# replicate_udc_1
# written by John Dannenhoffer

DESPMTR   Rdish     30.0
DESPMTR   Rring     1.00
DESPMTR   Rspoke    0.05
DESPMTR   dtheta    5.00
CFGPMTR   Nsect     60
CFGPMTR   Nring     8

# make the revolved feature and extract a sector
PATBEG    iring   Nring
   SET    z       Rdish-Rdish*cosd(iring*dtheta)
   SET    x             Rdish*sind(iring*dtheta)
   TORUS  0  0  z  0  0  1  x  Rring
      SELECT    FACE  @nbody 1
      ATTRIBUTE _erep iring
      SELECT    FACE  @nbody 4
      ATTRIBUTE _erep iring+Nring
   ROTATEZ 90
   STORE   body  iring
PATEND

# spine 1
MARK
   SET       Roff    0.90*Rring
   PATBEG    iring   Nring
      UDPRIM    supell  rx Rspoke   ry Rspoke   n 2
      ROTATEY   90
      TRANSLATE 0  0  Roff
      ROTATEY   -iring*dtheta   Rdish  0
      SET       Roff  -Roff
   PATEND
RULE
ROTATEZ    +1.5
RESTORE    body -1
UDPRIM     ganged  op $UNION

# spine 2
MARK
   SET       Roff    0.90*Rring
   PATBEG    iring   Nring
      SET       z       -Roff
      UDPRIM    supell  rx Rspoke   ry Rspoke   n 2
      ROTATEY   90
      TRANSLATE 0  0  -Roff
      ROTATEY   -iring*dtheta   Rdish  0
      SET       Roff  -Roff
   PATEND
RULE
ROTATEZ   -1.5
UNION

# extract a wedge of the configuration
SKBEG      0                    0                   -20
   LINSEG 40*cosd(-180/Nsect)  40*sind(-180/Nsect)  -20
   LINSEG 40*cosd(+180/Nsect)  40*sind(+180/Nsect)  -20
   LINSEG  0                    0                   -20
SKEND
EXTRUDE   0  0  40
INTERSECT

# replicate all around the wheel
UDPRIM    $$/replicate   ncopy Nsect

END