Operation
There are two main types of sketch based modeling. In the first, the user draws a shape in the workspace using a mouse or a tablet. The system then interprets this shape as a 3D object. Users can then alter the object by cutting off or adding sections. The process of adding sections to a model is generally referred to as overdrawing. The user is never required to interact directly with the vertices or Nurbs control points.
In the second type of sketch based modeling, the user draws one or more images on paper, then scans in the images. The system then automatically converts the sketches to a 3D model.
Read more about this topic: Sketch-based Modeling
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