[SOLVED] How can I get the world coords of the mouse (2D).

Graphics
17

The method above gives me inaccurate results (the ray direction seems a bit offset). I came up with the following code using the Unproject method of the GraphicsDevice.Viewport and the result is perfect. I also added the groundplane-ray-intersection stuff.

    public Vector3 GetMouseWorldPosition(Point screenPosition)
    {
        Vector3 nearWorldPoint = GraphicsDevice.Viewport.Unproject(new Vector3(screenPosition.X, screenPosition.Y, 0), Projection, View, World);
        Vector3 farWorldPoint = GraphicsDevice.Viewport.Unproject(new Vector3(screenPosition.X, screenPosition.Y, 1), Projection, View, World);
        Ray ray = new(nearWorldPoint, farWorldPoint - nearWorldPoint);

        Plane groundPlane = new(Vector3.Zero, Vector3.UnitZ);
        if (ray.Intersects(groundPlane) is float distance)
        {
            Vector3 intersection = ray.Position + distance * ray.Direction;
            return intersection;
        }
        else return Vector3.Zero;
    }

Credits go to: ViewPort Unproject (...) problem.