Nurbs Mesh

Here is the output mesh of a nurbs model I made whilst experimenting with this technique. I built the curve network as described earlier and Bi-railed them to create the surface. In this example there are five patches joined up - a big no-no for nurbs modeling. Nurbs patches have to consist of four sides and cannot join five edges together. The way to overcome this is to perform a global stitch to bring the edges together and importantly remain tangent and smooth.

Each patch 1 through 5 were separated from each other and then systematically attached, survace rebuilt to resore parameterisation and then the history deleted. Attaching the patches creates tangency between the two but can pull it further from the opposite neighbouring patch. Next task is to detach the patch so it can be joind on the other side (deleting history inbetween). I have created two MEL buttons that will perform the attach functions with one click and the detach functions with one click - speeding up the workflow.

Once the patches have been attached/detached twice (moving in a clockwise direction) they can have the global stitch applied. As you can see from above the stitch has pulled the edges together perfectly and will convert to polygone with little issue.