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Triangular mesh processing tool, currently very few people use this software, but it allows us to gr

      BAN24 defines the Thin Walled Plastic element 24,
      BAN33 defines the Thermal Bar element 33,
      BAN44 defines the Tapered Unsymmetrical element 44.
    DYNA3D: default cross section properties are defined within the
     material definition. To override the default material definition
     use STHI, STHI1, STHI2, TTHI, TTHI1, TTHI2, AREA, SCAREA, IXX,
     IYY, IZZ;
    LSDYNA: the following cross section options are available
     for LSDYNA beam elements:
      W-section
      C-section
      angle section
      T-section
      rectangular tubing
      Z-section
      trapezoidal section
    MARC: the following cross section options are available for MARC elements:
      MARC13 - Open Section Thin-Walled,
      MARC14 - Thin-Walled w/o Warping,
      MARC25 - Thin-Walled,
      MARC76 - Thin-Walled w/o Warping,
      MARC79 - Thin-Walled w/  Warping,
      MARC31 - Elastic Curved Pipe,
      MARC52 - Elastic,
      MARC98 - Elastic w/ Transverse Shear.
    NASTRAN:
      BNA1 which defines the Beam
      BNA2 which defines the Offset Rods with cross section
        CSTYPE 1 for elliptic
        CSTYPE 2 for symmetry about y and z
        CSTYPE 3 for symmetry about y
        CSTYPE 4 for symmetry about z
        CSTYPE 5 for symmetry about y=z=0
        CSTYPE 6 for arbitrary
      BNA3 which defines the Curved Beam
      BNA4 which defines the Elbow & Curved Pipe
      BNA5 which defines the Simple Beam (Bar)
      BNA6 which defines the Rod
      BNA7 which defines the Tube
    NIKE3D: default cross section properties are defined within the material
     definition. To override the default material definition use STHI,
     STHI1, STHI2, TTHI, TTHI1, TTHI2;
    PATRAN: use LDP;
  DELEM: delete a set of elements.
    All boundary constraints and conditions associated with these
    deleted elements are also remove from the TrueGrid internal data
    base. Any nodes used to define these elements, which are not used
    in the definition of other elements, are removed. All constraints
    and conditions associated with these deleted nodes are
    removed from the TrueGrid internal data base.
    The sorting and data rearrangement due to element deletion can be
    extensive and time consuming. For this reason, it is recommended
    that a group of elements be deleted instead of one at a time.
    This command cannot be undone. When elements are deleted, they
    cannot be retrieved.
  ETD: specify the element types to be displayed in the graphics.
  LSBSD: List the defined beam cross sections.
   They are listed by number and type. 
   Use BSINFO to get full information about a specific beam cross
   section definition.
  OFFSET: offset node and element numbers.
   The result of this command is an altering of the numbering of nodes
   and/or elements in the output for keyword driven codes.
   All other diagnostics and graphics do not reflect
   this altering of the numbered nodes and/or elements. Most keyword
   driven codes have one list of elements. In this case, only use the
   BRICKOFF option to this command to alter the element numbering.
  BSINFO: write information about the defined beam cross sections.
   The result of this command is an altering of the numbering of nodes
   and/or elements in the output for keyword driven codes.
   All other diagnostics and graphics do not reflect
   this altering of the numbered nodes and/or elements. Most keyword
   driven codes have one list of elements. In this case, only use the
   BRICKOFF option to this command to alter the element numbering.
  SIND: shell user defined integration rules.
    0 and a list of z-coordinates, weights, and (optional) material numbers or
    1 for equal spacing
BOUNDARY: set boundary and constraint conditions
  B: nodal displacement and rotation constraints.
  CFC: Boundary conditions for the CF3D output option.
   Faces of linear brick elements can be assigned one of the following
   boundary conditions.
   The faces can be selected in three ways: A face set, near a surface,
   or a list of brick elements.
   Each condition is associated with a name.
   The data for the output is then sorted by these identifiers.
    FV for fixed velocity
    FT for fixed temperature
    FSP for fixed species
    OL for an outlet
    IL for an inlet
    WALL for a wall with 0 velocity
    UFL for u-flux
    VFL for v-flux
    WFL for w-flux
    TFL for temperature flux
    SPF for species flux
    OB
  FBC: Fluent boundary condition.
  INFOL: get information of nodes with a specific load or condition.
  LB: nodal displacement and rotation constraints within
   a local coordinate system.
   Use the LSYS to define a local coordinate system.
  JD: each numbered joint created by this command assigns constraints
   to a set of nodes to be identified later using the JT command.
   A joint can have up to 16 nodes assigned to it.
