The following commands are available on the Mesh/Edge subpad.
The following sections describe the purpose and operation of each of the commands listed above.
The Mesh Edges operation (edge mesh, edge modify, edge picklink, and edge pickunlink commands) grades or meshes any or all edges in the model. When you grade an edge, GAMBIT applies the mesh node spacing specifications but does not create mesh nodes on the edge. When you mesh an edge, GAMBIT creates mesh nodes according to the specifications.
To perform a grading or meshing operation, you must specify the following parameters:
When you specify one or more edges for a grading or meshing operation, you must specify the following options:
In addition to the softlink and reverse options described above, GAMBIT allows you to specify whether or not to impose the grading parameters of the first edge specified in the Edges list on all other parameters in the list (see "Imposing FirstEdge Grading and Spacing Parameters," below).
When you specify more than one edge for a grading or meshing operation, GAMBIT allows you to create soft links between the specified edges. When you grade or mesh an edge that is softlinked to other edges, you can simultaneously apply the grading or meshing specifications to all of the edges that are softlinked to the specified edge.
When you specify two or more edges for a grading or meshing operation, you must specify the status of any soft links that involve the edges. The three softlink status options are as follows:
When you Maintain soft links, GAMBIT does not form or break any existing soft links associated with the specified edge(s).
When you Break a soft link associated with an edge, GAMBIT removes the edge from the softlink chain but does not break any other soft links in the chain. That is, any other edges that are part of the softlink chain remain softlinked to each other.
When you grade or mesh an edge that constitutes part of an existing softlink chain, GAMBIT allows you to specify whether the grading or meshing specifications apply to all edges that belong to the chain (the Pick with links option). The general rules pertaining to the Pick with links option are as follows.
When you mesh an edge using a nonuniform grading scheme, GAMBIT grades or meshes the edge relative to its sense. For example, if you mesh an edge using a First Length scheme (see below) and specify a first interval length of 2, GAMBIT locates the first mesh node at a distance of 2 units from the edge start vertex.
When you specify edges for a grading or meshing operation, GAMBIT allows you to change their respective senses by means of the Reverse command button on the Mesh Edges form. If you reverse the sense of an edge the grading of which is nonuniform, the grading or meshing scheme is also reversed. For example, if you mesh an edge using a First Length grading scheme and specify a first interval length of 2, then click Reverse to reverse the sense of the edge, GAMBIT meshes the edge such that the last mesh node is located at a distance of 2 from the edge end vertex.
If you apply the Reverse option to an edge that is part of a softlink chain and select the Pick with links option, GAMBIT reverses the sense and, therefore, the grading of all edges in the chain.
When you specify a set of edges for grading and/or meshing, you can also determine whether or not to impose the grading parameters of the first edge specified in the Edges list on all other edges in the list. To impose the firstedge grading parameters on the other specified edges, you must select the Use first edge settings option on the Mesh Edges form. By default, the Use first edge settings option is selected.
If you specify a set of edges at least one of which differs from the others with respect to its Grading parameters, the Use first edge settings option produces the following effects on the Grading section of the Mesh Edges form.
The behavior of the Spacing section is identical to that of the Grading section (see above) with respect to the Use first edge settings option.
NOTE: The Grading and Spacing sections of the Mesh Edges form behave independently of each other with respect to the Use first edge settings option. 
Specifying the Grading Scheme
GAMBIT provides the following types of edge mesh grading schemes.
NOTE: When you grade or mesh an edge that is connected to one or more edges that are already graded or meshed, GAMBIT provides the means to ensure that the new grading is similar to the existing grading(s) in the region surrounding the connecting vertex. This specification is accomplished by means of the MESH.EDGE.FLEXIBLE_GRADING default variable.

For each of the nonsymmetric grading schemes, GAMBIT positions mesh nodes along the edge such that the ratio of any two succeeding interval lengths is constant. That is,
where and are the lengths of intervals i and i+1, respectively, and R is a fixed value (see Figure 320). For any given number of intervals (n), the grading schemes differ from each other only with respect to the manner in which GAMBIT determines the value of the interval length ratio, R.
