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doc:user:geometry:user:contours

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doc:user:geometry:user:contours [2013/07/12 14:18] – external edit 127.0.0.1doc:user:geometry:user:contours [2016/03/30 15:23] (current) – external edit 127.0.0.1
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 +
 +====== Wires ======
  
 +===== Definition =====
 +
 +A ''Wire'' is a set of ''[[doc:user:geometry:user:courbes|Curves]]'', used for example to create a ''[[doc:user:geometry:user:faces|Side]]''. ''Wires'' can be open, closed, and even discontinuous. However, some operations, such as [[doc:user:geometry:mesh:2d|meshing]], can only be applied to specific Wires.
 +
 +{{ doc:user:doc-wire.png |}}
 +
 +The orientation of a ''Wire'' is given by the succession of its lines (see figure above). This orientation is relevant to define [[doc:user:elements:contact:rigid_matrices|contact tools]], since the material of the tool must be on the right hand side when following the list of Curves. 
 +
 +The orientation is also relevant when [[doc:user:geometry:mesh:2d|meshing]] a ''Side'', since the ''Wire'' must be defined "area to the left". If the ''Wire'' is made of only one ''Curve'', the orientation of the ''Wire'' is set to the one of this ''Curve''. If the ''Wire'' is made of two ''Curves'', the first ''Curve'' defines the ''Wire'' orientation.
 +
 +The ''Wire'' can be defined by specifying all its ''Curves'' at once, but it is always possible to add more ''Curves'' with the ''push()'' member function:
 +
 +  wire = wirset.add( Wire(number, [curve1, curve2, curve3, ...]) )
 +  wire.push(curve4)
 +  wire.push([curve5, curve6,...])
 +
 +| ''number''             | ''Wire'' user number ($\ge 1$)|
 +| ''curve1'', ''curve2'', ''curve3'', ... | List of ''[[doc:user:geometry:user:courbes]]'' |
 +
 +===== Notes about Wires and contact =====
 +
 +  * When a ''Wire'' is used as a contact tool, the succession of ''Curves'' should have a continuous normal. 
 +  * {{:doc:user:ico-advanced.png?18|Advanced}} If it is not the case, ''MultiProjWire'' (same definition syntax) can handle multiple projections when the normal is not continuous. 
 +  * For rigid-deformable contact, a ''Wire'' must be defined "area to the left", and the Wire orientation if defined by the succession of its curves.
 +  * The function ''wire.reverse()'' inverts the order of definition of the wire, which also inverts the orientation of its normal.
 +  * To understand how Metafor computes an "average out-of-plane normal" of a ''Wire'', which is sometimes used in 3D contact, read ''[[surfaces]]''.
 +
 + 

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