Sculpting

Author:

Galyean Tinsley A.1,Hughes John F.2

Affiliation:

1. The Media Laboratory, Massachusetts Institute of Technology, Cambridge, MA

2. Department of Computer Science, Box 1910, Brown University, Providence, RI

Abstract

We present a new interactive modeling technique based on the notion of sculpting a solid material. A sculpting tool is controlled by a 3D input device and the material is represented by voxel data; the tool acts by modifying the values in the voxel array, much as a "paint" program's "paintbrush" modifies bitmap values. The voxel data is converted to a polygonal surface using a "marching-cubes" algorithm; since the modifications to the voxel data are local, we accelerate this computation by an incremental algorithm and accelerate the display by using a special data structure for determining which polygons must be redrawn in a particular screen region. We provide a variety of tools: one that cuts away material, one that adds material, a "sandpaper" tool, a "heat gun," etc. The technique provides an intuitive direct interaction, as if the user were working with clay or wax. The models created are free-form and may have complex topology; however, they are not precise, so the technique is appropriate for modeling a boulder or a tooth but not for modeling a crankshaft.

Publisher

Association for Computing Machinery (ACM)

Subject

Computer Graphics and Computer-Aided Design,General Computer Science

Reference17 articles.

1. A Generalization of Algebraic Surface Drawing

2. Interactive techniques for implicit modeling

3. Extended free-form deformation: a sculpturing tool for 3D geometric modeling

4. J. Foley A. van Dam S. Feiner and J. Hughes. Computer Graph!cs: Principles and Practice. Addison-Wesley second edition 1990. J. Foley A. van Dam S. Feiner and J. Hughes. Computer Graph!cs: Principles and Practice. Addison-Wesley second edition 1990.

5. Filtering by repeated integration

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