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Question by rageingnonsense · Nov 30, 2015 at 09:04 PM · transformbonematrixmatrix4x4

Matrix to transform bone orientation to world orientation

I have a need to manipulate bones in my scripts, as well as get transform information from them. When my bones import, they have unusual directions relative to the parent mesh.

For instance, if my object faces z forward, its bones are facing z up!

I have gotten around this by creating a temporary gameobject, parenting the bone to the gameobject, and manipulating that; like so:

 private void TransformBonesAlongCurve(LinkedList<Transform> bones, BezierCurve curve, float percentage = 1, Color debugColor = default(Color)) {
             // TODO: can this just be a static object we keep somehere so we can avoid creation/destruction?
             GameObject guide = new GameObject("Guide");
            
             float lineSteps = bones.Count;
             int count = 1;
             Vector3 lastPoint = curve.GetPoint(0);            
             foreach (Transform bone in bones) {
                 float t = MathExtensions.Normalize01(1, lineSteps, count) * percentage;
                 guide.transform.position = bone.position;
                 Transform parentBuffer = bone.parent;
 
                 bone.parent = guide.transform;
                 guide.transform.position = curve.GetPoint(t);
                 guide.transform.rotation = Quaternion.LookRotation(transform.InverseTransformDirection(curve.GetDirection(t)));
                 bone.parent = parentBuffer;
 
                 //Debug.DrawLine(lastPoint, curve.GetPoint(t), debugColor, 10000);
                 lastPoint = curve.GetPoint(t);
 
                 count++;
             }
 
             Destroy(guide);
         }

However, this feels clunky and hacky. It works, but I would prefer to do this the "right" way with a matrix operation. How would one re-write the function above to use a Matrix4x4 instead of the temporary gameobject?

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