== Fibers and Fields exercise ==

[[TableOfContents(3)]]

=== Description ===
 * An automated script that runs this tutorial is included in the Continuity installation: `examples\mesh11\fieldsAndFibers.py`. To run it, click [:Continuity/Documentation/Help/ReadPythonScript:File→Scripts→Read script→Python or session script]

=== Setup and render mesh ===
 * Launch the Continuity Client
 * [:Continuity/Documentation/Help/MeshEditCoordinates:Mesh→Edit→Coordinates...]
  * Select '''prolate spheriodal''' in the {{{Global Coordinates:}}} pop-up menu
  * Enter '''3.75''' next to the {{{Focus Position}}} field
  * Click '''OK''' to submit {{{Coordinate Form}}}
 * [:Continuity/Documentation/Help/MeshEditBasis:Mesh→Edit→Basis...]
  * Choose '''Hermite Basis Function→3D→Linear-Cubic-Cubic'''
  * Click '''Add Linear-Cubic-Cubic'''
  * Choose '''Lagrange Basis Function→3D→Linear-Linear-Linear'''
  * Click '''Add Linear-Linear-Linear'''
  * Verify that the list of basis functions now contains:
   * Linear-Cubic-Cubic Hermite 3*3*3
   * Linear-Cubic Hermite 3*3
   * Cubic-Cubic Hermite 3*3
   * Cubic-Linear Hermite 3*3
   * Linear-Linear-Linear Lagrange 3*3*3
   * Linear-Linear Lagrange 3*3
  * Click '''OK''' to submit {{{Basis Form}}}
 * [:Continuity/Documentation/Help/MeshEditNodes:Mesh→Edit→Nodes...]
  * Click '''Import/Export/Graph''' button to open [:Continuity/Documentation/Help/TableManager:Continuity Table Manager]
   * [:Continuity/Documentation/Help/TableManager#FileMenu:Continuity Table Manager→File→Open...]
    * Select tab-delimited nodes file ( attachment:nodes.xls )
    * [:Continuity/Documentation/Help/TableManager#FileMenu:Continuity Table Manager→File→Close and update form]
  * You should now have nodes numbered 1-8 in the list
  * In the {{{Node Form}}} under {{{Dervatives with respect to}}}, select the '''Angle Changes''' radio button
  * Select '''Linear-Cubic-Cubic''' under {{{Coordinate 1}}}, {{{Coordinate 2}}}, and {{{Coordinate 3}}}
  * Click on the {{{Fiber Angles}}} tab
  * Select '''Linear-Linear-Linear''' under {{{Fiber Angle}}}, {{{Transverse Angle}}}, and {{{Sheet Angle}}}
  * Click on the {{{Field Vector 1}}} tab
  * Select '''Linear-Linear-Linear''' under {{{Field Variable 1}}}
  * Click '''OK''' to submit {{{Node Form}}}
 * [:Continuity/Documentation/Help/MeshEditElements:Mesh→Edit→Elements...]
  * Click '''Import/Export''' button to open [:Continuity/Documentation/Help/TableManager:Continuity Table Manager]
   * [:Continuity/Documentation/Help/TableManager#FileMenu:Continuity Table Manager→File→Open...]
    * Select tab-delimited elemsents file ( attachment:elems.xls )
    * [:Continuity/Documentation/Help/TableManager#FileMenu:Continuity Table Manager→File→Close and update form]
  * You should now have 3 elements in the list
  * Click '''OK''' to submit {{{Element Form}}}
 * [:Continuity/Documentation/Help/MeshRenderNodes:Mesh→Render→Nodes...]
 * [:Continuity/Documentation/Help/MeshRenderElements:Mesh→Render→Elements...]
  * Click the '''lines''' radio button
  * Click '''Render'''
  * The mesh should now look similar to the following screenshot
attachment:mesh8-1.png
 * [:Continuity/Documentation/Help/ViewShowOpenMesh:View→Show Open Mesh...]
  * Click on '''elements lines2''' in the list on the left
  * Click on the {{{Colors}}} tab
  * Change the {{{R,G,B}}} color field to '''1.0, 0.0, 0.0''' to change the color to the brightest red and hit '''Enter'''
 * [:Continuity/Documentation/Help/MeshEditMaterialCoordinates:Mesh→Edit→Material Coordinates...]
  * Click on the {{{OK}}} Button
 * [:Continuity/Documentation/Help/FileSend:File→Send]
 * [:Continuity/Documentation/Help/MeshRenderFibers:Mesh→Render→Fibers...]
  * For the {{{Xi3 Locations}}} field, enter '''0.0,0.5,1.0'''
  * Click '''OK'''
 * [:Continuity/Documentation/Help/MeshRenderFields:Mesh→Render→Fields...]
  * Select '''3''' for {{{At Xi}}}
  * Enter '''0.0''' for the {{{Location}}} field
  * Click '''Render'''
  * The mesh shoud now look similar to the following screenshot
attachment:mesh8-2.png
 * [:Continuity/Documentation/Help/MeshRenderFields:Mesh→Render→Fields...]
  * Select '''3''' for {{{At Xi}}}
  * Enter '''1.0''' for the {{{Location}}} field
  * Click '''Render'''
  * The mesh should look similar to the following screenshort.  You can change the size of the fibers from View→Show Open Mesh→material axes→Properties tab→Scale, increase it to around 200, or as desired
attachment:mesh8-3.png

=== Pre-built model ===
This cont6 file contains all data and parameters for this problem: attachment:mesh8.cont6

[[BR]]

 . '''Warning: Render Fields does not always work correctly with the !DejaVu renderer on laptops. If this is the case, try using the !OpenMesh renderer.'''