Figure 320: Edge mesh grading parameters
NOTE: When you mesh an edge, GAMBIT positions the mesh nodes based, in part, on the edge element type as currently specified on the Set Edge Element Type form (see "Set Edge Element Type," below).
The mesh node locations presented throughout this section are based on the 2node edge element type. 
For all nonsymmetric grading schemes other than the Exponent scheme, the interval length ratio, R, is a function of the following parameters:
The following table lists the formulas that GAMBIT uses to determine the interval length ratios (R) for each of the nonsymmetric grading schemes. The table also lists the pertinent input parameters and the corresponding titles of the input fields on the Mesh Edges form.
Scheme  Formula  Parameter  Field Title 
Successive Ratio  None  R  Ratio 
First Length  Length  
Last Length  Length  
First Last Ratio  Ratio  
Last First Ratio  Ratio  
Exponent  x  Ratio 
As an example of the differences between input parameters for the nonsymmetric grading schemes, consider the straight, graded edge shown in Figure 321. The edge possesses a length of 15 units (L = 15) and is to be graded such that it contains four intervals (n = 4), each of which is twice as long as the previous interval (R = 2).
Figure 321: Edge grading example
The grading parameters required by each of the nonsymmetric schemes to create the grading shown in Figure 321 are as follows.
Scheme  Ratio  Length 
Successive Ratio  2  
First Length  1  
Last Length  8  
First Last Ratio  0.125  
Last First Ratio  8  
Exponent  0.6848 
When you grade or mesh an edge using any nonsymmetric scheme other than the Last Length or Exponent schemes, GAMBIT allows you to specify whether the grading scheme is singlesided or doublesided. (NOTE: To apply an Exponent scheme to two segments of a single edge, use the Biexponent symmetric grading scheme (see below).) Doublesided grading differs from singlesided grading in that the edge is divided into two separate segments for grading purposes, and each segment is graded according to its own grading parameter. (NOTE: GAMBIT does not allow you to specify different grading schemes for each segment.)
When you specify doublesided grading, GAMBIT positions either a node or an interval at the center of grading for the edge. The form of the grading center (node or interval) depends on the total number of edge intervals (n) as follows (see Figure 322).
Figure 322: Doublesided grading—location of grading center
The location of the center node (n even) or the location and size of the center interval (n odd) is determined according to the following rules.
Figure 323: Doublesided grading schemeexample
Figure 324 and Figure 325 show the effect of specifying 7 and 8 intervals, respectively, on the grading of the edge shown in Figure 323.
Figure 324: Doublesided grading scheme, n = 7
Figure 325: Doublesided grading scheme, n = 8
The following table lists the interval lengths for the doublesided grading schemes shown in Figure 324 and Figure 325.
Interval 
Figure 324 n = 7 
Figure 325 n = 8 
1  0.44  0.37 
2  0.66  0.56 
3  0.99  0.83 
4  1.48  1.25 
5  1.48  1.25 
6  1.48  1.25 
7  1.48  1.25 
8  1.25 
Note that, if you specify seven intervals for the edge (n = 7), GAMBIT grades the edge such that the length of the center interval satisfies the grading ratios for both edge segments (see Figure 324). That is,
and
If you specify eight intervals for the edge (n = 8), GAMBIT grades the edge such that the lengths of the intervals on either side of the center node are equal (see Figure 325). That is,
and
DoubleSided Grading Input Parameters
When you grade or mesh an edge by means of a doublesided grading scheme, you must specify grading parameters for both segments of the edge. The following table lists doublesided grading input parameters as they appear on the Mesh Edges form for each of the available grading schemes. (For descriptions of the parameters, see Figure 322.)
Scheme  Parameter  Field Title 
Successive Ratio 

Ratio 1 Ratio 2 
First Length 

Length 1 Length 2 
First Last Ratio 

Ratio 1 Ratio 2 
Last First Ratio 

Ratio 1 Ratio 2 
As an example of the specification of doublesided grading input parameters, consider the examples shown in Figure 324 and Figure 325, above. The following tables list the parameters that are required to create the grading schemes shown in the figures.
