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convert particle output into binary VTK XML #4386

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BenWibking wants to merge 2 commits into from
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convert particle output into binary VTK XML #4386

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e958704
write binary VTP particles
BenWibking Mar 21, 2025
767d1e2
fix binary write
BenWibking Mar 21, 2025
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29 changes: 21 additions & 8 deletions Tools/Py_util/amrex_particles_to_vtp/write_pview_file.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
import numpy as np
import struct
import os

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Unused import Note

Import of 'os' is not used.

def write_paraview_file_structmesh(fname,xp,yp,ccdata,ncdata):

Expand Down Expand Up @@ -184,7 +186,7 @@
Npts=pts.shape[0]

outfile.write("<?xml version=\"1.0\"?>\n")
outfile.write("<VTKFile type=\"PolyData\" version=\"0.1\" byte_order=\"LittleEndian\">\n")
outfile.write("<VTKFile type=\"PolyData\" version=\"0.1\" byte_order=\"LittleEndian\" header_type=\"UInt64\">\n")
outfile.write("<PolyData>\n")
outfile.write("<Piece NumberOfPoints=\"%d\" NumberOfVerts=\"0\" NumberOfLines=\"0\" NumberOfStrips=\"0\" NumberOfPolys=\"0\">\n"%(Npts))

Expand All @@ -199,14 +201,25 @@
outfile.write("</PointData>\n")

outfile.write("<Points>\n")
outfile.write("<DataArray type=\"Float32\" Name=\"Points\" NumberOfComponents=\"3\" format=\"ascii\">\n")
for i in range(Npts):
outfile.write("%e\t%e\t%e\t"%(pts[i][0],pts[i][1],pts[i][2]))
outfile.write("\n</DataArray>\n")
outfile.write("</Points>\n")

outfile.write("<DataArray type=\"Float32\" Name=\"Points\" NumberOfComponents=\"3\" format=\"appended\" offset=\"0\">\n")
outfile.write("</DataArray>\n")
outfile.write("</Points>\n")
outfile.write("</Piece>\n")
outfile.write("</PolyData>\n")
outfile.write("</VTKFile>\n")

# write AppendedData in special format
# https://vtk.org/Wiki/VTK_XML_Formats#Uncompressed_Data
outfile.write("<AppendedData encoding=\"raw\">\n")
outfile.write("\t_")
outfile.close()
with open(fname, 'ab') as binfile:
arrays_to_write = [pts]
for arr in arrays_to_write:
float_arr = arr.astype(np.float32)
binfile.write(struct.pack('<L', arr.nbytes))
binfile.write(float_arr.tobytes('C'))

outfile = open(fname, 'a')

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outfile.write("\n</AppendedData>")
outfile.write("</VTKFile>\n")
outfile.close()
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