[Plib-users] sgFrustum setting to the same as opengl

[Oliver B. <sh...@ih...>]

I have a function for setting up a view frustum  I want to know if
its getting the right values to be setup the same as the opengl one
... 
I am getting some wierd results in my landscape renderer -
If I roll around etc everything dissapears  but I cant see whats
going wrong ...

here is the setup code ...

void View::Set(float angle, float near, float far) {
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();				// Reset The Projection Matrix

    gluPerspective(angle, 640.0/480.0, near, far);	// Calculate The Aspect Ratio Of The Window
    glMatrixMode(GL_MODELVIEW);

    frustum.setFOV(angle, angle) ;
    frustum.setNearFar(near, far) ;

    GetGLError("View::Set()");
}

the code which acts wierd looks like : 
	 center=bounds.getCenter();
            sgFullXformPnt3(tform, center, land->camera->rotation);
	 tform[0]-=land->camera->position[0];
	 tform[1]-=land->camera->position[1];
	 tform[2]-=land->camera->position[2];
	
	 temp->setCenter(tform);
	 temp->setRadius(bounds.getRadius());
	
             if(!land->view->frustum.contains(temp)) return;

and the code for setting up the bouds sphere is  :

 for(a=0; a<4; a++)
   bounds.extend(&land->Vertices[Vertex[a]*3]);

Thanks a heap
Oliver Batchelor