e,wx,wy,wz = glu.Project(objx, objy, objz, model, proj, view)
glu.Project() transforms the specified object coordinates into window coordinates using model, proj, and view. The
result is stored in wx, wy, and wz. A return value of #GL_TRUE indicates success, a return value of #GL_FALSE indicates failure.
Please consult an OpenGL reference manual for more information.