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# DMFOREST
"forest" - A DM object that encapsulates a hierarchically refined mesh.  Forests usually have a base `DM` (see `DMForestGetBaseDM()`), from which it is refined.  The refinement and partitioning of forests is considered immutable after `DMSetUp()` is called.  To adapt a mesh, one should call `DMForestTemplate()` to create a new mesh that will default to being identical to it, specify how that mesh should differ, and then calling `DMSetUp()` on the new mesh. To specify that a mesh should be refined or coarsened from the previous mesh, a label should be defined on the
previous mesh whose values indicate which cells should be refined (`DM_ADAPT_REFINE`) or coarsened (`DM_ADAPT_COARSEN`)
and how (subtypes are free to allow additional values for things like anisotropic refinement).  The label should be
given to the *new* mesh with `DMForestSetAdaptivityLabel()`.




## See Also
 `DMType`, `DM`, `DMCreate()`, `DMSetType()`, `DMForestGetBaseDM()`, `DMForestSetBaseDM()`, `DMForestTemplate()`, `DMForestSetAdaptivityLabel()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/forest/forest.c.html#DMFOREST">src/dm/impls/forest/forest.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/forest/tutorials/ex1.c.html">src/dm/impls/forest/tutorials/ex1.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/forest/forest.c)


[Index of all DMForest routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)