
				renderer.getContext().drawingBufferWidth, // full width
				renderer.getContext().drawingBufferHeight, // full top
				cssPosition.x * pixelRatio | 0, // rect x
				cssPosition.y * pixelRatio | 0, // rect y
				1, // rect width
				1, // rect height
			);
			// render the scene
			renderer.setRenderTarget( pickingTexture );
			renderer.render( scene, camera );
			renderer.setRenderTarget( null );
			// clear the view offset so rendering returns to normal
			camera.clearViewOffset();
			//read the pixel