RigidBody2D and Rotations

Unity Engine
,
1

I’m trying to create a rotation system using Rigidbodies and this implementation is working when the “orbiting” object is initially stationary

    private void RotateAroundObject()
    {
        //Thrust
        // Get the direction from the player to the center object
        Vector2 toCenter = (transform.position - player.transform.position).normalized;
        // Calculate the desired velocity for a circular orbit
        Vector2 desiredVelocity = Vector2.Perpendicular(toCenter) * Mathf.Sqrt(Physics2D.gravity.magnitude * radius / toCenter.magnitude);
        // Calculate the force to achieve the desired velocity (assuming mass is 1 for simplicity)
        Vector2 force = (desiredVelocity - rb.velocity) * rb.mass / Time.fixedDeltaTime;
        // Apply the force to the player's rigidbody over time
        rb.AddForce(force, ForceMode2D.Force);

        //Rotation
        // Determine the direction of travel
        Vector2 directionOfTravel = rb.velocity.normalized;
        // Calculate the angle in degrees that the player should be rotated
        float angle = Mathf.Atan2(directionOfTravel.y, directionOfTravel.x) * Mathf.Rad2Deg;
        // Set the rotation of the player
        player.transform.rotation = Quaternion.Euler(new Vector3(0, 0, angle - 90)); // Subtracting 90 degrees to align the 'up' direction of the sprite with the direction of travel
    }

(Thank you GPT)

The problem is, when I introduce some velocity before entering the '“gravity field” of the gravity object.
I do this by attaching a circle collider onto another object, with it set to act as a trigger to start this behavior.

The issue now is that on entering the trigger, the player object is deflected away as seen here
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I don’t know what the best approach to allow my object to begin orbiting new gravity objects it interacts with with an initial velocity.

Thanks

2

You’re not rotating the Rigidbody2D using physics; you’re stomping over the Transform so when the physics eventually runs, it’s having to read the Transform and instantly update the Rigidbody2D rotation. Then physics tries to work then you stomp over the rotation again.

Don’t ever write to the Transform, that’s the role of the Rigidbody2D.