Drag and Drop Orthographic

[long elm]

How do I make an object drag along the orthographic camera axis instead of like this?

public class DragandDrop : MonoBehaviour
{
    Vector3 mousePosition;

    private Vector3 GetMousePos(){
        return Camera.main.WorldToScreenPoint(transform.position);
    }

    private void OnMouseDown(){
        mousePosition = Input.mousePosition - GetMousePos();
    }

    private void OnMouseDrag(){
        transform.position = Camera.main.ScreenToWorldPoint(Input.mousePosition - mousePosition);
    }

This was the code used

[median canopy]

Make a plane with new Plane(Vector3.up, transform.position) and raycast to the plane. There's an example in the documentation that can be adapted: https://docs.unity3d.com/ScriptReference/Plane.Raycast.html

[long elm]

Okay, let me try that, thank you

private Vector3 offset;
    private float initialY;

    void OnMouseDown()
    {
        initialY = transform.position.y;
        Vector3 mouseWorldPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.WorldToScreenPoint(transform.position).z));
        offset = transform.position - mouseWorldPos;
    }

    void OnMouseDrag()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        Plane plane = new Plane(Vector3.up, new Vector3(0, initialY, 0)); // Plane at initial Y
        float distance;

        if (plane.Raycast(ray, out distance))
        {
            Vector3 pointOnPlane = ray.GetPoint(distance);
            transform.position = new Vector3(pointOnPlane.x + offset.x, initialY, pointOnPlane.z + offset.z);
        }
    }