SEAMCRT Version 2.0i (alpha test mode)

Author: William M. Chan

Date: October, 2000.

SEAMCRT can be used to create surface curves on triangulated reference surfaces (CART3D or FAST format). Three options are available:

 (1) Extract and concatenate sharp edges to form seam curves (IMODE=1)
 (2) Create one or more curves by intersection with specified Cartesian plane (IMODE=2)
 (3) Create curve by stencil walk between two specified vertices using existing edges
     (IMODE=3)
 (4) Create curve by stencil walk between two specified vertices using direct path
     (IMODE=4)

Input Files

    (1) Surface triangulation in CART3D or FAST format
    (2) Input parameters

Output Files

    (1) Surface curves in PLOT3D multiple grid format

Input Parameters

   IMODE = 1   Extract and concatenate sharp edges to form seam curves
           2   Create one or more curves by intersection with specified Cartesian plane
           3   Create curve by connecting given vertex pairs using existing edges
           4   Create curve on direct path between vertex pairs

 if IMODE = 1

   ISYM  = 0   surface geometry not bounded by a symmetry plane
           1   surface geometry bounded by x constant symmetry plane
           2   surface geometry bounded by y constant symmetry plane
           3   surface geometry bounded by z constant symmetry plane

 else if IMODE = 2

   ISYM  = 1/2/3   x/y/z Cartesian cutting plane

 endif

   IRDS  = 0   Do not redistribute seam curves, and do not find seam points
           1   Redistribute seam curves, and find seam points

   SCFILT > 0     Remove seam curves shorter than SCFILT under IMODE = 1
          = -1.0  Use default filter value for removing short seam curves
          = 0.0   Do not filter seam curves

 if IMODE = 1

    ANG  : an edge is picked as a seam edge if the surface normals of the two adjacent
           triangles deviate from each other by ANG degrees ( e.g., a flat plate would
           have ANG=0 )

 else if IMODE = 2

    ANG  : coordinate of Cartesian cutting plane

 endif

     NPAIR = number of pairs of vertices to connect for IMODE = 3

* GAPTOL >0 absolute distance tolerated in gaps between surface
            panel networks
         <0 use default tolerance computed as fraction of diagonal of
            bounding box of all surface panels

   DSSC >0 global grid spacing for redistributed seam curves
        <0 use default

* ETAMX,DETA,DFAR >0 marching distance, initial and end spacing for SURGRD
                  <0 use defaults