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POFully Rotate a Quaternion to a Vector
 

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  1. POFully Rotate a Quaternion to a Vector
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    <p>I have two objects (target and player), both have Position (Vector3) and Rotation (Quaternion). I want the target to rotate and be facing right at the player. The target, when it shoots something should shoot right at the player. </p> <p>I've seen plenty of examples of slerping to the player, but I don't want incremental rotation, well, I suppose that would be ok as long as I can make the slerp be 100%, and as long as it actually worked.</p> <p>FYI - Im able to use the position and rotation to do plenty of other things and it all works great except this last piece I cant figure out.</p> <p><strong>EDIT</strong></p> <p>Code samples run in the Target's class, Position = the targets position, Avatar = the player.</p> <p>Using the value of 1 for the Slerp isn't work. This code below rotates some, but I think something is way off becuase when it's drawn the target scales up and then down as the player gets closer.</p> <pre><code>var A = new Vector3(Position.X, Position.Y, Position.Z); var B = new Vector3(GameState.Avatar.Position.X, GameState.Avatar.Position.Y, GameState.Avatar.Position.Z); A.Normalize(); B.Normalize(); var angle = Math.Acos(Vector3.Dot(A, B)); var axis = Vector3.Normalize(Vector3.Cross(A, B)); var rotOnAngle = new Quaternion(axis, (float)angle); var newRot = Quaternion.Slerp(Quaternion.Identity, rotOnAngle, 1f); Rotation = newRot; Cannon.Shoot(Position, Rotation, this); </code></pre> <p>I tried using this and it doesn't quite work either...the target does rotate, but not to face the player. But at least the scaling problem goes away.</p> <pre><code>Quaternion q = new Quaternion(); var pos = Vector3.Normalize(Position); var pos2 = Vector3.Normalize(GameState.Avatar.Position);% var a = Vector3.Cross(Position, GameState.Avatar.Position); q.X = a.X; q.Y = a.Y; q.Z = a.Z; q.W = (float)Math.Sqrt(((int)Position.Length() ^ 2) * ((int)GameState.Avatar.Position.Length() ^ 2)) + Vector3.Dot(Position, GameState.Avatar.Position); q.Normalize(); Rotation = q; Cannon.Shoot(Position, Rotation, this); </code></pre>
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