Transforms are not applied correctly, or need to be modified when using
pythreejs geometries.

Bind Mesh objects to the time slider value with a TrajectoryLink, which
contains the object's position and quaternion trajectories.

Use requestAnimationFrame instead of getInterval for more efficient
animation.

Change default number of segments in a Circle geometry to 32. Rotate the
ceiling plate about the y-axis by pi/2 in the mass spring damper example
so that the plate axis is parallel to the motion of the mass.