Development Plan

Ready (for cubics):

• FreeCAD Sketcher as interface to define NURBS control polygons.
• Control Polygon Objects linked to Sketch(es)
• Cubic Curve object linked to Control Polygons
• Grid objects linked to loops of 3 or 4 Control Polygons (3 curves results in a degenerate grid)
• Surface objects linked to grid objects
• subdividing/segmenting curve and surface objects
• 2 curve corner blending with automatic G2 output
• 2 face seam blending with automatic G2 output
• methods to tune corner and seam blends (G3+ output is sometimes possible)
• method to blend the corner formed by 3 faces (includes a degenerate surface, impact can sometimes be minimized)

Needed:

• convenience: more point on curve methods (at curve intersection, surface intersection, etc)

• convenience: point on surface methods

• convenience: more segmenting methods

• modeling tool: isoline extraction

• modeling tool: crude normal offset. maintains order and pole count.

• core function: non degenerate triangle by joining of three quadrangles

• core function: 5 face blending strategy

• core function: 6 face blending strategy