Doublesided grading input parameters, Figure 324 (n = 7):
Scheme  Ratio 1  Ratio 2  Length 1  Length 2 
Successive Ratio  1.5  1  
First Length  0.44  1.48  
First Last Ratio  0.297  1  
Last First Ratio  3.36  1 
Doublesided grading input parameters, Figure 325 (n = 8):
Scheme  Ratio 1  Ratio 2  Length 1  Length 2 
Successive Ratio  1.5  1  
First Length  0.37  1.25  
First Last Ratio  0.297  1  
Last First Ratio  3.36  1 
GAMBIT provides two symmetric grading schemes for edge meshing:
The Biexponent scheme divides the edge into two segments of equal length and applies the Exponent grading scheme separately to each segment. The Exponent input parameter, x—specified by means of the Ratio field on the Mesh Edges formproduces the following grading characteristics for the Biexponent scheme.
x  Grading Characteristic 
< 0.5  Mesh nodes are densest near the center of grading and least dense near the endpoints of the edge. 
= 0.5  Mesh nodes are evenly spaced along the entire edge. 
> 0.5  Mesh nodes are densest near the endpoints of the edge and least dense near the center of grading. 
The Bell Shaped scheme grades the edge such that the mesh node density obeys a normal distribution centered at the geometric center of the edge. The userspecified input parameter for the Bell Shaped schemespecified by means of the Ratio field on the Mesh Edges formproduces grading characteristics identical to those shown above for the Biexponent scheme.
The interval length ratio, R, is a function of both the edge length, L, and the number of intervals, n (see above). GAMBIT provides three different ways to specify the number of intervals on an edge.
When you select the Interval count option, you must input the actual number of mesh intervals to be placed on the edge. GAMBIT grades or meshes the edge with enough nodes to result in the specified number of intervals. That is,
where m is the total number of mesh nodes on the edge, including the endpoints. For example, if you specify an interval count of 6 (n = 6), GAMBIT grades or meshes the edge with 7 nodes (m = 7), thereby creating 6 intervals on the edge.
When you select the Interval size option, you must input an interval length. GAMBIT uses the interval length to determine the total number of intervals on the edge according to the following equation:
where n is the number of intervals on the edge, L is the edge length, and d is the interval size (user input). If n is a noninteger, GAMBIT rounds to the nearest whole number to determine the number of intervals on the edge.
When you select the Shortest edge (%) option, you must input an interval size value expressed as a percentage of edge length. GAMBIT calculates the global interval size (d) for the current edgemeshing operation as follows:
where x is the Shortest edge (%) input value, and is the length of the shortest edge currently existing in the entire model. (NOTE: When you select the Shortest edge (%) option, GAMBIT highlights the graphics window display of the shortest edge.)
GAMBIT uses the resulting value of d to calculate the total numbers of intervals for all edges specified for the current edgemeshing operation. For example, if the shortest edge in the model is 10 units in length, and you mesh an edge that is 30 units long and specify the Shortest edge (%) option with x = 20 (%), GAMBIT calculates the number of intervals, n, on the meshed edge as follows:
Therefore, GAMBIT creates 15 intervals on the meshed edge.
GAMBIT provides the following edge meshing options:
If you select the Mesh option, GAMBIT creates mesh nodes when it applies the grading specifications listed on the Mesh Edges form. If you Apply the currently specified parameters without selecting the Mesh option, GAMBIT applies the node distribution parameters to the edge(s) but does not create mesh nodes.
If you select the Remove old mesh option, GAMBIT deletes any currently existing mesh and/or grading information from the specified edge(s).
If you select the Ignore size functions option, GAMBIT ignores any existing sizefunction specifications that would otherwise affect the edge mesh.
