Weird behaviour - Vector addition

Unity Engine
1

Hi, I am developing a game on Unity for Android platform. I have run into a basic issue and the question might sound a little stupid to the experts around here. I’ll keep it crisp and to the point.

  1. Does the world coordinate EVER change if I JUST change the camera coordinates? Meaning, If I move my camera right, the world coordinates of the original objects will be the same and the screen coordinates will keep changing. Is this understanding correct?

  2. I have a variable
    var player : Vector3;

When I assign position to this vector, I see a weird behaviour.

player = gameObj_2.GetComponent(Player).transform.position
This puts the player somewhere in the middle of the screen (wherever it was just before this line got executed)
BUT

player = gameObj_2.GetComponent(Player).transform.position + newVector3(0.2,0,0);
This brings the player to the left end of the screen. What is weird is gameObj_2.GetComponent(Player).transform.position.x is positive. So when I add something, it should most definitely move to the right but it is moving to the left. Isn;t this a simple vector addition?
Few more points to help you assess -

  1. The camera is constantly moving to the right at a constant speed.
  2. This is all in 2D.

Any help will be appreciated. Let me know if there is more information required.

2

I am not sure the vector operations always work as we’d expect. For my platform game I had position and speed vector3Ds. And added using the .x and .y properties. Worked fine. For my new Christmas game I thought why can’t I just add the vector to the position and so i did that simply as v3Position += v3Speed and only achieved movement in one direction. Not sure if it was always favoring negative or positive but I saw the same behavior you are describing so changed back to the expanded notation of separate .x and .y

3

Thanks for the inputs GarBenjamin. I’ll try that.

4

The code for adding Vector3s in Unity is literally:

public static Vector3 operator + (Vector3 a, Vector3 b)
{
    return new Vector3 (a.x + b.x, a.y + b.y, a.z + b.z);
}

That’s it; there’s no favoring of anything. As for Transform.position, it will never change unless it is explicitly changed by some action.

–Eric

5

Check out your camera orientation you might have your camera flip upside down.