How to make player launch toward mouse position, but with a consistent velocity?

Questions & Answers
1

I’ve at least got the player to properly fling toward the mouse position with

rb2d = GetComponent<Rigidbody2D>();

void Torpedo()
    {
        Vector2 mousePosition = Input.mousePosition;
        mousePosition = UnityEngine.Camera.main.ScreenToWorldPoint(mousePosition);
    
        Vector2 Torpedo_Force = new Vector2(mousePosition.x - transform.position.x, mousePosition.y - transform.position.y);
        rb2d.velocity = (Torpedo_Force);
    }

But the problem is the amount of force added is dependent on how far the mouse is from the player. I want the amount of force to be fixed so that I can adjust the power of the launch depending on how long the mouse button is held down for before releasing. How might I be able to prevent the mouse distance from affecting the power of the launch?

2

At the moment, you are only using the magnitude/length of the directional vector. You are on the right path, but may I suggest that you normalize the direction and multiply it by the speed value you want, like so:

float torpedoForce = 20.0f;
Vector2 torpedoDirection= (mousePosition - transform.position).normalized;

         rb2d.velocity = (torpedoDirection * torpedoForce);

Normalizing the vector makes it the length of 1 unit, so then multiplying the speed will make the vector length equal to speed while still facing the same direction.

Cheers