Nodal connectivity of elements

The following images show order of nodes in correctly defined elements.

Edge (segment): linear and quadratic

Triangle: linear, quadratic and bi-quadratic

Quadrangle: linear, quadratic and bi-quadratic

Polygon: linear and quadratic

Tetrahedron: linear and quadratic

Hexahedron: linear, quadratic and tri-quadratic

Pentahedron: linear and quadratic

Pyramid: linear and quadratic

Hexagonal prism

Polyhedron is defined by a sequence of nodes defining all facets a sequence of number of nodes per facet Nodes: Node1_of_Facet1, Node2_of_Facet1, …, NodeN_of_Facet1, Node1_of_Facet2, Node2_of_Facet2, …, NodeN_of_Facet2, Node1_of_FacetM, Node2_of_FacetM, …, NodeN_of_FacetM Quantity of nodes per facet: NbNodes_in_Facet1, NbNodes_in_Facet2, …, NbNodes_in_FacetM For example the polyhedron shown in the image below is defined by nodes [ 1,2,3, 1,4,5,2, 2,5,6,3, 3,6,4,1, 4,7,9,5, 5,9,8,6, 6,8,7,4, 7,8,9 ] and quantities [ 3, 4, 4, 4, 4, 4, 4, 3 ] Order of nodes of a facet must assure outward direction of its normal.