The synthesis of cloth objects

ABSTRACT

In image synthesis, cloth objects such as clothes are most often modelled as textures mapped onto rigid surfaces. However, in order to represent such objects more realistically, their physical properties must be examined. This paper describes a method for modelling cloth material hanging in three dimensions when supported by any number of constraint points. The cloth synthesized with this model contains folds and appears more realistic than simple texture mapping. This paper also describes a method for rendering the cloth once its free-hanging shape has been determined.The computation of the surface of a free-hanging cloth is performed in two stages. The first stage approximates the shape of the surface which is interior to the constraint points, and the second stage performs a relaxation process on all points on the surface to arrive at a close approximation to its shape. The rendering of the surfaces is done using a ray-tracer which treats the surface as a mesh of line segments.

REFERENCES

• 1: Blinn, J., Computer Display of Curved Surfaces, University of Utah, Salt Lake City, December 1978.
• 2: James F. Blinn, Simulation of wrinkled surfaces, ACM SIGGRAPH Computer Graphics, v.12 n.3, p.286-292, August 1978
• 3: James F. Blinn , Martin E. Newell, Texture and reflection in computer generated images, Communications of the ACM, v.19 n.10, p.542-547, Oct. 1976 [doi>10.1145/360349.360353]
• 4: Catmull, E., A Subdivision Algorithm for Computer Display of Curved Surfaces, University of Utah, Salt Lake City, December 1974.
• 5: James D. Foley , Andries Van Dam, Fundamentals of interactive computer graphics, Addison-Wesley Longman Publishing Co., Inc., Boston, MA, 1982
• 6: Hathorne, Berkeley L., Woven Stretched and Textured Fabrics, Interscience Publishers, New York, 1964.
• 7: Hsu, M.B., "An Interactive Graphics Program For The Equilibrium Shape Determination For Tensioned Fabric Structures," Engineering Software for Microcomputers, Proceedings of the First International Conference, Venice, italy, 1984, pp. 227-237.
• 8: Irvine, I-I. M., Cable Structures, M.{.T., 1981.
• 9: James T. Kajiya, Anisotropic reflection models, ACM SIGGRAPH Computer Graphics, v.19 n.3, p.15-21, Jul. 1985
• 10: Miller, L., "Computer Graphics and the Woven Fabric Designer," Computers in the World of Textiles, Annual World Conference, Hong Kong, Sept. 1984, pp. 634-644.
• 11: Physical Methods of Investigating Textiles, Edited by R. Meredith and J.W.S. Hearle, Textile Book Publishers, Inc., New York, 1959, pp. 211-278.
• 12: David F. Rogers , Steven G. Satterfield, B-spline surfaces for ship hull design, ACM SIGGRAPH Computer Graphics, v.14 n.3, p.211-217, July 1980
• 13: Tensile Structures, Edited by Frei Otto, M.{.T. Press, Cambridge, Massachusetts, 1967.
• 14: Turner Whitted, An improved illumination model for shaded display, Communications of the ACM, v.23 n.6, p.343-349, June 1980 [doi>10.1145/358876.358882]

INDEX TERMS

Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.5 Computational Geometry and Object Modeling
          Subjects: Curve, surface, solid, and object representations
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Visible line/surface algorithms
  I.6 SIMULATION AND MODELING

General Terms:
Algorithms