public Quaternion GetLimbRotationAtFrame(
int limbIndex,
IAnimation animation,
int frame)
{
var trackIndex = limbIndex * 3;
// TODO: This doesn't look like it should be needed.
if (trackIndex > animation.TrackCount - 1)
{
trackIndex = 0;
}
var xTrack = animation.GetTrack(trackIndex);
var yTrack = animation.GetTrack(trackIndex + 1);
var zTrack = animation.GetTrack(trackIndex + 2);
this.WrapFrame_(xTrack, frame, out var xFrame);
this.WrapFrame_(yTrack, frame, out var yFrame);
this.WrapFrame_(zTrack, frame, out var zFrame);
var xFrames = xTrack.Frames;
var yFrames = yTrack.Frames;
var zFrames = zTrack.Frames;
var r2d = Math.PI / 180;
var x = this.AngleToRad_(xFrames[xFrame]) * r2d;
var y = this.AngleToRad_(yFrames[yFrame]) * r2d;
var z = this.AngleToRad_(zFrames[zFrame]) * r2d;
return(this.GetQuaternion_(x, y, z));
}