menu.data2

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

   commands. This will save time.
  DLV: display a single CAD IGES level. 
   All other surfaces are removed from the picture.
   All defined surfaces resulting from a CAD IGES surface
   and 3D curves resulting from a CAD IGES curve,
   defined within the specified
   level, are made active for the picture.
  DLVS: display a set of CAD IGES levels. 
   All other surfaces are removed from the picture.
   All defined surfaces resulting from a CAD IGES surface
   and 3D curves resulting from a CAD IGES curve,
   defined within one of the specified levels, are made active 
   for the picture.
  ALV: add a numbered CAD level to the picture. 
   All defined surfaces resulting from a
   CAD IGES surface and 3D curves resulting from a CAD IGES curve,
   defined within the specified
   level, are made active for the picture.
  RLV: remove a numbered CAD IGES level from the picture. 
   All defined surfaces resulting from a
   CAD IGES surface and 3D curves resulting from a CAD IGES curve,
   defined within the specified
   level, are removed from the picture.
  DGRP: display a single CAD IGES associativity group. 
   All other surfaces and curves are removed from the picture.
   All defined surfaces resulting from a CAD IGES surface
   and 3D curves resulting from a CAD IGES curve,
   listed in an IGES associativity group, entity 402,
   are made active for the picture.
  DGRPS: display a set of CAD IGES associativity groups. 
   All other surfaces and curves are removed from the picture.
   All defined surfaces resulting from a CAD IGES surface 
   and 3D curves resulting from a CAD IGES curve,
   listed in one of the specified IGES associativity groups, entity 402,
   are made active for the picture.
  AGRP: add a numbered CAD associativity group to the picture. 
   All defined surfaces resulting from a
   CAD IGES surface and 3D curves resulting from a CAD IGES curve,
   listed in an IGES associativity group, entity 402,
   are made active for the picture.
  RGRP: remove a numbered CAD associativity group from the picture. 
   All defined surfaces resulting from a
   CAD IGES surface and 3D curves resulting from a CAD IGES curve,
   listed in an IGES associativity group, entity 402,
   are removed from the picture.
  VPSD: extract surface definitions from ascii node and polygon data files.
   The node file has one record for each node.
   The first number in the record is the unique positive 
   integer node number, followed
   by the x, y, and z-coordinates in floating point or exponential form.
   These four numbers are comma delimited.
   The polygon data has one record per polygon.
   The first field assigns a group or surface name to the polygon.
   The name is used to sort the polygons into surfaces.
   It is best to group polygons into surfaces so that there are no sharp
   bends in a surface.
   This is followed by a list of ordered node numbers to be connected
   to form the polygon.
   These node numbers refer to the nodes in the node file.
   It is assumed that each polygon is nearly planar.
   Fields in this file are space delimited.
   Each record must be no longer than 128 characters.
   There is also a limit of 30 nodes forming the polygon.
   The set of surfaces can be transformed.
  WIGES: write an IGES file from a list of surfaces. Only those
   surfaces created using the HERMITE option under the SD command
   are allowed at this time.
  WRSD: write two files to contain the coordinates and polygons to
   a polygon surface (VPSD).
  TRIMMING: Select IGES surfaces to be trimmed.
   When this is on, trimmed surfaces will be trimmed by TrueGrid and
   entities related to a trimmed surface will not be evaluated.
   When this is off, then TrueGrid will evaluate IGES surfaces the way
   they were evaluated prior to version 1.2.0.
   This is important because the surfaces will be numbered differently
   and old command files using IGES data may not work properly with
   trimming on.
   This command must be used before reading the IGES file.
   The default is "on".
  LTRIM: select the amount of workspace needed to trim surfaces.
   This command is usually not needed. The default is 2000000.
   Increase the size only if the code makes that suggestion.
2D CURVE include the following commands:
  LD: begin the definition of a 2D curve in a plane.
   The local 2D coordinate system axis used to define these 2D curves 
   are labeled x for the ordinate and z for the abscissa.
   This local coordinate system should not be associated with the
   x and z axis of the global 3D coordinate system.
   Check the definition of a specific command using a 2D curve to know how
   the local 2D curve is embedded in the global 3D coordinate system.
   The LD command has many options which can be combined in almost any order to
   produce a complex 2D curve.
   This method is fashioned after the way a draftsman might
   draw a complex 2D curve.
   Each use of an option from the list below appends 
   a 2D curve segment to the composite 2D curve.
   For additional segments, use the APLD dialogue or
   issue any of the options below.
   Once a 2D curve is begun using the LD command, additional curve segments
   can no longer be added to any of the other previously defined 2D curves.
   If a previously defined 2D curve must be modified, it must be re-defined.
   To view the 2D curves, use the LV, LVS and LVI commands.
   2D curves can be used to form 3D surfaces and 3D curves.
