VTK数据格式

VTK的数据格式包括：

• Data Types:
  • polygonal data (points, lines, polygons, triangle strips)
  • images and volumes (i.e., structured point datasets)
  • structured grids (e.g., finite difference grids)
  • unstructured grids (e.g, finite element meshes)
  • unstructured points
  • rectilinear grids
  • hierarchical grids (e.g., AMR)
  • generic datasets (user writes their own adaptor into arbitrary dataset)
• Cell Types:
  • vertex, poly-vertex
  • line, poly-line
  • triangle
  • triangle strip
  • pixel
  • quadrilateral
  • polygon
  • tetrahedron
  • voxel
  • hexahedron
  • wedge
  • pyramid
  • quadratic edges, triangles, quads, tetrahedra, hex, pyramids, wedges
  • generic adaptors to arbitrary cell types
• Attribute Types:
  • scalars (single valued plus grayscale, grayscale-alpha, rgb, and rgb-alpha).
  • vectors
  • 3x3 tensors
  • normals
  • texture coordinates (1-3D)
  • tables
  • trees
  • graphs
  • field data (arbitrary arrays)

这里使用vtkAppendFilter生成unstructured grid，当将其存储为STL文件时，UsevtkTriangleFilter to convert polygons to triangles.