# Transforming Vector3 points to Vector2

I'm trying to convert a list of Vector3 on Vector2 because I need to put them in a graph like this: The graph is easy to do having the Vector2 list, but I have a non-trivial problem obtaining the Vector3 Points: As you can see, I get them using a Plane which can be in any orientation and rotation.
What formula can I use to convert them so I get X,Y points no matter the rotation of the plane. PD: I use this code to do the job but it doesn't work on different positions and rotations of the plane...

projectedPosition.X = Vector3.Dot(ballPosition - planeOrigin, planeX);
projectedPosition.Y = Vector3.Dot(ballPosition - planeOrigin, planeY);


PlaneY = Vector3.up & PlaneX = plane.transform.forward

PlaneY = Vector3.up & PlaneX = plane.transform.forward

One of these things is not like the other. You're using a global axis vector for one, and the plane's axis vector for the other. Try this instead:

PlaneY = -plane.transform.right;
PlaneX =  plane.transform.forward;


Or:

var localPosition = plane.transform.InverseTransformPoint(ballPosition);

projectedPosition.X =  localPosition.Z;
projectedPosition.Y = -localPosition.X;

• I see it works correctly, but... I got a problem with the orientation, since the plane can be any Euler angle like (0,90,0) to let's say... (90,0,270) the result sometimes gives me negative results or sometimes the axis X and Y are swapped. How could I solve this in a clean way :( Mar 23 at 1:59
• It's unclear to me what outcome you want. This code will give you xy positions corresponding to the positions of the balls in the plane's local space, at any angles you choose. What would you like to be different about the output than what you have currently? Mar 23 at 2:07
• I made a quick video: drive.google.com/file/d/1pCjw-3gDlppw3lwXvyw9rBzUaGrHCu2P/… I want to make clear it works, but sometimes I get negative results on the graph (ok I can get Mathf.Abs for each value on the transform.right and forward to fix that) But also sometimes the X axis get's swapped with Y axis so in the graph you can see. So the final question would be... how to obtain a constant Y values for height and distance on X... THANK YOU VERY MUCH! Mar 23 at 2:20