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1 - a few sketches of your choosing provide control over the main surfaces of a design.
- Sketch(es) > Control Polygon
- Control Polygon > Cubic Curve
- 3 or 4 Control Polygons > Control Grid
- Control Grid > Cubic Surface
The model above uses 13 sketches to completely define the surfaces. (there are additional 'helper' sketches which are needed to build the model, but not to edit it)
2 - subdivide the main surfaces and blend the corners
- Cubic Curve > Points On Curve > Curve Segment Control Polygon
- Various methods blend Control Polygons and Control Grids Segments
The model above shows the blending of a corner where three surfaces meet. A large 'radius' blends the top to the front surface, but the top-to-left and left-to-front surfaces have a small blend 'radius'. This model is G2 smooth or better along 95% of its seams (by seam length, approximately).