innerhole.py

"""
quick and dirty rhino script to "hole-out" an inner convex angle so an end-mill can carve it
see:
http://www.kontraptionist.com/post/45218053861/slotted-construction-its-a-pretty-nice-thing-to
for the technique it implements

to use it:
- choose a cplane orthogonal to the face
- run the script
- select the object
- select an inside point clockwise of the corner
- select the corner
- select an inside point counterclockwise of the corner
"""

import rhinoscriptsyntax as rs
from collections import defaultdict
from collections import Iterable
import Rhino

def main():

  diameter = 3.0/8.0 * 1.1
  # first, select objects in three orthogonal planes
  obj = rs.GetObject("select object", filter=16) # polysurface
  points = rs.GetPoints(draw_lines=False, max_points=3, base_point=None)

  rs.VectorUnitize(rs.VectorSubtract(points[0], points[1]))
  angle = rs.Angle2(
      (points[1], points[0]),
      (points[1], points[2]),
  )
  print angle
  angle = angle[0]

  point = rs.VectorAdd(
    points[1], 
    rs.VectorRotate(0.5*diameter*rs.VectorUnitize(rs.VectorSubtract(points[2], points[1])), angle/2, (0,0,1))
  )

  p0 = (point.X, point.Y, point.Z + 1000)
  p1 = (point.X, point.Y, point.Z - 1000)

  diameter = rs.GetReal("enter cutter diameter", number=3.0/8.0*1.1)

  circle = rs.AddCircle(p0, diameter/2.0)


  rs.EnableRedraw(False)

  extrusion = rs.ExtrudeCurveStraight(circle, p0, p1)
  rs.BooleanDifference(obj, extrusion, delete_input=True)

  rs.DeleteObject(circle)

  rs.EnableRedraw(True)


if __name__ == '__main__':
  main()