NOTE: If you attempt to grade or mesh an edge that serves directly as an attachment entity for an existing size function or is part of a highertopology entity that serves as an attachment entity for a size function, GAMBIT suspends the temporary display of edge mesh nodes until the background grid is generated. For example, if you attach a size function to a brickshaped volume and attempt to grade or mesh one of the volume edges before meshing the volume, GAMBIT suspends the temporary display of mesh nodes for the edge. However, if you mesh one of the other edges before attempting to grade or mesh the edge (thereby generating the background grid for the size function), GAMBIT enables the temporary display of mesh nodes for the edge.
To enable the temporary display of the mesh nodes and assign the specified grading parameters to an edge such as that described above, you must select the Ignore size functions option on the Mesh Edges form. 
To open the Mesh Edges form (see below), click the Create Mesh command button on the Mesh/Edge subpad.
The Mesh Edges form contains the following options and specifications.
Edges  specifies one or more edges to which the currently specified grading and/or meshing operations apply. 
Pick with links  specifies that all edges hardlinked or softlinked to the picked edge(s) are graded and/or meshed according to the currently specified grading scheme. 
Reverse  reverses the sense and grading of all specified edges. NOTE: If the Pick with links option is selected (see above), the Reverse command button reverses the sense of all edges selected by means of the Edges list box as well as all edges linked to those edges. 
Soft link  
Form Break Maintain 
specifies whether soft links are formed, broken, or maintained during the edge meshing process.

Use first edge settings  imposes the grading and spacing parameters of the first edge specified in the Edges list on all other edges in the list. 
Grading  
Apply  specifies that the currently displayed grading specifications are applied to all picked edges. 
Default  resets grading specifications to their default values. 
Type  
Successive Ratio First Length Last Length First Last Ratio Last First Ratio Exponent Biexponent Bell Shaped 
specifies the grading scheme (see "Specifying the Grading Scheme," above). 
Invert  converts currently specified gradingscheme lengths or ratios into their reciprocal values. For example, if you specify Successive Ratio grading with a First Ratio of 2.5, the Invert command button converts the First Ratio to 0.4. That is,

Double sided 
specifies that all specified edges are graded according to a doublesided scheme. (NOTE: This option is not available for the Last Length, Exponent, Biexponent, or Bell Shaped schemes.) 
The middle section of the Mesh Edges form contains slide bars that allow you to specify grading parameters. GAMBIT displays only those slide bars that are applicable to the currently specified grading scheme. The following subsections describe the parameters associated with the slide bars for each of the five grading types. For a detailed description of the parameters associated with each type of grading, see "Grading Scheme Input Parameters," above.
Ratio  (singlesided) specifies the ratio of successive interval lengths (R) along all specified edges. 
Ratio 1  (doublesided) specifies the ratio of successive interval lengths (R) along the segments of all specified edges nearest to their respective start vertices. 
Ratio 2  (doublesided) specifies the value of R along the segments of all specified edges nearest to their respective end vertices. 
Length  (singlesided) specifies the length of the first interval on all specified edges (). 
Length 1  (doublesided) specifies the length of the first interval on the segments of the specified edges nearest to their respective start vertices (). 
Length 2  (doublesided) specifies the length of the first interval on the segments of the edges nearest to their respective end vertices (). 
Length  specifies the length of the last interval on all specified edges ( ). 
Ratio  (singlesided) specifies the ratio of the first interval length to the last interval length on the specified edges ( ). 
Ratio 1  (doublesided) specifies the ratio of the first interval length to the last interval length on the segments of the specified edges nearest to their respective start vertices ( ). 
Ratio 2  (doublesided) specifies the ratio of the first interval length to the last interval length on the segments of the specified edges nearest to their respective end vertices ( 
Ratio  (singlesided) specifies the ratio of the last interval length to the first interval length on the specified edges (). 
Ratio 1  (doublesided) specifies the ratio of the last interval length to the first interval length on the segments of the specified edges nearest to their respective start vertices (). 
Ratio 2  (doublesided) specifies the ratio of the last interval length to the first interval length on the segments of the specified edges nearest to their respective end vertices ( ). 
Ratio  specifies the input parameter, x, that determines the ratio (R) of successive interval lengths for the Exponent grading scheme (see above). 
Ratio  specifies the input parameter, x, that determines the ratio (R) of successive interval lengths for the Biexponent grading scheme (see above). 
