[osg-users] Vertex Shader problem

[Adrian Egli OpenSceneGraph (3D)]

Try with this osg file (Geo)

(1) osgviewer test.osg
(2) your app,  osgDB::readfile(test.osg)
(3) are you sure that the camera at correct position, did you reset camera ?

2008/5/26 Rahul Jain <rahulj at darshan3d.com>:

> Hi all ,
> I have a scene graph  some thing like this MatrixTransform -> Geode ->
> Geometry . In the MatrixTransform i am setting matrix to be
>  {10,  0, 0, 0,
>    0, 10, 0, 0,
>   0,  0, 10,  0
>    2,  2, 0  , 1 }
> In the geometry i have a quad with a range (0,0) - > (1,1). Basically i
> am trying to scale and translate the quad geometry. This works fine. But
> when i try to replicate the same in my vertex shader i am not able to
> see anything. I have overridden the "Geode" node computeBound function
> to set the camera accordingly. My vertex shader looks like this
> ===================================================================
> uniform mat4 matrix; ( same as the one above : passed through osg::Uniform)
> vec4 newVertexPos;
>
> void main()
> {
>    vec4 oldVertexPos = gl_Vertex;
>    vec4 newVertexPos = oldVertexPos * matrix ;
>
>    gl_Position = gl_ModelViewProjectionMatrix * newVertexPos;
> }
>
> ======================================================================
>
> Can some one tell me what am i doing wrong
> cheers
> RJ
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>



-- 
********************************************
Adrian Egli
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