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??????? ??????

point enemy to player

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I need to know how calculate the rotationY on my enemy object in order to point them to enemy, I am drawing this way my objects:
My player:

Matrix rotation = Matrix.CreateFromYawPitchRoll(-yaw, -pitch, roll);

Matrix[] transforms = new Matrix[myModel.Bones.Count];
myModel.CopyAbsoluteBoneTransformsTo(transforms);
Matrix scaling = Matrix.CreateScale(80);
effect.World = transforms[mesh.ParentBone.Index] *
Matrix.CreateScale(1 / mesh.BoundingSphere.Radius)
* scaling * rotation * translation;


My enemy:

Matrix scaling = Matrix.CreateScale(40);
effect.World = transforms[meshh.ParentBone.Index] *scaling*
Matrix.CreateRotationX(-250.0f)
* Matrix.CreateTranslation(position);
enemymat = effect.World;

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