Ratio  specifies the input parameter, x, that determines the shape of the mesh node distribution for the Bell Shaped grading scheme. 
Spacing  
Apply  specifies that the currently displayed spacing parameters are applied to all specified edges. 
Default  resets mesh node spacing specifications to their default values. 
Interval size Interval count Shortest edge (%) 
specifies the method used to determine the total number of mesh nodes on any edge. The three available methods are as follows:

Value  specifies a numerical value associated with the method used to determine the total number of intervals on any edge. 
Options  
Mesh  specifies that the edges are to be meshed. If you do not specify the Mesh option, GAMBIT grades but does not create mesh nodes on the edges. 
Remove old mesh  specifies that any existing mesh nodes and/or elements are removed from the edges. 
Ignore size functions  specifies that GAMBIT ignores any existing sizefunction specifications that would otherwise affect the edge mesh. 
The Set Edge Element Type operation (default set command for the MESH.NODES.EDGE default variable) specifies the number of edge nodes upon which all face and volume meshes are based.
The edge element type determines the number of edge mesh nodes corresponding to face and volume elements in the model. There are two edge element type options:
Figure 326 shows the effect of edge element type on quadrilateral face mesh elements. In Figure 326(a), the edge element type is specified as 2 node, therefore, each edge mesh node constitutes one corner of a face element. In Figure 326(b), the edge element type is specified as 3 node, therefore, only two out of every three edge mesh nodes constitute corners of face elements.
Figure 326: 2 node and 3 node edge element types
When you change the edge element type specification, GAMBIT automatically changes all corresponding face and volume element types. Likewise, when you change the face or volume element types, GAMBIT automatically changes the edge element type. The following table summarizes the general correspondence between GAMBIT edge, face, and volume element types.
Edge  Face  Volume  
Nodes  Shape  Nodes  Shape  Nodes 
2 
Triangle Quadrilateral 
3 4 
Tetrahedral Hexahedral Wedge Pyramid 
4 8 6 5 
3 
Triangle Quadrilateral 
6 9 
Hexahedral Tetrahedral Wedge Pyramid 
27 10 18 13 
For a description of the face and volume element types listed above, see "Set Face Element Type" and "Set Volume Element Type," below.
To open the Set Edge Element Type form (see below), click the Set Edge Element Type command button on the Mesh/Edge subpad.
The Set Edge Element Type form contains the following options.
2 node  specifies that the mesh is based on twonode edge mesh elements. 
3 node  specifies that the mesh is based on threenode edge mesh elements. 
The Link/Unlink Edge Meshes command button allows you to perform the following operations.
Symbol  Command  Description 
Link Edge Meshes  Creates hard links between edges  
Unlink Edge Meshes  Deletes hard links between edges 
The following sections describe the procedures and specifications required to execute the operations listed above.
The Link Edge Meshes operation (edge link command) creates a hard link between edges. When you create hard links between edges in a set, GAMBIT associates the edges with each other such that any meshing or splitting operation applied to one or more of the edges is similarly applied to all edges in the set. For example, if you grade or mesh an edge that is hardlinked to another edge, GAMBIT grades or meshes both edges according to the grading scheme and parameters applied to the specified edge. Likewise, if you split an edge that is hardlinked to another edge, GAMBIT splits both edges.
NOTE: When you select an edge for the Link Edge Meshes operation, GAMBIT automatically highlights the graphic display of any edges to which the edge is currently linked. 
When you hardlink a set of edges, GAMBIT automatically creates hard links between the endpoint vertices of the edges. The vertex links are created such that the start endpoint vertices of all edges in the set are hardlinked to each other, and the end endpoint vertices of all edges in the set are hardlinked to each other.
GAMBIT does not allow you to hardlink two edges if their endpoint vertices are already linked to each other by means of an existing hard link. As an example of this restriction, consider the set of connected edges shown in Figure 327.
Figure 327: Edge hardlink restriction—example
If you create a hard link between edge.1 and edge.4 (Link 1), GAMBIT does not allow you to also create a hard link between edge.2 and edge.3 (Link 2), because vertex.1 and vertex.2 are already linked to vertex. 3 and vertex.4, respectively.
