PolyData

A PolyData is a surface mesh structure that can hold data arrays in points, cells or in the dataset itself.

Structure

{
  vtkClass: 'vtkPolyData',
  metadata: {
    name: 'example.vtk',
    size: 2345,
  },
  points: {
    vtkClass: 'vtkPoints',
    name: '_points',
    numberOfComponents: 3,
    size: 300,
    dataType: 'Float32Array',
    buffer: new ArrayBuffer(),
    values: new Float32Array(this.buffer),
    ranges: [
      { min: -1, max: 1, component: 0, name: 'X' },
      { min: -1, max: 1, component: 1, name: 'Y' },
      { min: -1, max: 1, component: 2, name: 'Z' },
    ],
  },
  verts: {
    vtkClass: 'vtkCellArray',
    name: '_verts',
    numberOfComponents: 1,
    size: 123,
    dataType: 'Uint32Array', // or Uint16Array
    buffer: new ArrayBuffer(),
    values: new Uint32Array(this.buffer), // Follow the CellArray Mapping [{nbPoints}, {pointIdx...}]
  },
  lines: {
    vtkClass: 'vtkCellArray',
    name: '_lines',
    numberOfComponents: 1,
    size: 0,
    dataType: 'Uint32Array', // or Uint16Array
    values: null,
  },
  polys: {
    vtkClass: 'vtkCellArray',
    name: '_lines',
    numberOfComponents: 1,
    size: 8,
    dataType: 'Uint32Array', // or Uint16Array
    values: new Uint32Array([3, 0, 1, 2, 3, 3, 4, 5]), // 2 triangles (0,1,2)+(3,4,5)
  },
  strips: {
    vtkClass: 'vtkCellArray',
    name: '_lines',
    numberOfComponents: 1,
    size: 0,
    dataType: 'Uint32Array', // or Uint16Array
    values: null,
  },
  pointData: {
    "vtkClass": "vtkDataSetAttributes",
    "activeGlobalIds": -1,
    "activeNormals": -1,
    "activePedigreeIds": -1,
    "activeScalars": 0,
    "activeTCoords": -1,
    "activeTensors": -1,
    "activeVectors": -1,
    "copyFieldFlags": [],
    "doCopyAllOff": false,
    "doCopyAllOn": true,
    "arrays": [
      {
        "data": {
          vtkClass: 'vtkDataArray',
          name: 'Temperature',
          numberOfComponents: 1,
          size: 300,
          dataType: 'Float32Array',
          buffer: new ArrayBuffer(), // Optional: Available if fetch from Network
          values: new Float32Array(this.buffer)
        }
      }
    ],
  },
  cellData: {
    "vtkClass": "vtkDataSetAttributes",
    "activeGlobalIds": -1,
    "activeNormals": -1,
    "activePedigreeIds": -1,
    "activeScalars": 0,
    "activeTCoords": -1,
    "activeTensors": -1,
    "activeVectors": -1,
    "copyFieldFlags": [],
    "doCopyAllOff": false,
    "doCopyAllOn": true,
    "arrays": [
      {
        "data": {
          type: 'vtkDataArray',
          name: 'CellId',
          numberOfComponents: 1,
          size: 132,
          dataType: 'Uint32Array',
          values: new Uint32Array(this.buffer)
        }
      }
    ]
  },
  fieldData: {
    "vtkClass": "vtkDataSetAttributes",
    "activeGlobalIds": -1,
    "activeNormals": -1,
    "activePedigreeIds": -1,
    "activeScalars": -1,
    "activeTCoords": -1,
    "activeTensors": -1,
    "activeVectors": -1,
    "copyFieldFlags": [],
    "doCopyAllOff": false,
    "doCopyAllOn": true,
    "arrays": [
      {
        "data": {
          vtkClass: 'vtkVariantArray',
          name: 'Meta',
          size: 3,
          dataType: 'JSON',
          values: ['Some string', [1, 2, 3], { ex: 'obj' }],
        }
      }
    ]
  }
}