A survey of curve and surface methods in CAGD
Computer Aided Geometric Design
Converse theorems of convexity for Bernstein polynomials over triangles
Journal of Approximation Theory
Hybrid cubic Be´zier triangle patches
Mathematical methods in computer aided geometric design II
Curves and surfaces for CAGD: a practical guide
Curves and surfaces for CAGD: a practical guide
Optimal multi-degree reduction of Bézier curves with constraints of endpoints continuity
Computer Aided Geometric Design
Multi-level partition of unity implicits
ACM SIGGRAPH 2003 Papers
Distance for degree raising and reduction of triangular Bézier surfaces
Journal of Computational and Applied Mathematics
Computer Aided Geometric Design
Connections between two-variable Bernstein and Jacobi polynomials on the triangle
Journal of Computational and Applied Mathematics
Approximate conversion of surface representations with polynomial bases
Computer Aided Geometric Design
Approximating tensor product Bézier surfaces with tangent plane continuity
Journal of Computational and Applied Mathematics
The conditions of convexity for Bernstein--Bézier surfaces over triangles
Computer Aided Geometric Design
Constrained multi-degree reduction of triangular Bézier surfaces using dual Bernstein polynomials
Journal of Computational and Applied Mathematics
Explicit G2-constrained degree reduction of Bézier curves by quadratic optimization
Journal of Computational and Applied Mathematics
Hi-index | 7.30 |
This paper derives an approximation algorithm for multi-degree reduction of a degree n triangular Bezier surface with corners continuity in the norm L"2. The new idea is to use orthonormality of triangular Jacobi polynomials and the transformation relationship between bivariate Jacobi and Bernstein polynomials. This algorithm has a very simple and explicit expression in matrix form, i.e., the reduced matrix depends only on the degrees of the surfaces before and after degree reduction. And the approximation error of this degree-reduced surface is minimum and can get a precise expression before processing of degree reduction. Combined with surface subdivision, the piecewise degree-reduced patches possess global C^0 continuity. Finally several numerical examples are presented to validate the effectiveness of this algorithm.