Sketch-based modeling with the blob tree
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Sketch-based modeling provides an intuitive and expressive interface for 3D model creation. With the Teddy [Igarashi et al. 1999] system, complex free-form 3D models could be quickly produced using a gesture interface. However, the topological modeling operations implemented in Teddy were limited by the underlying shape representation (triangle meshes). Related systems based on variational implicit surfaces [Ará ujo and Jorge. 2003] produce smoother results but cannot support complex models.
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[3] Brian Wyvill,et al. Extending the CSG Tree. Warping, Blending and Boolean Operations in an Implicit Surface Modeling System , 1999, Comput. Graph. Forum.