dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

I forgot to mention how to convert to the new mesh XML format.
Just use dolfin-convert which you can find in src/utils/convert.

Rename the file you want to convert to something with suffix .old
and then use dolfin-convert:

    dolfin-convert mesh.xml.old mesh.xml

I also added a script in src/utils/xml called convertall that converts
all meshes in a directory by calling dolfin-convert on each mesh. Make
sure to backup your meshes if something breaks.

I only made small changes to the XML format. Here's an example:

Old format:

<?xml version="1.0" encoding="UTF-8"?>

<dolfin xmlns:dolfin="http://www.phi.chalmers.se/dolfin/";>
  <mesh>
    <vertices size="9">
      <vertex name="0" x="0.000000" y="0.000000" z="0.0"/>
      <vertex name="1" x="1.000000" y="0.000000" z="0.0"/>
      <vertex name="2" x="1.000000" y="1.000000" z="0.0"/>
      <vertex name="3" x="0.000000" y="1.000000" z="0.0"/>
      <vertex name="4" x="0.500000" y="0.000000" z="0.0"/>
      <vertex name="5" x="1.000000" y="0.500000" z="0.0"/>
      <vertex name="6" x="0.500000" y="1.000000" z="0.0"/>
      <vertex name="7" x="0.000000" y="0.500000" z="0.0"/>
      <vertex name="8" x="0.500000" y="0.500000" z="0.0"/>
    </vertices>
    <cells size="8">
      <triangle name="0" n0="1" n1="8" n2="4"/>
      <triangle name="1" n0="3" n1="8" n2="6"/>
      <triangle name="2" n0="3" n1="7" n2="8"/>
      <triangle name="3" n0="1" n1="5" n2="8"/>
      <triangle name="4" n0="0" n1="4" n2="7"/>
      <triangle name="5" n0="2" n1="6" n2="5"/>
      <triangle name="6" n0="7" n1="4" n2="8"/>
      <triangle name="7" n0="5" n1="6" n2="8"/>
    </cells>
  </mesh>
</dolfin>

New format:

<?xml version="1.0" encoding="UTF-8"?>

<dolfin xmlns:dolfin="http://www.fenics.org/dolfin/";>
  <mesh dim="2" celltype="triangle">
    <vertices size="9">
      <vertex index="0" x="0.000000" y="0.000000"/>
      <vertex index="1" x="1.000000" y="0.000000"/>
      <vertex index="2" x="1.000000" y="1.000000"/>
      <vertex index="3" x="0.000000" y="1.000000"/>
      <vertex index="4" x="0.500000" y="0.000000"/>
      <vertex index="5" x="1.000000" y="0.500000"/>
      <vertex index="6" x="0.500000" y="1.000000"/>
      <vertex index="7" x="0.000000" y="0.500000"/>
      <vertex index="8" x="0.500000" y="0.500000"/>
    </vertices>
    <cells size="8">
      <triangle index="0" v0="1" v1="8" v2="4"/>
      <triangle index="1" v0="3" v1="8" v2="6"/>
      <triangle index="2" v0="3" v1="7" v2="8"/>
      <triangle index="3" v0="1" v1="5" v2="8"/>
      <triangle index="4" v0="0" v1="4" v2="7"/>
      <triangle index="5" v0="2" v1="6" v2="5"/>
      <triangle index="6" v0="7" v1="4" v2="8"/>
      <triangle index="7" v0="5" v1="6" v2="8"/>
    </cells>
  </mesh>
</dolfin>

/Anders