Tip: Using "area_node_dataitem" to assign a node boundary in contact problems!

Dear Tochnogers,

Here is another useful tip:

Tochnog Contribution provided by Rebeca Cremona

Those of us using Tochnog to solve contact problems very early learn that i=
f he contact geometry is complicated passing on to Tochnog the set containi=
ng the contacting nodes may time consuming.

Rebecca Cremona contributed this method for assigning the node boundary. He=
re are her two examples, one for single geometry item and one for a geometr=
y set:

=85=85.
	geometry_line 1  0 0 1 -1 1 .1

	area_node_dataitem 1 =96geometry_line 1 -node_boundary

	area_node_dataitem_integer 1 -yes =

=85..

Now for a geometry set and using tochnog macro definitions:

=85.

	start_define

  		lower_edge geometry_polynomial 0

	end_define

	start_define

 	 	top_edge   geometry_line 1

	end_define

	start_define

  		all_edges  geometry_set 0

	end_define

		lower_edge  0 0 1 -1 1 .1

	top_edge    -1 1 1 1 .01 =


	all_edges -lower_edge -top_edge

	area_node_dataitem 1 -all_edges -node_boundary

	area_node_dataitem_integer 1 -yes

=85.

Enjoy!

Fernando Lorenzo =



---------------------------------------------------------------------------=
---
The Planet: dedicated and managed hosting, cloud storage, colocation
Stay online with enterprise data centers and the best network in the busine=
ss
Choose flexible plans and management services without long-term contracts
Personal 24x7 support from experience hosting pros just a phone call away.
http://p.sf.net/sfu/theplanet-com