Dragging/Rotation controled by mouse by camera view

Unity Engine
1

I am trying to create a little system that will allow me get the position of my mouse on the sceen space around a object. and have it control the distance/rotation of the object. So far i have it some what working but i am using a plane to achieve the desired effect, The draw back of this is. If the camera isn’t far enough away to see the place “area!” then i can’t set my distance to maximum etc. Here is what i got so far in my dragging method. I want really to use the “camera view” as the plane effectively to control it all.

 private void Dragging()
    {
        if (isLocalPlayer)
        {
            if (planeD.GetDistanceToPoint(transform.position) != 0)
            {
                planeD= new Plane(dragPlane, transform.position);
            }
       mRay = Camera.main.ScreenPointToRay(Input.mousePosition);

            float intersect = 0.0f;

            if (dragPlane.Raycast(mRay , out intersect ))
            {
                mousePos3D = mRay.GetPoint(intersect );

                dDistance = Mathf.Clamp((mousePos3D - transform.position).magnitude, 0, basePower);

                if (dDistance * powerMulti< 1) dDistance = 0; 
                powerV = mousePos3D - transform.position;
                powerV .Normalize();
                powerV *= dDistance * multiPower;


                line.enabled = true;

                // draw the line
                line.SetPosition(0, transform.position);
                line.SetPosition(1, transform.position + -forceVector / lineDrawMaxDistance);
            }
            pUI.powerBar(forceVector.magnitude);
        }
    }
2

Why not just use Input.mousePosition directly?

3

Okay, Im still struggling a little to get this to work effectively what i am trying to do is have a system like tower unite where it casts a line from the player depending upon what area the mouse is on the screen.

^ reference vid of how the system works.

But every time i trying and get this system to work the line cast’s off randomly to 0,0,0,0 space… if im not using the first method i posted. Any idea’s on how u could achieve this type of system? where u can move your mouse to rotate around the object. Move it futher away to increase power (limited) and then ofc apply force is pretty simple. But still struggling with the mouse around object to draw a line… to then be used as a guide to the direction of the shot.