C# AddForce Relative To Camera Left And Right Movement

Questions & Answers
1

All other answers related to AddForce relative to camera position only explain how to add force forward and backward. I’ve got that part down, but I need to be able to move left and right.

Vector3 pushDir = GameObject.Find("cameraMan").transform.position - transform.position;

if (Input.GetKey("up") || Input.GetKey("down"))
        {
            rb.AddForce(pushDir.normalized * Input.GetAxis("Vertical") * (-10));
        }

This code works fine, I already have a script that rotates the camera and this always moves you forwards/backwards from its perspective. But when I try to write this for left/right movement:

if (Input.GetKey("right") || Input.GetKey("left"))
        {
            rb.AddForce(sideDir.normalized * Input.GetAxis("Horizontal") * (-10));
        }

It still only moves forwards and backwards. I’ve tried pushDir.right, pushDir.normalized.right, I even tried making a perpendicular child for the camera, to see if moving back and forth relative to that object would move me left and right; no dice.
Side note: this is a game about moving around a spinning ball, AddForce is what I’d like to use for that movement.
Any help is much appreciated!

2

push dir is just camera.transform.forwards.
or transform.up.
or transform.right.
or multiply them by -1.0 to go opposite direction…
if you need pushdir to be horizontal… then just copy the vector, zero out the y component, then re-normalize it, to get a flat forwards and sideways push vector.

:slight_smile:

If you must use ( pushDir = targetObjectPosition - cameraPosition).Normalized; … then you can make a side vector like this… side.x = pushDir.z; side.y=0; side.z = -pushDir.x;
happy vectoring !