Compute the bone radii from the vertices.  It's more error-prone than I
expected, but it more or less works.
Attempting to rotate longitudinally at elbow, rather than wrist.
That didn't really help.  What did help was simply ignoring the wrist
constraints.
Working on testing the Leap/Hydra hands against the avatar body.
Merge branch 'master' of https://github.com/worklist/hifi
Skip the hands' parents as well as the hands themselves.
Add a scale factor to bone radii.
Missed a scale multiplier.
first pass at adding actual particles to the ParticleTree
Merge branch 'master' of https://github.com/worklist/hifi into particle_details
Don’t render collision if not own avatar,  don’t check for collisions with voxel tree if not me.
Merge branch 'master' of https://github.com/worklist/hifi
Option to render collision proxies, more general avatar penetration test, fix
for meshes with only one joint influence.
Test hand against other avatars.
Merge branch 'master' of https://github.com/worklist/hifi
Render the palm collision proxies.
Merge branch 'master' of https://github.com/worklist/hifi
Called addPenetrations wrong.
Merge branch 'master' of https://github.com/worklist/hifi
Basic sphere/capsule-cone penetration test.