.. _smesh_migration_page:

*****************************************************
Modifing Mesh Python scripts from SALOME 6 and before
*****************************************************

In SALOME 7.2, the Python interface for Mesh has been slightly modified to offer new functionality:


Scripts generated for SALOME 6 and older versions must be adapted to work in SALOME 7.2 with full functionality.

The compatibility mode allows old scripts to work in almost all cases, but with a warning.

See also :ref:`geompy_migration_page`

**Salome initialisation must always be done as shown below**

*salome_init()* can be invoked safely several times):
::

	import salome
	salome.salome_init()

**smesh initialisation is modified.**
the old mode (from dump):
::

	import smesh, SMESH, SALOMEDS
	smesh.SetCurrentStudy(salome.myStudy)

the new mode:
::

	import SMESH, SALOMEDS
	from salome.smesh import smeshBuilder
	smesh =  smeshBuilder.New(salome.myStudy)


**Of course,** from smesh import ***is no more possible.**

You have to explicitely write **smesh.some_method()**.

**All algorithms have been transferred from the namespace **smesh** to the namespace **smeshBuilder**.**

For instance:
::

	MEFISTO_2D_1 = Mesh_1.Triangle(algo=smesh.MEFISTO,geom=Face_1)

is replaced by:
::

	MEFISTO_2D_1 = Mesh_1.Triangle(algo=smeshBuilder.MEFISTO,geom=Face_1)

StdMeshers algorithms concerned are **REGULAR, PYTHON, COMPOSITE, MEFISTO, Hexa, QUADRANGLE, RADIAL_QUAD**.

SMESH Plugins provide such algorithms as: **NETGEN, NETGEN_FULL, FULL_NETGEN, NETGEN_1D2D3D, NETGEN_1D2D, NETGEN_2D, NETGEN_3D**.

If you use DISTENE plugins, you also have **BLSURF, GHS3D, GHS3DPRL, Hexotic**.

**Some variables were available in both namespaces **smesh** and **SMESH**.

Now they are available only in namespace **SMESH****.

The dump function used only the namespace **SMESH**,
so, if your script was built with the help of the dump function, it should be already OK in this respect.

The most used variables concerned are:
	**NODE, EDGE, FACE, VOLUME, ALL.**
	**FT_xxx, geom_xxx, ADD_xxx...**

For instance:
::

	srcFaceGroup = srcMesh.GroupOnGeom( midFace0, "src faces", smesh.FACE )
	mesh.MakeGroup("Tetras",smesh.VOLUME,smesh.FT_ElemGeomType,"=",smesh.Geom_TETRA)
	filter = smesh.GetFilter(smesh.FACE, smesh.FT_AspectRatio, smesh.FT_MoreThan, 6.5)

is replaced by:
::

	srcFaceGroup = srcMesh.GroupOnGeom( midFace0, "src faces", SMESH.FACE )
	mesh.MakeGroup("Tetras",SMESH.VOLUME,SMESH.FT_ElemGeomType,"=",SMESH.Geom_TETRA)
	filter = smesh.GetFilter(SMESH.FACE, SMESH.FT_AspectRatio, SMESH.FT_MoreThan, 6.5)


**The namespace **smesh.smesh** does not exist any more, use **smesh** instead.**
For instance:
::

	Compound1 = smesh.smesh.Concatenate([Mesh_inf.GetMesh(), Mesh_sup.GetMesh()], 0, 1, 1e-05)

is replaced by:
::

	Compound1 = smesh.Concatenate([Mesh_inf.GetMesh(), Mesh_sup.GetMesh()], 0, 1, 1e-05)

**If you need to import a %SMESH Plugin explicitely, keep in mind that  they are now located in separate namespaces.**

For instance:
::

	import StdMeshers
	import NETGENPlugin
	import BLSURFPlugin
	import GHS3DPlugin
	import HexoticPLUGIN

is replaced by:
:: 

	from salome.StdMeshers import StdMeshersBuilder
	from salome.NETGENPlugin import NETGENPluginBuilder
	from salome.BLSURFPlugin import BLSURFPluginBuilder
	from salome.GHS3DPlugin import GHS3DPluginBuilder
	from salome.HexoticPLUGIN import HexoticPLUGINBuilder