NURBS

How to compile:

sudo apt-get install freeglut3-dev
mkdir build
cd build
cmake ..
make

Then run with ./bin/nurbs

Controlling the NURBS surface:

The scene starts off with one 3 by 4 control polygon on the XZ plane.

Navigation: left click and drag to rotate around the origin.

Toggle between selection modes with tab: toggles between selecting a point, a row, a column, or the whole surface.

Change selected control point with ctrl+right, ctrl+left, ctrl+up, and ctrl+down

Move points in the x and z coordinates with the arrow keys. Move points in the y coordinates with PgUp and PgDown.

Add a row or column by pressing i (or shift-i) If a row is selected a row will be added in front (or behind) it. If a column is selected a column will be added.

Delete a selected row or column in a similar way. Press d and the selected row or column will be deleted.

Knots can be changed interactively:

Press k to enter knot mode for uKnots or shift-k for vKnots. Press tab to cycle between which knot will be moved (the one with the asterisk) and move the knot with left and right arrows.

Order can be changed interactively:

If a row is selected the vOrder will be changed. If a column is selected the uOrder will be changed. Press o to increase the order or shift-o to decrease the order.

Weights can be changed interactively:

Press w to increase the selected point's weight or press shift-w to decrease its weight.

History

Originally submitted on June 2, 2016 for project 4 in ECS 178 at UC Davis.