   A 2D curve can be rotated about any axis of symmetry
   using the SD command with the CRX, CRY, CRZ, and CR options.
   A 2D curve can be extruded indefinitely in any direction
   using the SD command with the CP option.
   A 2D curve can be combined with another 2D curve to produce a ruled
   surface between the two curves in 3D
   using the SD command with the RULE2D option.
   A 2D curve can be converted to a 3D curve using the CURD command with the
   LD2D3D option.
   The following is a list of the options.
   Note that some of the options cannot be the first option in the
   2D curve definition.
    LP2 to append a list of points in coordinate pairs.
    LPIL to append to the end of the current 2D curve the point of
     intersection of two previously defined 2D curves. The coordinates of this
     point are also written to the screen.
    LPTA to append a 2D curve segment which extends and is tangent to a circle.
     This command requires that the current 2D curve definition already includes
     at least 1 point. The first two parameters are the center of the circle.
     The absolute value of the third parameter is the radius of the circle.
     There are two points on the circle that can be used to form
     a tangent line segment.
     To select the appropriate end point for the tangent line segment,
     first locate the point on the circle which is closest to the last
     point in the current 2D curve.
     If the third parameter is negative, then the end point is chosen by
     rotating around the circle clockwise to the first point of tangency.
     If the third parameter is positive, then the rotation is counterclockwise.
    LQ to append a list of points in two lists.
     The first list of numbers are the first coordinates of the 
     coordinate pairs.
     The second list of numbers are the second coordinates of the 
     coordinate pairs.
     If one list is shorter than the other, it is extended.
    LTAS to append an arc of the a circle followed by a line segment
     which is tangent to 2 circles. This command requires that 
     the current 2D curve already includes at least 1 point.
     The sum of the two radii must be smaller than the distance between
     the two centers of the two circles.
     When the two circles do not intersect, then there are 4 distinct
     cases that are distinguishable through the proper use of the
     parameters. Otherwise, there are only two cases.
     The first two parameters form the center of the first circle.
     The radius of this first circle is determined from the distance between
     the last point in the current 2D curve to the specified center of the
     circle.  If the third parameter is a -1, then the direction of rotation
     about the first circle is clockwise, otherwise it is counterclockwise.
     The next two numbers form the center of the second circle.
     The absolute value of the last number is the radius of the second circle.
     The point selected from the second circle to end the tangent line segment
     is determined by first intersecting the second circle with the line
     segment connecting the centers of the two circles.
     If the last parameter is negative, then start at this point and rotate
     about the second circle in a clockwise direction to the closest point
     of tangency.
     If the last parameter is positive, than rotate about the second
     circle in a counterclockwise direction to the closest point of tangency.
    LEP to append an elliptic arc. The first two parameters are the lengths of
     the two axes. The next two parameters are the center of the ellipse. This
     is followed by the beginning and ending angles of the arc measured
     counterclockwise from the first axis of the ellipse.
     The last parameter is the
     angle the first axis of the ellipse forms with the x-axis of the plane.
    LO to append a 2D curve which is formed by a variable offset from another
     2D curve. The variable offset is specified by selecting the start and
     end points.
     The original curve is temporarily extended at its end points so that these
     two points can be normally projected to determine their offset distance
     from this original curve.
     The variable offset to the new curve is then linearly interpolated
     by arc length.
     The resulting offset curve has the two points as end points.
     The offset calculation is done using the central difference method.
    LOD to append a 2D curve segment constructed by normally offsetting
     a previously defined 2D curve.
     The offset calculation is done using the central difference method.
     If the original curve has an end point on the z-axis, then the new
     offset curve will be given an end point on the z-axis as well.
     This done because it is assumed that these curves will then used to
     form 3D surfaces by rotation about this axis.
    LNOF to append an offset of a previously defined 2D curve where the 
     direction of the offset vector is the average of the normal vectors at 
     the end points of the previously defined 2D curve.
    LFIL to make a fillet from 2 points and 2 angles. This command requires
     that the current 2D curve definition already includes at least 1 point. An 
     arc of a circle is appended which passes through two points such that the 
     two tangents touching the circle at these two points have the specified 
     angles.
    LAP to append a circular arc through 2 points of a circle with a specified
     center. This command requires that the current 2D curve definition already
     includes at least 1 point.
    LAR to append a circular arc through 2 points of a circle with a specified
     radius. If the radius is positive, then the arc is formed by a positive
     rotation about the circle. Otherwise the arc is formed by a
     negative rotation about the circle. The current 2D curve definition must
     include at least 1 point.
    LTP to append an arc of a circle which is tangent to the endpoint of the
     current defined 2D curve. The current 2D curve definition must include at
     least
     2 points to use this command. The circle will pass through a specified
     point, forming the endpoint of the arc. The last parameter is the radius
     of the circle.
