Wojtek
--------------------------------------------------
From: "Tomek Krze" <[email protected]>
Sent: Monday, May 10, 2010 11:43 AM
To: <[email protected]>
Subject: [osg-users] Problem with projection
Hi,
I have problem draw a points correctly on image. I want to manualy doing
projection of vertex and draw on image.
I set a camera position:
Code:
osg::Matrixf l; l.makeLookAt(osg::Vec3(0, 0, 500), osg::Vec3(0,0,0),
osg::Vec3(0,1,0));
Projection matrix:
Code:
osg::Matrixf p; p.makePerspective(osg::DegreesToRadians(50.0f), 720/568,
1, 1000);
and next i compute new vertex cordinate (vertex is osg::Vec3):
Code:
vertex = vertex*l;
next i multiple new vertex cordinate by perspective matrix
Code:
vertex4 = osg::Vec4(vertex, 1);
vertex4 = vertex4*p;
vertex4.set(vertex4.x()/vertex4.w(), vertex4.y()/vertex4.w(),
vertex4.z()/vertex4.w(), vertex4.w());
Now I draw vertex to image but result is diffrent with image with i get
from 3dmax with this same camera parametr.
I think I need multiple with viewport matrix
Code:
osg::Matrixf v ;
osg::Viewport* viewport = new osg::Viewport(0,0,720,568);
v = viewport->computeWindowMatrix();
But when i do it vertex cordinate is too big.
Could someone tell what i doing wrong?
...
Thank you!
Cheers,
Tomek
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=27695#27695
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