Porting Curve and Surface Functions

OpenGL doesn't support equivalents to the IRIS GL functions for curves and surface patches. You'll need to rewrite your code if it includes any of the following calls:

• defbasis
• curvebasis, curveprecision, crv, crvn, rcrv, rcrvn, and curveit
• patchbasis, patchcurves, patchprecision, patch, and rpatch