Three-dimension electronic chart display information system (ECDIS) is one of the new developing directions of electronic navigation chart, and its real-time quality is one of the important requirements. In this paper...Three-dimension electronic chart display information system (ECDIS) is one of the new developing directions of electronic navigation chart, and its real-time quality is one of the important requirements. In this paper the algorithm of simplifying triangle surface using edge contraction, which can ensure the real-time display of objects in seabed enviromnent, was put forward. The optimum contraction point was determined by the Lagrange matrix, so that the algorithm ensures that the contraction point locates on the original model, meanwhile meets the demands of least deviation. This algorithm can improve the plotting speed, and preserve the boundary character by using the fewer triangles to simulate objects.展开更多
A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based...A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based on a metric derived from curvature or from a user–specified spacing,are employed as the remeshing criterion.It is assumed that the geometry is input in the form of composite parametric surfaces,with Ferguson or Nurbs type multiple patch representation.Examples involving typical aircraft geometries and a ship model,are included to demonstrate how high quality meshes can be efficiently generated on surfaces with a high degree of geometric complexity.展开更多
文摘Three-dimension electronic chart display information system (ECDIS) is one of the new developing directions of electronic navigation chart, and its real-time quality is one of the important requirements. In this paper the algorithm of simplifying triangle surface using edge contraction, which can ensure the real-time display of objects in seabed enviromnent, was put forward. The optimum contraction point was determined by the Lagrange matrix, so that the algorithm ensures that the contraction point locates on the original model, meanwhile meets the demands of least deviation. This algorithm can improve the plotting speed, and preserve the boundary character by using the fewer triangles to simulate objects.
文摘A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based on a metric derived from curvature or from a user–specified spacing,are employed as the remeshing criterion.It is assumed that the geometry is input in the form of composite parametric surfaces,with Ferguson or Nurbs type multiple patch representation.Examples involving typical aircraft geometries and a ship model,are included to demonstrate how high quality meshes can be efficiently generated on surfaces with a high degree of geometric complexity.
