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gleLathe(3gle)


NAME

   gleLathe  -  Sweep  using a Z-axis shear to create an arbitrary contour
   along a helical path.

SYNTAX

   void gleLathe (int ncp,
                   gleDouble contour[][2],
                   gleDouble cont_normal[][2],
                   gleDouble up[3],
                   gleDouble startRadius,     /* spiral starts in x-y plane */
                   gleDouble drdTheta,        /* change in radius per revolution */
                   gleDouble startZ,          /* starting z value */
                   gleDouble dzdTheta,        /* change in Z per revolution */
                   gleDouble startXform[2][3], /* starting contour affine xform */
                   gleDouble dXformdTheta[2][3], /* tangent change xform per revoln */
                   gleDouble startTheta,      /* start angle in x-y plane */
                   gleDouble sweepTheta);     /* degrees to spiral around */

ARGUMENTS

   ncp       number of contour points

   contour   2D contour

   cont_normal
             2D contour normals

   up        up vector for contour

   startRadius
             spiral starts in x-y plane

   drdTheta  change in radius per revolution

   startZ    starting z value

   dzdTheta  change in Z per revolution

   startXform
             starting contour affine transformation

   dXformdTheta
             tangent change xform per revolution

   startTheta
             start angle in x-y plane

   sweepTheta
             degrees to spiral around

DESCRIPTION

   Sweep an arbitrary contour along a helical  path.  The  sweep  will  be
   performed  as  a shear along the z-axis, so that the orientation of the
   contour is displaced, rather than translated, as the contour is swept.

   The axis of the helix lies along the modeling coordinate z-axis.

   An affine transform can be applied as the contour is  swept.  For  most
   ordinary usage, the affines should be given as NULL.

SEE ALSO

   gleSpiral

AUTHOR

   Linas Vepstas (linas@linas.org)



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