Copies other matrix into mat */

return current time in seconds */

* Given an axis and angle, compute quaternion. */

* Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet * if we are away from the center of the sphere. */

* Ok, simulate a track-ball. Project the points onto the virtual * trackball, then figure out the axis of rotation, which is the cross * product of

* Build a rotation matrix, given a quaternion rotation. * */

* Try to approximate a cubic Bézier with a single quadratic. * * The quadratic control point is placed at the intersection of the * tangent lines a

* Check whether a cubic error curve stays within `tolerance` of the origin. * * Given control points (p0, p1, p2, p3) of a cubic that represents the

* Recursively convert a cubic into quadratic segments, emitting each * via glyphy_conic_to. */