I choose to program a surface spanning to two guidelines using additional
lines as handles to deform the resulting surface. The surface is based on
cubic splines which connect the staring and the ending slope of the respective
For the left demonstration type demo at the command line, or press the demo
There are three commands available:
which prompts the user to pick four points, the points to be connected and
the slopepoints. options are the number of points the spline is drawn in and
the amount of tension on the spline.
which prompts the user to pick to existing lines as borders of the surface
and two existing lines as handles to determine the starting and ending slope.
There are only splines in one direction.(u-direction) option are the amount
of cells in u and v irection and again the tension of the splines.
which prompts the user to pick two existing lines as borders of the surface
and then four handles one each for a side of the surface. The picking order
has to follow the above order in order to acchieve desired results