Article | REF: H3750 V3

CAD : Geometrical modelling

Author: Yvon GARDAN

Publication date: July 10, 2020, Review date: January 13, 2021

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5. Curve and surface models

5.1 Basic models

The two most common types of models in CAD systems are :

  • Bézier curves and surfaces ;

  • B-spline curves and surfaces.

They can be declined in non-rational or rational form.

These models have properties that can be deduced from the mathematical model used. For example, you won't choose a B-spline or Bézier approach at random, depending on the type of application (although many parameters can be used to vary the influence of the control in both cases).

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Curve and surface models