When you select an edge for hardlinking, GAMBIT allows you to reverse the orientation of the grading on the edge relative to its start and end vertices. To reverse the grading orientation of an edge, Shiftmiddleclick the edge in the graphics window when selecting it for hardlinking. (NOTE: If you reverse the grading orientation, GAMBIT does not change the sense of the edge.)
As an example of the effect of reversing the grading orientation, consider the two hardlinked edges shown in Figure 328, one of which is meshed using a successiveratio grading scheme with a first ratio of 2.
Figure 328: Linked edge meshes—effect of reverse orientation
If you do not reverse the grading orientation, the grading scheme for edge.1 is exactly duplicated on edge.2 (see Figure 328(a)). If you do reverse the grading scheme, the grading scheme on edge.2 is exactly reversed relative to that of edge.1 (see Figure 328(b)).
The Link Edge Meshes command includes a Periodic option that allows you to specify that the specified edges are periodically linked. Periodically linked edges are constrained such that they must behave identically to each other with respect to any virtual edgesplit and vertexmove operations.
As an example of the effect of periodic linking, consider the square, planar face shown in Figure 329, two edges (edge.1 and edge.3) of which are hardlinked to each other.
Figure 329: Virtual splitting of two hard linked edges
If you perform a virtual split of edge.1 at the split point shown in Figure 329(a), GAMBIT splits both edges to create the geometric entities shown in Figure 329(b). (NOTE: In this example, the hard link was created such that the grading orientations of edge.1 and edge.3 point in the same direction, therefore v_edge.5 and v_edge.7 are equal in length. If the grading orientations had opposed each other when the link was created, v_edge.8 would be equal in length to v_edge.5, and v_edge.7 would be equal in length to v_edge.6).
If you move v_vertex.5 in Figure 329 by means of the Slide Virtual Vertex command (see Section 2.2.2), the final state of v_vertex.6 depends on two factors:
Periodic link  Move with links option  Move v_vertex.6  Figure 330 
Yes  On  Yes  (a) 
Yes  Off  Yes  (a) 
No  On  Yes  (a) 
No  Off  No  (b) 
For example, if edge.1 and edge.3 are periodically linked, GAMBIT moves v_vertex.6 regardless of the state of the Move with links option. Likewise, if you specify the Move with links option, GAMBIT moves v_vertex.6 regardless of whether the link between edge.1 and edge.3 is periodic.
Figure 330: v_vertex.6 move states—Periodic and Move with links options
To open the Link Edge Meshes form (see below), click the Link command button on the Mesh/Edge subpad.
The Link Edge Meshes form contains the following specifications.
Edges  specifies the edges to be hardlinked. 
Periodic  specifies that the edges are to be periodically linked. 
The Unlink Edge Meshes operation (edge unlink command) deletes existing hard links associated with one or more edges. When you unlink an edge, GAMBIT deletes the link(s) between the specified edge and the edge to which it is hardlinked.
NOTE: When you select an edge for the Unlink Edge Meshes operation, GAMBIT automatically highlights the graphic display of any edges to which the edge is currently linked. 
To open the Unlink Edge Meshes form (see below), click the Unlink command button on the Mesh/Edge subpad.
The Unlink Edge Meshes form contains the following specifications.
Edge  specifies the edge(s) for which the hard link is to be deleted. 
Lower topology  specifies that all vertex hard links that are associated with the specified edge are deleted along with the corresponding edge hard links. 
The Split Meshed Edge operation (edge split meshnode command) splits a real or nonreal edge at a mesh node.
When you split an edge at a mesh node, GAMBIT splits the edge into two virtual edges that share a common virtual endpoint vertex. The common vertex is located at the position of the specified node.
When you specify the edge to be split, GAMBIT displays its existing mesh in the graphics window. To specify the exact mesh node at which the edge is to be split, either pick the node in the graphics window (using the mouse) or select the mesh node by means of the Mesh Node picklist form.
