Commit d380062c authored by Prabhu Ramachandran's avatar Prabhu Ramachandran
Browse files

NEW: Utility script to convert old VTK format files to the new XML format.

Only scalar, vector and tensor attributes are supported.
parent 14a8ddda
#!/usr/bin/env python
"""Utility script to convert an old VTK file format to the new VTK XML
file format (serial format). The output XML file will contain *all*
the existing scalars, vectors and tensors in the input file.
This requires VTK 4.x or above.
Created May 2003, Prabhu Ramachandran <prabhu@aero.iitm.ernet.in>
Licence: VTK License.
"""
import sys
import vtk
import os.path
import getopt
def getReaderWriter(file_name, out_dir=None):
r = vtk.vtkDataReader()
r.SetFileName(file_name)
f_base = os.path.splitext(file_name)[0]
r.Update()
reader = None
writer = None
xmlsuffix = '.xml'
map = {'StructuredPoints': '.vti', 'StructuredGrid': '.vts',
'RectilinearGrid': '.vtr', 'UnstructuredGrid': '.vtu',
'PolyData': '.vtp'}
for i in ['StructuredPoints', 'StructuredGrid', 'RectilinearGrid',
'UnstructuredGrid', 'PolyData']:
if eval('r.IsFile%s()'%i):
reader = eval('vtk.vtk%sReader()'%i)
if i == 'StructuredPoints':
writer = eval('vtk.vtkXMLImageDataWriter()')
else:
writer = eval('vtk.vtkXML%sWriter()'%i)
xmlsuffix = map[i]
break
if not reader:
return None, None
reader.SetFileName(file_name)
reader.Update()
out_file = f_base + xmlsuffix
if out_dir:
out_file = os.path.join(out_dir,
os.path.basename(f_base) + xmlsuffix)
writer.SetFileName(out_file)
return reader, writer
def _getAttr(reader, lst, attr='Scalars'):
p_a = []
c_a = []
for i in lst:
eval('reader.Set%sName(i)'%attr)
reader.Update()
o = reader.GetOutput()
pd = o.GetPointData()
cd = o.GetCellData()
s = eval('pd.Get%s()'%attr)
if s and (s not in p_a):
p_a.append(s)
s = eval('cd.Get%s()'%attr)
if s and (s not in c_a):
c_a.append(s)
return p_a, c_a
def setAllAttributes(reader):
s_name = []
v_name = []
t_name = []
for i in range(reader.GetNumberOfScalarsInFile()):
s_name.append(reader.GetScalarsNameInFile(i))
for i in range(reader.GetNumberOfVectorsInFile()):
v_name.append(reader.GetVectorsNameInFile(i))
for i in range(reader.GetNumberOfTensorsInFile()):
t_name.append(reader.GetTensorsNameInFile(i))
p_s, c_s = _getAttr(reader, s_name, 'Scalars')
p_v, c_v = _getAttr(reader, v_name, 'Vectors')
p_t, c_t = _getAttr(reader, t_name, 'Tensors')
o = reader.GetOutput()
pd = o.GetPointData()
for i in p_s + p_v + p_t:
pd.AddArray(i)
cd = o.GetCellData()
for i in c_s + c_v + c_t:
cd.AddArray(i)
return o
def usage():
msg = """usage: vtk2xml.py [options] vtk_file1 vtk_file2 ...\n
This program converts VTK's old file format to the new XML format.
The default mode is to store the data as appended (compressed and
base64 encoded). Change this behaviour with the provided options.
This code requires VTK 4.x or above to run.
options:
-h, --help Show this help message and exit.
-b, --binary Store data as binary (compressed and base64 encoded).
-a, --ascii Store data as ascii.
-n, --no-encode Do not base64 encode the data. This violates the
XML specification but makes reading and writing fast
and files smaller.
-d, --output-dir Output directory where the files should be generated.
Defaults to the same directory as the input file.
"""
return msg
def main():
options = "bahnd:"
long_opts = ['binary', 'ascii', 'help', 'no-encode', 'output-dir=']
try:
opts, args = getopt.getopt(sys.argv[1:], options, long_opts)
except getopt.error, msg:
print msg
print usage()
print '-'*70
print msg
sys.exit(1)
mode = 'p'
encode = 1
out_dir = None
for o, a in opts:
if o in ('-h', '--help'):
print usage()
sys.exit(0)
if o in ('-b', '--binary'):
mode = 'b'
if o in ('-a', '--ascii'):
mode = 'a'
if o in ('-n', '--no-encode'):
encode = 0
if o in ('-d', '--output-dir'):
out_dir = a
if not os.path.exists(out_dir):
print "Error: Directory %s does not exist!"%out_dir
sys.exit(1)
if len(args) < 1:
print "\nError: Incorrect number of arguments\n"
print usage()
sys.exit(1)
for i in args:
r, w = getReaderWriter(i, out_dir)
if not r:
print "\nError: Could not convert file: %s"%i
print "Unsupported data format!\n"
else:
o = setAllAttributes(r)
w.SetInput(o)
# set output modes
if mode == 'a':
w.SetDataModeToAscii()
elif mode == 'b':
w.SetDataModeToBinary()
else:
w.SetDataModeToAppended()
w.SetEncodeAppendedData(encode)
w.Write()
if __name__ == "__main__":
main()
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