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documentation/lagrit_manual/commands/recon.txt

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+.. _recon:
+
+&nbsp_place_holder;
+
+> **_RECON_**
+
+>
+
+>> This command flips connections in the mesh to get restore the Delaunay
+criterion or to improve element shapes. The option 1 (recommended for 2D
+meshes only) adds points on the boundaries if needed. The option 0 (default)
+specifies that no points are to be added on the boundaries. The standard
+method used by recon is to flip connections based on the in-sphere test (the
+circumsphere of a tetrahedral element should contain no other nodes).
+Additional flipping criteria are available. The Minimum Error Gradient
+Adaption ([mega](RADAPT.html)) can be invoked by changing the value of the
+code variable [ivoronoi](../meshobject.html) (**cmo/setatt**//ivoronoi/-2).
+The effect of this option is to generate well shaped elements; however the
+grid will not be Delaunay. If the user has a function to used for adaptive
+reconnection this option is available by setting the code variable ivoronoi to
+2 (**cmo/setatt**//ivoronoi/2). The user will have to supply an external
+function.
+
+> > If damage is specified then flips on exterior boundaries are checked to
+verify that the maximum depth of deformation of the external boundary does not
+exceed the value of damage. The default value of damage is 1% of the problem
+size. This setting prevents connecting across corners if the external boundary
+is a reflective box.
+
+>>
+
+>> If the keyword **checkaxy **is provided, then 2D flips are suppressed if
+the new triangles
+
+would have xy-projected areas less than EPSILONA.
+
+>>
+
+>> **recon** is called by other LaGriT commands such as
+**massage**.&nbsp_place_holder; To disable recon set ivoronoi to 5
+(**cmo/setatt**//ivoronoi/5).
+
+>>
+
+>> **recon** will by default reconnect across interface
+edges.&nbsp_place_holder; To restrict reconnection to interior faces and
+exterior boundary faces, set [iopt2to2](../meshobject.html) to 0
+(**cmo/setatt**//iopt2to2/0)
+
+>
+
+> FORMAT:
+
+>
+
+>> **recon**/[**1**|**0**]/[damage]/[**checkaxy**]
+
+>
+
+> EXAMPLES:
+
+>
+
+>> **recon**&nbsp_place_holder;&nbsp_place_holder; attempt to restore Delaunay
+
+>>
+
+>> **cmo/setatt**//ivoronoi/-2
+
+>>
+
+>> **recon&nbsp_place_holder;**&nbsp_place_holder;&nbsp_place_holder; attempt
+to improve geometric mesh quality
+
+>>
+
+>> **recon**/**1**&nbsp_place_holder; for 2d meshes add nodes on boundaries to
+guarantee Delaunay
+
+>>
+
+>> **recon**//.001&nbsp_place_holder; reconnect limit interface and boundary
+damage to a maximum of .001.
+
+>>
+
+>> **recon**/0/.001/**checkaxy**&nbsp_place_holder; for 2d meshes reconnect,
+limiting damage to a maximum of .001
+
+&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&n
+bsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbs
+p_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_
+place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_pl
+ace_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_plac
+e_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_
+holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_ho
+lder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_hold
+er;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder
+;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; and preventing
+creation of any negatively oriented or small triangles
+
+&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&n
+bsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbs
+p_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_
+place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_pl
+ace_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_plac
+e_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_
+holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_ho
+lder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_hold
+er;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder
+;&nbsp_place_holder;&nbsp_place_holder;&nbsp_place_holder; (with respect to
+the xy-plane).
+
+&nbsp_place_holder;
+
+&nbsp_place_holder;
+
+>
+
+> [Click here for demos](../demos/2d_recon/test/html/main_2d_recon.html)
+
+>
+
+>> &nbsp_place_holder;
+
+  
+&nbsp_place_holder;
+