trajectory projectile line

private LineRenderer lineRenderer;
public int lineResolution;
public float launchForce = //same que l'addforce j'pense;
public float gravity = // same que l'editor bg

	void MakeTrajectory()
    {
        Vector3[] trajectoryPoints = new Vector3[lineResolution];
        Vector3 throwVelocity = startPoint.forward * launchForce;

        for (int i = 0; i < lineResolution; i++)
        {
            float time = i * 0.1f;
            trajectoryPoints[i] = TrajectoryPoint(startPoint.position, throwVelocity, time);
        }

        lineRenderer.positionCount = lineResolution;
        lineRenderer.SetPositions(trajectoryPoints);
    }

    Vector3 TrajectoryPoint(Vector3 origin, Vector3 velocity, float time)
    {
        float x = velocity.x * time;
        float y = velocity.y * time + 0.5f * gravity * time * time;
        float z = velocity.z * time;

        return new Vector3(x, y, z) + origin;
    }