コアAPI

コアAPI#

Kitware によって開発された Visualization Toolkit (VTK) には，PyVistaがラップする多くのメッシュデータ型があります．この章では，これらの異なるメッシュタイプと，VTKでこれらのメッシュタイプをラップして実装する方法について説明します．また，すべてのPyVistaタイプが共通のVTKフィルタ( フィルタを参照)に直接アクセスする方法についても説明します．

すべてのPyVistaメッシュは，DataSet型( データセットを参照)から継承されます．PyVistaには次のメッシュタイプがあります．

pyvista.PointSet is used to represent a set of points. This is to provide an interface for datasets that explicitly use "point" arrays to represent geometry. The pyvista.PointSet class is an extension of vtkPointSet.
pyvista.PolyData consists of any 1D or 2D geometries to construct vertices, lines, polygons, and triangles. We generally use pyvista.PolyData to construct scattered points and closed/open surfaces (non-volumetric datasets). The pyvista.PolyData class is an extension of vtkPolyData.
A pyvista.UnstructuredGrid is the most general dataset type that can hold any 1D, 2D, or 3D cell geometries. You can think of this as a 3D extension of pyvista.PolyData that allows volumetric cells to be present. It's fairly uncommon to explicitly make unstructured grids but they are often the result of different processing routines that might extract subsets of larger datasets. The pyvista.UnstructuredGrid class is an extension of vtkUnstructuredGrid.
A pyvista.StructuredGrid is a regular lattice of points aligned with internal coordinate axes such that the connectivity can be defined by a grid ordering. These are commonly made from numpy.meshgrid(). The cell types of structured grids must be 2D quads or 3D hexahedra. The pyvista.StructuredGrid class is an extension of vtkStructuredGrid.
A pyvista.RectilinearGrid defines meshes with implicit geometries along the axis directions that are rectangular and regular. The pyvista.RectilinearGrid class is an extension of vtkRectilinearGrid.
Image data, commonly referred to as uniform grids, and defined by the pyvista.ImageData class are meshes with implicit geometries where cell sizes are uniformly assigned along each axis and the spatial reference is built out from an origin point. The pyvista.ImageData class is an extension of vtkImageData.
pyvista.MultiBlock データセットは，複数のVTKデータセットを1つのアクセス可能かつ空間的に参照されるオブジェクトに保持するためのコンテナです． pyvista.MultiBlock クラスは vtkMultiBlockDataSet の拡張です．
pyvista.PartitionedDataSet datasets are composite dataset to encapsulates a dataset consisting of partitions. The pyvista.PartitionedDataSet class is an extension of vtkPartitionedDataSet.