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Rotation between two unit vectors


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Sorry it is taken so long to get a reply. Hopefully, if I have understood what setFromUnitVectors does,  the following does the equivalent where v1 and v2 are unit vectors

var angle = Math.acos(BABYLON.Vector3.Dot(v1, v2));
var axis = BABYLON.Vector3.Cross(v1,v2);
var quaternion = BABYLON.Quaternion.RotationAxis(axis, angle);
var matrix = BABYLON.Matrix.Identity();
BABYLON.Matrix.FromQuaternionToRef(quaternion, matrix);

As you have not given the context for use I have not tested the above.

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