* Removed MyAvatar.reset() access from JavaScript
* Added HMD.centerUI() to JavaScript, which can be used to reset the 3D UI sphere around the current HMD orientation.
* Added MyAvatar.clearIKJOintLimitHistory() which can be used to reset any remembered IK joint limit history.
* Added MyAvatar.centerBody() which can be used to instantly re-orient the avatar's so that the hips and toes
are facing the same direction as the current HMD orientation.
away.js now uses the above new API's instead of MyAvatar.reset()
Used to disable the 'room-scale' avatar re-centering code.
Disabling this can prevent sliding when the avatar is supposed to be sitting or mounted on a stationary object.
Also, removed a bunch of old, unused leaning and torso twisting code.
* Bug fix for eye tracking in HMD, the "up" orientation of your eyes now match your head.
* DebugDraw: added drawRay method.
* Application: Renamed preRender to postUpdate
* AvatarManager: added postUpdate method that iterates over all avatars.
* MyAvatar: Renamed preRender to preDisplaySide
* MyAvatar: split preRender code into postUpdate and preDisplaySide.
* Removed "Show who is looking at me", "Render focus indicator" and "Render lookat target" debug draw.
* Split "Show Look At Vectors" into "Show My Look At Vectors" and "Show Other Look At Vectors", to make it easier to debug eye tracking.
* "Show Look at Vectors" now draws the right eye red and the left eye blue.
* Removed Avatar and MyAvatar renderBody
* Removed look at rendering from head.
* GLMHelpers: Bugfix for generateBasisVectors when up primary and secondary axis were orthogonal
Calling glm::axis() on an identity quaternion does not result in a normalized vector.
This vector was used within Rig::updateEyeJoint() to limit the rotation of the eye balls,
to prevent the eyes from rolling back into the avatar's head.
If the avatar was looking straight ahead, this could result in bad quaternions in the eye ball
joint matrices, which in turn would cause the eye ball mesh or any mesh influenced by the eyeball joints
not to render.
Previously we were using a infinitely tall vertical cylinder
to push hand IK targets out of the body, this had the
side-effect of preventing the hands from being raised over
the head. Now, we collide against the same 3d capsule
used by the physics system for avatar collisions.
There were three things that were causing issues with eye look at vectors while wearing an HMD.
1) The matrix returned by AvatarUpdate->getHeadPose() was in the wrong space, it should be in avatar space.
it was actually returning a matrix in sensor/room space.
2) The lookAtPosition was incorrect while wearing an HMD and with no avatars to look at.
3) The eye rotation limits in Rig::updateEyeJoint were relative to the model's zero orientation, NOT relative to the head.
this was causing the eyes to hit limits when the avatar head turned.