    LPT to append an arc of a circle with a specified radius and a tangent line
     segment. This command requires that the current 2D curve definition already
     includes at least 1 point. The circular arc will start at the last defined
     point in the 2D curve definition and rotate about the circle to meet the 
     tangent 2D curve segment. Two sets of coordinates are required to define 
     the slope of the tangent line. The tangent line segment will end at the 
     second point.
    LAT to append or truncate the last 2D curve segment in the current defined 
     2D curve to meet an arc of a circle with a specified radius. This command 
     requires that the current 2D curve definition already includes at least 2 
     points. A
     second line is defined by two points. The circle is constructed to be
     tangent to both lines. The arc of the circle between the two tangencies
     and the second line segment up to the second point are appended to the
     definition.
    LAD to append an arc of a circle with a specified radius, starting at the
     last point in the 2D curve definition and rotating counterclockwise about 
     the
     circle a specified amount. This command requires that the current 2D curve
     definition already includes at least 1 point.
    LVC to append a point as an offset from the previous point in the defined
     2D curve. This command requires that the current 2D curve definition
     already includes at least 1 point. The offset is specified in polar
     coordinates.
    LSTL to append a translation of a previously defined 2D curve to the
     2D curve currently being constructed.
    LTBC to append points in polar coordinates with equal angular spacing.
    CTBC to append a cubic spline with control points in polar coordinates with
     equal angular spacing.
     The curve is interpolated in polar coordinates.
     The syntax for this command is similar to the LTBC command so that it is
     easy to switch from a polygonal line to a polar cubic spline.
    FTBC to append a Fowler-Wilson cubic spline with control points in polar
     coordinates with equal angular spacing.
     The curve is interpolated in polar coordinates.
     The syntax for this command is similar to the LTBC command so that it is
     easy to switch from a polygonal line to a polar Fowler-Wilson cubic
     spline.
    LTBO to append points by modifying the radii formed from previous
     LTBC, CTBC, FTBC, LTBO, CTBO, or FTBO commands.
    CTBO to append a cubic spline by modifying the radii of the control points
     formed from previous LTBC, CTBC, FTBC, LTBO, CTBO, or FTBO commands.
    FTBO to append a Fowler-Wilson cubic spline by modifying the radii
     of the control points formed from previous LTBC, CTBC, FTBC, LTBO,
     CTBO, or FTBO commands.
    LTBOS to scale radii in any LTBO or CTBO commands that follow this command.
    LINT to append the interpolation of a 2D curve between two other
     previously defined 2D curves. Each corresponding pair of points in
     the two defined 2D curves are averaged using a weight factor. The
     specified weight factor is used for the first point and 1 minus the
     specified weight factor for the second point. The result is a set of
     points, the minimum of the number of points from the two previously defined
     2D curves.
    2DFUNC to append a parameterized function curve with a specified domain.
    CSP2 to append a cubic spline
    FWS2 to append a Fowler-Wilson cubic spline
    RSEG to read the next segment of a 2D curve definition in the edge file and
     append it to the current 2D curve. Use the EDGEFILE command to specify the
     file with the 2D curve data.
  APLD: append to the end of the last defined 2D curve started
   with the LD command.
   This command is useful only when using the menus and dialogue boxes,
   otherwise it performs no function.
    LP2 to append a list of points in coordinate pairs.
    LPIL to append to the end of the current 2D curve the point of
     intersection of two previously defined 2D curves. The coordinates of this
     point are also written to the screen.
    LPTA to append a 2D curve segment which extends and is tangent to a circle.
     This command requires that the current 2D curve definition already includes
     at least 1 point. The first two parameters are the center of the circle.
     The absolute value of the third parameter is the radius of the circle.
     There are two points on the circle that can be used to form
     a tangent line segment.
     To select the appropriate end point for the tangent line segment,
     first locate the point on the circle which is closest to the last
     point in the current 2D curve.
     If the third parameter is negative, then the end point is chosen by
     rotating around the circle clockwise to the first point of tangency.
     If the third parameter is positive, then the rotation is counterclockwise.
    LQ to append a list of points in two lists.
     The first list of numbers are the first coordinates of the 
     coordinate pairs.
     The second list of numbers are the second coordinates of the 
     coordinate pairs.
     If one list is shorter than the other, it is extended.
    LTAS to append an arc of the a circle followed by a line segment
     which is tangent to 2 circles. This command requires that 
     the current 2D curve already includes at least 1 point.
     The sum of the two radii must be smaller than the distance between
     the two centers of the two circles.
     When the two circles do not intersect, then there are 4 distinct
     cases that are distinguishable through the proper use of the
     parameters. Otherwise, there are only two cases.
     The first two parameters form the center of the first circle.
     The radius of this first circle is determined from the distance between
     the last point in the current 2D curve to the specified center of the
     circle.