Problem with Quaternions

Unity Engine
1

So I am trying to make it so a player can pick up an object and rotate it using the mouse. I have the picking up part done, but when I try to make it rotate the object I am having a hard time rotating it properly. What I think my code should do it rotate it towards the players face because the axis of rotation is the player’s right. The first time I rotate it after starting the game, it works perfectly every time. But after I rotate it once, it messes up the rotation and it no longer rotates along the axis.

My current code chunks:

Quaternion quatRotangle(Vector3 inVec, float a) {
		Quaternion outQuat;
		float quatMag;
	    // Here we calculate the sin( theta / 2) once for optimization
	    float result = Mathf.Sin( a / 2.0f );
	
	    // Calculate the x, y and z of the quaternion
	    float x = inVec.x * result;
	    float y = inVec.y * result;
	    float z = inVec.z * result;
	
	    // Calcualte the w value by cos( theta / 2 )
	    float w = Mathf.Cos( a / 2.0f );
		quatMag = Mathf.Sqrt (x*x+y*y+z*z+w*w);
	    outQuat = new Quaternion(x/quatMag, y/quatMag, z/quatMag, w/quatMag);
		
		//outQuat = outQuat.normalize();
		return outQuat;
	}

and to rotate towards the player

rot = rot*quatRotangle(cam.transform.right,Input.GetAxis("Mouse Y"));
tar.transform.rotation = rot;
2

Maybe you should try using transform.LookAt ?

3

I don’t think I can use that, it is supposed to work in the GMod way, which can be seen here http://youtu.be/r-1BSa--FGw?t=21s .

4

Hello, here to answer my own question. As I was looking around in transform I found transform.RotateAround which is exactly what my function was for, so I replaced it and it works fine now. :smile: