246 lines
7.4 KiB
Python
246 lines
7.4 KiB
Python
import os
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import pandas as pd
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import numpy as np
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import vtk
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from vtk.util.numpy_support import numpy_to_vtk as np_to_vtk
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from . import Table
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from . import Environment
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from . import version
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class VTK:
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"""
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Spatial visualization (and potentially manipulation).
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High-level interface to VTK.
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"""
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def __init__(self,geom):
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"""
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Set geometry and topology.
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Parameters
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----------
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geom : subclass of vtk.vtkDataSet
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Description of geometry and topology. Valid types are vtk.vtkRectilinearGrid,
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vtk.vtkUnstructuredGrid, or vtk.vtkPolyData.
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"""
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self.geom = geom
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@staticmethod
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def from_rectilinearGrid(grid,size,origin=np.zeros(3)):
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"""
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Create VTK of type vtk.vtkRectilinearGrid.
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This is the common type for results from the grid solver.
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Parameters
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----------
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grid : numpy.ndarray of shape (3) of np.dtype = int
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Number of cells.
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size : numpy.ndarray of shape (3)
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Physical length.
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origin : numpy.ndarray of shape (3), optional
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Spatial origin.
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"""
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coordArray = [vtk.vtkDoubleArray(),vtk.vtkDoubleArray(),vtk.vtkDoubleArray()]
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for dim in [0,1,2]:
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coords = np.linspace(origin[dim],origin[dim]+size[dim],grid[dim]+1)
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coordArray[dim].SetArray(np_to_vtk(coords),grid[dim]+1,1)
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geom = vtk.vtkRectilinearGrid()
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geom.SetDimensions(*(grid+1))
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geom.SetXCoordinates(coordArray[0])
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geom.SetYCoordinates(coordArray[1])
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geom.SetZCoordinates(coordArray[2])
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return VTK(geom)
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@staticmethod
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def from_unstructuredGrid(nodes,connectivity,cell_type):
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"""
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Create VTK of type vtk.vtkUnstructuredGrid.
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This is the common type for results from FEM solvers.
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Parameters
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----------
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nodes : numpy.ndarray of shape (:,3)
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Spatial position of the nodes.
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connectivity : numpy.ndarray of np.dtype = int
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Cell connectivity (0-based), first dimension determines #Cells, second dimension determines #Nodes/Cell.
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cell_type : str
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Name of the vtk.vtkCell subclass. Tested for TRIANGLE, QUAD, and HEXAHEDRON.
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"""
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vtk_nodes = vtk.vtkPoints()
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vtk_nodes.SetData(np_to_vtk(nodes))
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cells = vtk.vtkCellArray()
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cells.SetNumberOfCells(connectivity.shape[0])
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T = np.concatenate((np.ones((connectivity.shape[0],1),dtype=np.int64)*connectivity.shape[1],
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connectivity),axis=1).ravel()
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cells.SetCells(connectivity.shape[0],np_to_vtk(T, deep=True, array_type=vtk.VTK_ID_TYPE))
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geom = vtk.vtkUnstructuredGrid()
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geom.SetPoints(vtk_nodes)
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geom.SetCells(eval('vtk.VTK_{}'.format(cell_type.split('_',1)[-1].upper())),cells)
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return VTK(geom)
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@staticmethod
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def from_polyData(points):
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"""
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Create VTK of type vtk.polyData.
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This is the common type for point-wise data.
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Parameters
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----------
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points : numpy.ndarray of shape (:,3)
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Spatial position of the points.
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"""
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vtk_points= vtk.vtkPoints()
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vtk_points.SetData(np_to_vtk(points))
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geom = vtk.vtkPolyData()
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geom.SetPoints(vtk_points)
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return VTK(geom)
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@staticmethod
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def from_file(fname,dataset_type=None):
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"""
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Create VTK from file.
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Parameters
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----------
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fname : str
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Filename for reading. Valid extensions are .vtk, .vtr, .vtu, and .vtp.
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dataset_type : str, optional
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Name of the vtk.vtkDataSet subclass when opening an .vtk file. Valid types are vtkRectilinearGrid,
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vtkUnstructuredGrid, and vtkPolyData.
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"""
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ext = os.path.splitext(fname)[1]
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if ext == '.vtk':
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reader = vtk.vtkGenericDataObjectReader()
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reader.SetFileName(fname)
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reader.Update()
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if 'rectilineargrid' in dataset_type.lower():
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geom = reader.GetRectilinearGridOutput()
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elif 'unstructuredgrid' in dataset_type.lower():
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geom = reader.GetUnstructuredGridOutput()
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elif 'polydata' in dataset_type.lower():
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geom = reader.GetPolyDataOutput()
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else:
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raise TypeError('Unknown dataset type for vtk file {}'.format(dataset_type))
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else:
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if ext == '.vtr':
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reader = vtk.vtkXMLRectilinearGridReader()
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elif ext == '.vtu':
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reader = vtk.vtkXMLUnstructuredGridReader()
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elif ext == '.vtp':
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reader = vtk.vtkXMLPolyDataReader()
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else:
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raise TypeError('Unknown file extension {}'.format(ext))
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reader.SetFileName(fname)
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reader.Update()
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geom = reader.GetOutput()
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return VTK(geom)
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# ToDo: If extension is given, check for consistency.
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def write(self,fname):
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"""
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Write to file.
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Parameters
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----------
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fname : str
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Filename for writing.
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"""
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if (isinstance(self.geom,vtk.vtkRectilinearGrid)):
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writer = vtk.vtkXMLRectilinearGridWriter()
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elif(isinstance(self.geom,vtk.vtkUnstructuredGrid)):
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writer = vtk.vtkXMLUnstructuredGridWriter()
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elif(isinstance(self.geom,vtk.vtkPolyData)):
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writer = vtk.vtkXMLPolyDataWriter()
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writer.SetFileName('{}.{}'.format(os.path.splitext(fname)[0],
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writer.GetDefaultFileExtension()))
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writer.SetCompressorTypeToZLib()
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writer.SetDataModeToBinary()
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writer.SetInputData(self.geom)
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writer.Write()
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# Check https://blog.kitware.com/ghost-and-blanking-visibility-changes/ for missing data
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# Needs support for pd.DataFrame and/or table
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def add(self,data,label=None):
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"""Add data to either cells or points."""
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N_points = self.geom.GetNumberOfPoints()
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N_cells = self.geom.GetNumberOfCells()
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if isinstance(data,np.ndarray):
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d = np_to_vtk(num_array=data.reshape(data.shape[0],-1),deep=True)
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d.SetName(label)
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if data.shape[0] == N_cells:
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self.geom.GetCellData().AddArray(d)
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elif data.shape[0] == N_points:
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self.geom.GetPointData().AddArray(d)
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elif isinstance(data,pd.DataFrame):
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pass
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elif isinstance(data,Table):
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pass
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def __repr__(self):
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"""ASCII representation of the VTK data."""
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writer = vtk.vtkDataSetWriter()
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writer.SetHeader('# DAMASK.VTK v{}'.format(version))
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writer.WriteToOutputStringOn()
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writer.SetInputData(self.geom)
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writer.Write()
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return writer.GetOutputString()
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def show(self):
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"""
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Render.
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See http://compilatrix.com/article/vtk-1 for further ideas.
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"""
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mapper = vtk.vtkDataSetMapper()
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mapper.SetInputData(self.geom)
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actor = vtk.vtkActor()
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actor.SetMapper(mapper)
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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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ren.AddActor(actor)
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ren.SetBackground(0.2,0.2,0.2)
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renWin.SetSize(Environment().screen_width,Environment().screen_height)
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iren = vtk.vtkRenderWindowInteractor()
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iren.SetRenderWindow(renWin)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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