LaGriT Supported Element Types

The following element types are recognized by LaGriT. Though underlying code supports hybrid or polygon shaped elements, they are not supported by most the commands. The command pages indicate limitations on element types as they apply. Note other mesh formats or applications may have different ordering conventions.

  • point (pnt) (also known as node or vertex)
  • line (lin)
  • triangle (tri)
  • quadrilateral (qud)
  • tetrahedron (tet)
  • pyramid (pyr)
  • prism (pri)
  • hexahedron (hex)
  • hybrid (hyb)
  • polygon (ply)

The following are the numbering conventions used by LaGriT for each element type. The 3D face ordering is such that the right-hand-normals of all facets point outward.

* red

is the face number (for 3D figures, number of front face is printed below the figure)

* blue

is the node number on the element vertices

* green

is the edge number (arrow gives edge direction)

point

Node Order Nodes for faces Edges for face
1 0 0

line

Node Order Nodes for faces Edges for face
1 2 1
2		 0

triangle

Node Order Nodes for faces Edges for face
1 2 3 2, 3
3, 1
1, 2		 3
2
1

quadrilateral

Node Order Nodes for faces Edges for face
1 2 3 4 1, 2
2, 3
3, 4
4, 1		 1
3
4
2

tetrahedron

Node Order Nodes for faces Edges for face
1 2 3 4 2 ,3, 4
1, 4, 3
1, 2, 4
1, 3, 2		 6, 5, 4
6, 2, 3
5, 3, 1
4, 1, 2

pyramid

Node Order Nodes for faces Edges for face
1 2 3 4 5 1, 4, 3, 2
1, 2, 5
2, 3, 5
3, 4, 5
4, 1, 5		 2, 6, 4, 1
1, 5, 3
4, 7, 5
6, 8, 7
2, 3, 8

prism

Node Order Nodes for faces Edges for face
1 2 3 4 5 6 1, 3, 2
4, 5, 6
1, 2, 5, 4
2, 3, 6, 5
1, 4, 6, 3		 2, 4, 1
7, 9, 8
1, 5, 7, 3
4, 6, 9, 5
3, 8, 6, 2

hexahedron

Node Order Nodes for faces Edges for face
1 2 3 4
5 6 7 8		 1, 4, 3, 2
5, 6, 7, 8
1, 2, 6, 5
2, 3, 7, 6
3, 4, 8, 7
1, 5, 8, 4		 2, 6, 4, 1
9, 11, 12, 10
1, 5, 9, 3
4, 7 , 11, 5
6, 8, 12, 7
3, 10, 8, 2

These describe ordering conventions used by LaGriT. See documentation for other conventions such as the AVS format described in command read/avs.