To open the Split Meshed Edge form (see below), click the Split Edge command button on the Mesh/Edge subpad.
The Split Meshed Edge form contains the following specifications.
Edge  specifies the edge to be split. 
Split With  
Node  specifies the node at which the edge is to be split. 
The Summarize Edge Mesh operation (edge msummarize command) displays edge mesh information in the Transcript window and allows you to highlight specific mesh nodes and/or edge mesh elements in the graphics window. The command requires three input parameters:
To summarize edge mesh information in the Transcript window, you must specify the type of mesh components to be included in the summary. Each edge mesh includes two component types:
GAMBIT provides two methods for selecting specific components (elements or nodes) to be included in the edge mesh summary:
To pick the components in the graphics window:
NOTE: The Mesh Edge List (Multiple) and Mesh Node List (Multiple) forms do not include the Available list field that is included on most picklist forms because of the number of items that might need to be included in the list field. A fully meshed model can contain tens of thousands of edge mesh elements or nodes, each of which constitutes an Available component. If the Mesh Edge List (Multiple) or Mesh Node List (Multiple) form included an Available list field, GAMBIT would need to compile the Available list before opening the form, thereby delaying the appearance of the form on the GUI. 
When you specify any component (element or node) to be included in the edge mesh summary, GAMBIT highlights the component in the graphics window. If you select the Element labels and/or Node labels options, GAMBIT also displays the element and/or node numbers associated with the specified components (see Figure 331).
Figure 331: Edge mesh element and node numbering display
As noted above, the type of edge mesh summary information displayed in the Transcript window depends on the type of component being summarized. For example, element summaries include node connectivity information, which is not available in node summaries.
If you select the Elements option, the edge mesh summary includes the following information for each specified element.
NOTE: For edge mesh summary information, the element type is always "edge" and the number (count) of nodes associated with each element is always "2". 
For example, if you select an Elements summary for the edge and highlighted elements shown in Figure 331, above, GAMBIT displays the following information in the Transcript window.
Total nodes: 6 Total elements: 3 Element Type Count Connectivity     1 edge 2: 1 3 3 edge 2: 4 5 4 edge 2: 5 6In this case, the summary indicates that element 3 is an edge mesh element connected to nodes 4 and 5.
Total nodes: 6 Total elements: 3 Coordinate System: c_sys.1 Node x y z Owner      1 5.0000 5.0000 5.0000 vertex.4 3 5.0000 3.0000 5.0000 edge.3 4 5.0000 1.0000 5.0000 edge.3 5 5.0000 1.0000 5.0000 edge.3 6 5.0000 3.0000 5.0000 edge.3In this case, the summary indicates that node 1 is located at the position (5, 5, 5) and is associated with ("owned by") vertex.4.
To open the Summarize Edge Mesh form (see below), click the Summarize command button on the Mesh/Edge subpad.
The Summarize Edge Mesh form contains the following options and specifications.
Edge  specifies the edge for which summary information is to be displayed. 
Component  
Elements  displays summary information for specified elements. 
All Pick 
specifies whether the edge mesh summary information includes all elements or only selected elements. 
Pick  specifies the elements for which mesh summary information is to be displayed. 
Element labels  displays labels (numbers) in the graphics window for all specified elements. 
Node labels  displays labels (numbers) in the graphics window for all nodes associated with the specified elements. 
Nodes  displays summary information for specified nodes. 
All Pick 
specifies whether the edge mesh summary information includes all nodes or only selected nodes. 
Pick  specifies the nodes for which edge mesh summary information is to be displayed. 
Node labels  displays labels (numbers) in the graphics window for all specified nodes. 
The Delete Edge Meshes operation (edge delete onlymesh command) deletes the mesh (and, optionally, mesh grading information) on one or more edges.
To open the Delete Edge Meshes form (see below), click the Delete command button on the Mesh/Edge subpad.
The Delete Edge Meshes form contains the following specifications.
Edges  specifies the edge(s) from which the mesh is to be deleted. 
All Pick 

Reset to default values  resets the grading parameters associated with the specified edge(s) to their default values. 