   Some joint types require less and any additional nodes assigned to
   that joint will be ignored.  When a node is assigned to a numbered joint, it
   is also assigned a sequence number or local node number within
   that joint definition.
   There are two basic types of joints.
   The first basic type (SJ, RJ, CJ, PJ, UJ, and TJ) require a specific set
   of nodes where each node may play a different role in the behavior of
   the joint.
   The second basic type is an arbitrary set of nodes constraints to share
   certain degrees of freedom. The second basic type is simply multiple
   constrained nodes and can also be accomplished using the MPC command
   in the merge phase.
   Nodes are assigned to the joint definition
   using the JT command either in the part or merge phase.
   It is best to define the joint with JD before referencing it with JT.
   The REPE option makes multiple joint definitions.
   This is useful when parts containing joints are replicated.
   The JT command also allows for a joint number increment
   so that the corresponding nodes in the different copies of the part
   can each be assigned to its corresponding numbered joint.
    SJ for spherical joint
    RJ for revolute joint
    CJ for cylindrical joint
    PJ for planar joint
    UJ for universal joint
    TJ for translational joint
    PNLT for joint penalty used with SJ, RJ, CJ, PJ, UJ, and TJ
    REPE for repeated joint definitions
    SW for spotwelded nodal constraints
    DX, DY, and DZ for shared nodal displacement
    RX, RY, and RZ for shared nodal rotation
  JTINFO: write information about defined joints.
  JT: assign a node to a numbered joint defined by JD.
   Each node in a joint is assigned a node sequence number which is referred
   to as its local node number.
   Each type of joint requires a different number of nodes and the role
   a node plays in the joint depends on the joint type and the nodes
   local node number.
   The simplest example of a joint is when a set of nodes share constraints.
   In this case the ordering of the nodes are not important.
   Up to 16 nodes can be included in a shared constraint joint.
   Note that the nodal constraints available in this command apply to new
   nodes (N) and should not be confused with the shared constraint joint
   selected with the JD command.
    N to identify the joint node 
    P to create a new node by specifying its Cartesian coordinates and material
    C to create a new node by specifying its cylindrical coordinates and
     material
    S to create a new node by specifying its spherical coordinates and material
    V Cartesian coordinate offset of the created node
    DX for a displacement constraint in the x-direction for the new node
    DY for a displacement constraint in the y-direction for the new node
    DZ for a displacement constraint in the z-direction for the new node
    RX for a rotational constraint about the local x-axis for the new node
    RY for a rotational constraint about the local y-axis for the new node
    RZ for a rotational constraint about the local z-axis for the new node
  MPC: shared nodal (multiple point) constraints for a nodal set.
  RIGID: create a rigid body from a nodal set.
  LSYS: define a local coordinate system used by the LB command.
  LSYSINFO: list all of the local coordinate systems.
  NR: assign a face set as a non-reflecting boundary.
  PLANE: define a boundary plane with options.
    SYMM for symmetry plane. If the plane is not parallel to one of
     the coordinate planes, DYNA3D requires that it pass through
     the global origin.
      VECTOR to constrain nodes along the normal vector
    SYF for symmetry plane with failure
    STON for stonewall with the options
      STICK to select a friction wall
      LIMIT to bound the wall
      MOVE to give the wall motion
      PEN to specify the penalty stiffness scale factor
      DISP to specify the displacement load curve
  PLINFO: write information about defined planes.
  IL: identifies a face set as an inlet for fluid flow.
   This should not be used for the CFX4 output option.
  OL: identifies a face set as an outlet for fluid flow.
   This should not be used for the CFX4 output option.
  RML: remove specific loads or conditions on a set of nodes.
  RSL: restore specific loads or conditions on a set of nodes.
  SPW: numbered spot welds. Define its properties using SPWD.
  SPOTWELD: interactive numbered spot welds. Define its properties
   using SPWD.
  SPWD: defines the properties of a spotweld (see the SPW command)
  SPWF: Spot welds by coordinates - no nodal alignment needed. This is
   designed for LSDYNA material type 100.
   The location of spot welds can be distributed equally along a 3D curve,
   extracted from a polygon 3D curve, or specified by coordinates.
   Be sure to use the LSDYMATS command to define the spot weld material,
   type 100.
  SW: select nodes that may impact a stone wall.
   First use the PLANE command to define the stone wall.
  SYF: assign a face set to a numbered symmetry plane with failure.
   First use the PLANE command to define the symmetry plane.
  TRP: create tracer particles
CAD: import CAD/CAM geometry
  USEIGES: include the file that contains the IGES surface and 
   3D curve evaluations.
