How to throw a rigidbody along line renderer?

Questions & Answers
1

I’m trying to write a realistic grenade throw. I’m using the below code to draw a line renderer arc between my player and and a point that follows the mouse.

void Update(){
                    var pointList = new List<Vector3>();
                    float vertecCount = 12;
                    for(float ratio = 0; ratio <=1; ratio += 1 / vertecCount){
                        var tangent1 = Vector3.Lerp(transform.position, point2.position, ratio);
                        var tangent2 = Vector3.Lerp(point2.position, grenadeTarget.transform.position, ratio);
                        var curve = Vector3.Lerp(tangent1, tangent2, ratio);
                        pointList.Add(curve);
                    }
                    grenadeArc.positionCount = pointList.Count;
                    grenadeArc.SetPositions(pointList.ToArray());
}

How can I instantiate a sphere and throw it along the line renderer using AddForce? I need to use the rigidbody so the grenade can bounce realistically.

2

Probably not “along”, because a rigidbody’s trajectory would be a parabola instead of straight line (if there’s no drag / velocity damping). So in order to throw a grenade to a specific point in world, you need to find this parabola and use its derivative to get a starting velocity. Ofc there are infinitely many parabolas, so you could either fix the throw speed or the angle.

I’d suggest that you project everything on a 2D plane (to simplify the math) that contains the throw origin, the destination point, and it’s vertical. Your starting point (from where you throw) will be at point [0;0]. Then, use your math skills to find the parabola that crosses the origin and destination points.