Trim Surface With A Curve

Hey Don,

Thanks for taking notice. Basically I am working on a project to read STEP files to three.js. I am able to render almost all surface type except NURBS surfaces. The STEP file defines the NURBS surface but seperately defines edge bounds to the surface. I am trying to find an adequate way to display a NURBS surface that is trimmed according to edge curves/bounds as defined in a STEP file. If you see the graphics of my last response in this thread: How To Make Curved Surfaces, you can better understand what I am trying to say