Passive Rider Animation

copyright 2023 Michael Lastufka

Marionette style control points in external source's coordinates:

• All measurements are in inches and degrees.

• Frame coords x="+fore -back" y="+left -right" z="+up - down"

  Hand/Feet Target points provided by external source:

  handL, handR, footL, footR

  Posture provided by external source:

  cm: Center of mass point (between spine and hips)
  spineAxis: Spine Axis vector or unit vector passing through cm

  Controls:

  Shoulder and hip rotation: spinS, spinH

  Main module:

  Rider(handL, handR, footL, footR, cm, spineAxis, spinS, spinH)

  Support modules:

  JointedAppendage(bodyAttachment, medialLen, distalLen, freeEnd, splay, label="Appendage", orient)
CylinderSpan(origin, endPt, radius)

  Support functions:

  ShoulderSocket(side, spinS, tiltAxis, tiltAng)
JointPos(bodyAttachment, medialLen, distalLen, freeEnd, splay, orient)
RotateAroundAxis(pt, axis, angle)
CircleInsect2D(r1,x1,y1,r2,x2,y2,tailSign)
Transpose(A)

  Examples: (View-Animate in Open SCAD using FPS and Steps commented in files)

  1. Rider.scad - Self contained "Dance" animation.
  2. BoxTrot.scad - Solid Box model for Rider to move.
  3. TrikkeAni.scad - Articulated model of a Trikke T8 body powered carving vehicle for Rider to ride.