On Approximating Contours of the Piecewise Trilinear Interpolant Using Triangular Rational-Quadratic Bézier Patches

  • Authors:
  • Bernd Hamann;Issac J. Trotts;Gerald E. Farin

  • Affiliations:
  • -;-;-

  • Venue:
  • IEEE Transactions on Visualization and Computer Graphics
  • Year:
  • 1997

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Abstract

Given a three-dimensional (3D) array of function values Fi,驴j,k on a rectilinear grid, the marching cubes (MC) method is the most common technique used for computing a surface triangulation ${\cal T}$ approximating a contour (isosurface) F(x, y, z) = T. We describe the construction of a C0-continuous surface consisting of rational-quadratic surface patches interpolating the triangles in ${\cal T}.$ We determine the Bézier control points of a single rational-quadratic surface patch based on the coordinates of the vertices of the underlying triangle and the gradients and Hessians associated with the vertices.