= Orthogonal projection coordinate system 만들기 =
{{{#!vim java

	public void onSurfaceChanged(GL10 gl, int width, int height) {
		
		this.m_width = width;
		this.m_height = height;
		
		if(buffer == null) {
			
			Util.LOGD("make framebuffer");
			world = new World();
			m_cam = world.getCamera();
			
			// light mass
			world.setAmbientLight(0xff, 0xff, 0xff);
			
			// making background plane
			float[] coordinates = { // position of vertices
				0.0f, 0.0f, 0.0f,
				m_width, 0.0f, 0.0f,
				0.0f, m_height, 0.0f,
				m_width, m_height, 0.0f
			};

			float[] uvs = { // how uv mapped?
				0.0f, 0.0f, 
				1.0f, 0.0f, 
				0.0f, 1.0f, 
				1.0f, 1.0f
			};
			
			int[] indices = { // index of each coordinate
				0, 2, 1,
				1, 2, 3
			};

			// make plane
			Object3D plane = new Object3D(coordinates, uvs, indices, RMObject2D.getTextureIDByColor(Color.white));
			plane.build();
			Util.LOGD("center: " + plane.getTransformedCenter());
			world.addObject(plane);

			RMLine line = new RMLine(new Vector2f(-100, -100), new Vector2f(200, 200), 2, Color.blue);
			line.addToWorld(world);
			
			RMFillBox box = new RMFillBox(100, 100, 200, 200, Color.black);
			box.addToWorld(world);
			
			// FOV settings
			m_cam.setFOVLimits(0.1f, 2.0f);
			m_cam.setFOV(0.1f);
			
			// set up camera
			// z = (width/2) / tan(fov/2)
			m_cam.setPosition(m_width/2, m_height/2, (float) -(m_width/2/Math.tan(m_cam.getFOV()/2.0f)));
			m_cam.lookAt(plane.getTransformedCenter());
			fixCubePosition();
			
			// configuration to view far object
			Config.farPlane = Math.abs(m_cam.getPosition().z) + 1000f;
		}
		
		// make framebuffer
		if(buffer != null)
			buffer.dispose();
		buffer = new FrameBuffer(m_width, m_height, FrameBuffer.SAMPLINGMODE_NORMAL);
	}
}}}