[SOLVED] ScreenToWorldPoint movement is moving to wrong place

So I'm sure my project is structured weird, which is why it's giving me issues. Not worked with unity much, I'm a web developer and just playing with Unity as a hobby where I might be able to make something cool years down the road.

My problem is: I am attempting to right click anywhere on the screen and move a gameobject to that location. However when I do this, it doesn't go to the location I am clicking, this is made worse when I zoom. When I zoom I am moving the camera closer to the objects on the z axis.

I am using a perspective camera, but the camera is fixed at 0,0,0 with rotation 0,0,0.
I have planets at 0,0,50
Space backdrop (Quad) at 0,0,60
Ship (the game object I am trying to move) is at 0,1,45 (Slightly closer to the camera than the planets, and slightly above the planet.

My code for ship movement is:

Code (CSharp):

1. if(Input.GetMouseButton(1)) {
2.             Debug.Log("Right clicked, we need to move!");
3.  
4.             Vector3 mousePosition = Input.mousePosition;
5.             Vector3 worldPosition = Camera.main.ScreenToWorldPoint(new Vector3(mousePosition.x, mousePosition.y, Camera.main.nearClipPlane));
6.             worldPosition.z = 45;
7.             transform.DOMove(worldPosition, 1);
8. }

worldPosition.z = 45 is intended to keep the object at 45 so it doesn't get closer or further from the camera.
transform.DOMove is part of DOTween. I get same results with a simple transform.position.

This script is attached to only the main camera.

I'm sure I'm doing a number of things wrong, but hopefully you guys can help me solve this. I've poured a ton of hours into this and tried many different solutions but none of them have worked for me.

 

My approach is to create a ray using Camera.main.ScreenPointToRay, then Raycast and after that, get the hit point, if there is one, else get the point with some calculations.

Try something like this:

Code (CSharp):

1.             Vector3 mousePos = new Vector3(Input.mousePosition.x, 0, Input.mousePosition.y);
2.             Vector3 worldPosition;
3.             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
4.             RaycastHit hit;
5.             if (Physics.Raycast(ray.origin, ray.origin + ray.direction * 100f, out hit))
6.                 worldPosition = hit.point;
7.             else
8.                 worldPosition = ray.origin + ray.direction * 100f;

It might become better or more efficient with some tweaking, but I hope it works

 

It acts about the same. It doesn't go exactly where the mouse is as soon as I zoom in or out.

 

I solved it! It's stupid, but pretty sure it's just because I have my project structured stupid. So if anyone else has this issue, here is what I did.

Code (CSharp):

1. Vector3 mousePosition = Input.mousePosition;
2.  
3. mousePosition.z = mousePosition.z - (Camera.main.transform.position.z - 45);
4.  
5. Vector3 worldPosition = Camera.main.ScreenToWorldPoint(mousePosition);
6.  
7. transform.DOMove(worldPosition, 1);

This is all inside of the Input.getMouseButton
You have to modify the z axis before, not after. If I removed the above - 45 value then the object will follow my mouse at the 0 position, but because I want my ship to be at the 45 position I added the - 45.

If that makes any sense. I've tried something like this many times but I guess I just didn't get it right.

So glad to have it fixed!