Need help w/navigating within a scene

OpenGL OpenGL: Basic Coding
1

Any ideas why this doesn’t work? I am drawing a scene just fine and I want to be able to attach to any object in it.

First I clear the scene and apply the viewport transformation. Second I setup the projection transformation. Then I setup the viewing transformation and render my scene graph.

Problem is that it doesnt matter what the attach point coordinates are, I am always looking at the origin.

Any clues?

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Render this scene

void MScene::render()
{
glPushAttrib(GL_TRANSFORM_BIT);

// Clear the scene and apply the viewport transformation.

	glClearColor(
		m_BkgColor.red(),
		m_BkgColor.green(),
		m_BkgColor.blue(),
		m_BkgColor.alpha()
	);
	clear();

	MCamera* camera = m_CameraPtr.get(); // Get pointer to camera

	camera->applyViewportTransformation(); // Viewport transformation

// Setup the projection transformation

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	camera->applyProjectionTransformation();

// Setup the viewing transformation and render the scene

	MAttachedNavigator* navigator = m_NavigatorPtr.get(); // Get pointer to the navigator

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
		glLoadIdentity();
		navigator->setupViewingTransform(); // Viewing transformation
		ActionTree(p_SceneGraph); // Render the scene
	glPopMatrix();

// Done

glPopAttrib();

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Apply the viewport transformation for this camera.

void MCamera::applyViewportTransformation() const
{
glViewport(
viewPortXOrigin(),viewPortYOrigin(),viewPortWidth(),viewPortHeight()
);
}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Apply the viewport transformation for this camera.

void MCamera::applyProjectionTransformation() const
{
gluPerspective(fovY(),viewPort()->aspectRatio(),nearPlane(),farPlane());
}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Setup the viewing transform.

void MAttachedNavigator::setupViewingTransform()
{
MDoubleVector3D cameraPos(attachment().attachPoint());
cameraPos += m_CameraOffset;

glTranslated(0,0,-cameraPos.magnitude());
glRotated(-m_CameraRotation.x(),0,0,1);
glRotated(-m_CameraRotation.y(),1,0,0);
glRotated(-m_CameraRotation.z(),0,0,1);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Retrieve the current attachment

const MAttachable& MAttachedNavigator::attachment() const
{
return m_CurrentAttachment;
}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Retrieve the coordinates of this attachment

const MDoubleVector3D& MAttachable::attachPoint() const
{
return m_AttachPointCoordinates;
}

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