public static RigidTransform GetTrackOffsets(AnimationTrack track, Transform transform)
{
Vector3 position = track.position;
Quaternion rotation = track.rotation;
if (transform != null && transform.parent != null)
{
position = transform.parent.TransformPoint(position);
rotation = transform.parent.rotation * rotation;
MathUtils.QuaternionNormalize(ref rotation);
}
return(RigidTransform.Compose(position, rotation));
}
// Given a world space position and rotation, updates the clip offsets to match that
public static RigidTransform UpdateClipOffsets(AnimationPlayableAsset asset, AnimationTrack track, Transform transform, Vector3 globalPosition, Quaternion globalRotation)
{
Matrix4x4 worldToLocal = transform.worldToLocalMatrix;
Matrix4x4 clipMatrix = Matrix4x4.TRS(asset.position, asset.rotation, Vector3.one);
Matrix4x4 trackMatrix = GetTrackMatrix(transform, track);
// Use the transform to find the proper goal matrix with scale taken into account
var oldPos = transform.position;
var oldRot = transform.rotation;
transform.position = globalPosition;
transform.rotation = globalRotation;
Matrix4x4 goal = transform.localToWorldMatrix;
transform.position = oldPos;
transform.rotation = oldRot;
// compute the new clip matrix.
Matrix4x4 newClip = trackMatrix.inverse * goal * worldToLocal * trackMatrix * clipMatrix;
return(RigidTransform.Compose(newClip.GetColumn(3), MathUtils.QuaternionFromMatrix(newClip)));
}