   If the same surfaces or 3D curves to be evaluated were already
   evaluated in a previous session of TrueGrid and saved using the SAVEIGES
   command, then this command will retrieve the data and save time.
   The surface and 3D curve evaluations command IGESFILE, IGESSD, IGESCD,
   NURBSD, SD or CURD must also be issued after this command to take
   advantage of the data.
  IGES: extract and evaluate all 3D curves and surfaces from an IGES file.
   TrueGrid can use 3D curves, NURBS surfaces, planes, trimmed parametric
   surfaces and surfaces other than bounded surfaces (type 143).  B-Rep solid
   model entities are not evaluated.
   Four arguments are required for this command.
   The first is the file name.
   The second is the first defined surface number to be assigned
   to the first surface in the IGES file.
   The NURBS surfaces are processed first, followed by other surfaces,
   with the planes added last to the set of defined surfaces.
   The next argument is the first defined 3D curve number to be
   assigned to the first 3D curve encountered in the IGES file.
   The last argument is the transformation to be applied to the surfaces
   and 3D curves.
   This command is the simplest way to use IGES data with the drawback that
   the evaluation of all 3D curves and surfaces may be time consuming.
   To save the evaluations for future re-use, issue the SAVEIGES command.
   The next time this IGES file is used, issue the USEIGES command first to 
   save time in the evaluation of the entities.
  IGESFILE: sort the entities from a CAD/CAM IGES file.
   The PC version of TrueGrid may have difficulty reading an IGES file created on
   a UNIX system because null characters may be included in a string.
   This problem can be solved by opening the IGES file with a text editor and
   making the proper changes.
   TrueGrid can use 3D curves, NURBS surfaces, planes, trimmed parametric
   surfaces and surfaces other than bounded surfaces (type 143).  B-Rep solid
   model entities are not evaluated.
   This command initializes an internal data base that TrueGrid uses
   when specific IGES 3D curves or surfaces are referenced, but this command
   does not evaluate the entities.
   IGES 3D curves and surfaces must be evaluated before they can be displayed in
   the
   graphics or before a region of the mesh can be placed onto the entity.
   To render a 3D curve, first use the CURD or IGESCD command to evaluate the
   3D curve.
   To render a NURBS surface, first use SD or NURBSD command to evaluate the
   surface.
   To render a plane, first use the SD or IGESPD command to evaluate the surface.
   To render another surface other than a plane or trimmed surface, use the
   SD or IGESSD command to evaluate the surface.
   The evaluation and display of IGES entities require additional commands
   because
   it is felt that the number and size of IGES entities may be overwhelming.
   This way the user can select only a subset of the entities to display or use.
   While in the part or merge phase, use the DCD, DACD, ACD, ACDS, RCD, RCDS,
   DCDS commands
   to render evaluated IGES 3D curves and use the DSD, DASD, ASD, ASDS, 
   RSD, RSDS, DSDS commands to render evaluated IGES surfaces.
   While in the part phase, use the CUR command to place an edge of the mesh
   along an evaluated 3D curve.
   Use the SF command to place a face of the mesh onto a surface.
   Evaluation of surfaces and 3D curves can be time consuming.
   The alternative is to evaluate the entities once and save the evaluations
   using the SAVEIGES command.
   Before using the same entities in another TrueGrid session, issue the
   USEIGES command.
  IGESCD: a sequence of IGES 3D curves 
   from a CAD/CAM IGES file (see IGESFILE)
   are evaluated and each 3D curve is assigned a TrueGrid 3D curve definition
   number.
   Optionally, these 3D curves can be moved within the global coordinate system.
   While in the part or merge phase, use the commands DCD, DACD, ACD, ACS, RCD,
   RCDS, and DCDS commands to select the 3D curves displayed in the graphics.
   While in the part phase, use the CUR command to place a face of the mesh
   along a numbered 3D curve.
  IGESPD: a sequence of IGES planes 
   from a CAD/CAM IGES file (see IGESFILE)
   are evaluated and each plane is assigned a TrueGrid surface definition
   number.
   Optionally, these planes can be moved within the global coordinate system.
   While in the part or merge phase, use the commands DSD, DASD, ASD, ASDS,
   RSD, RSDS, and DSDS commands to select the surfaces displayed 
   in the graphics.
   While in the part phase, use the SF command to place a face of the mesh
   onto a numbered surface.
  IGESSD: a sequence of IGES surfaces (other than planes and 
   NURBS surfaces) from a CAD/CAM IGES file (see IGESFILE)
   are evaluated and each surface is assigned a TrueGrid surface definition
   number.