suitable for pointCloud and grid.

does not work for old vtk file format, use python library directly in
this case

processing/post/vtk_addData.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+from io import StringIO
+from optparse import OptionParser
+
+import damask
+
+scriptName = os.path.splitext(os.path.basename(__file__))[0]
+scriptID   = ' '.join([scriptName,damask.version])
+
+
+# --------------------------------------------------------------------
+#                                MAIN
+# --------------------------------------------------------------------
+
+parser = OptionParser(option_class=damask.extendableOption,
+                      usage='%prog options [ASCIItable(s)]',
+                      description = 'Add scalars/vectors, tensors, and/or a RGB tuples from ASCIItable '
+                                  + 'to existing VTK file (.vtr/.vtu/.vtp).',
+                      version = scriptID)
+
+parser.add_option(      '--vtk',
+                  dest = 'vtk',
+                  type = 'string', metavar = 'string',
+                  help = 'VTK file name')
+parser.add_option('-d', '--data',
+                  dest = 'data',
+                  action = 'extend', metavar = '<string LIST>',
+                  help = 'scalar/vector value(s) label(s)')
+parser.add_option('-t', '--tensor',
+                  dest = 'tensor',
+                  action = 'extend', metavar = '<string LIST>',
+                  help = 'tensor (3x3) value label(s)')
+parser.add_option('-c', '--color',
+                  dest = 'color',
+                  action = 'extend', metavar = '<string LIST>',
+                  help = 'RGB color tuple label')
+
+parser.set_defaults(data = [],
+                    tensor = [],
+                    color = [],
+)
+
+(options, filenames) = parser.parse_args()
+if filenames == []: filenames = [None]
+
+if not options.vtk:
+    parser.error('No VTK file specified.')
+
+for name in filenames:
+    damask.util.report(scriptName,name)
+  
+    table = damask.Table.from_ASCII(StringIO(''.join(sys.stdin.read())) if name is None else name)
+    vtk = damask.VTK.from_file(options.vtk)
+
+    for data in options.data+options.tensor:
+        vtk.add(table.get(data),data)
+    for color in options.color:
+        vtk.add((table.get(color)*255).astype(np.uint8),color)
+  
+    vtk.write(options.vtk)