I wrote an extension for an application that displays a model of a vascular system of a patient. The extension allows the user to align a 2D x-ray image with a 3D mesh. The model moves independently from the projection, but when the user is satisfied with the alignment, they can lock the projection and the model together, so they move in unison. Moving and rotating the model is possible with the mouse and keyboard. For faster rendering I utilized the OpenGL application programming interface and its shader functionality. For easier development I first wrote a wrapper for OpenGL, which presents low level OpenGL concepts more understandably.