.. _grid2grid:

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## GRID2GRID

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&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; The **grid2grid**
command converts a mesh with one element type to a mesh with another. The
conversion type is determined by the second argument.

  
  
FORMAT:

> **grid2grid **/ ioption / [cmo_sink] / [cmo_source]

  
ioption: is a character string that determines the element type of the source
and sink meshes. There is no 'default' option - this argument must be
specified.

> **quadtotri2**&nbsp_place_holder;&nbsp_place_holder; quad to 2 triangles, no
new points.

**prismtotet3**&nbsp_place_holder;&nbsp_place_holder; prism to 3 tets, no new points.   
**quattotri4**&nbsp_place_holder;&nbsp_place_holder; quad to 4 triangles, with one new point.   
**pyrtotet4**&nbsp_place_holder;&nbsp_place_holder; pyramid to 4 tets, with one new point.   
**hextotet5**&nbsp_place_holder;&nbsp_place_holder; hex to 5 tets, no new points.   
**hextotet6**&nbsp_place_holder;&nbsp_place_holder; hex to 6 tets, no new points.   
**prismtotet14**&nbsp_place_holder;&nbsp_place_holder; prism to 14 tets, four new points (1 + 3 faces).   
**prismtotet18**&nbsp_place_holder;&nbsp_place_holder; prism to 18 tets, six new points (1 + 5 faces).   
**hextotet24**&nbsp_place_holder;&nbsp_place_holder; hex to 24 tets, seven new points (1 + 6 faces).   
tree_to_fe &nbsp_place_holder; quadtree or octree grid to grid with no parent-
type elements.

  
[ cmo_snk / cmo_src ] : are the mesh_object names. cmo_src is the original
grid. cmo_snk

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&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; is the name for the
new tet or triangle grid. These may be the same grid, if so desired. If both
are left blank,

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&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; the current mesh
object will be used. If only one mesh name is given, it will be used at the
sink mesh, and the

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&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; current mesh object
will be used as the source.

  
****EXAMPLES: 

> **grid2grid / hextotet****24&nbsp_place_holder; **/&nbsp_place_holder;
cmo_tet / cmo_hex Convert each hex element in cmo_hex to 24 tets and name the
new grid cmo_tet.

**grid2grid / quadtotri4 **/&nbsp_place_holder; new_mesh No source mesh is given, so the current mesh object (which is a quad mesh) will have every quad converted into 4 triangles, and saved as new_mesh.    
**grid2grid / tree_to_fe**** **/ new_mesh /&nbsp_place_holder; octree_mesh**** Every element in octree_mesh will be scanned to see if it is a parent element. If it is, it will be removed, so only the leaf elements remain. The result will be stored in new_mesh.