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.