How to map normalized coordinates from [0..Screen.width] to [-1..+1]?

[asperatology]

I am playing around with

Camera.main.ScreenToWorldPoint()

But the values are not updating immediately. I feel this is the key to map normalized mouse coordinates from positive only [0…Screen.width] to [-1…+1].

Another possible way is to do:

normalized = (Input.mousePosition - Screen) / Screen

((Input.mousePosition) / Screen + Origin) * Scale?

But I am having a hard time calculating negatives of a positive-only coordinates and how to convert them.

Anyone know some hints on how to do this? Thanks in advance.

[asperatology]

Found the correct answer:

http://stackoverflow.com/questions/4154969/how-to-map-numbers-in-range-099-to-range-1-01-0

Use a linear mapping:

y =((x /MAX)*2)-1
How it works:

• Divide by MAX: This normalizes the range from [0, MAX] to [0, 1].
• Multiply by 2: This increases the range to [0, 2].
• Subtract 1: This is a translation which gives [-1, 1].

You can of course combine the steps ((x / MAX) * 2) into a single division if you wish. I just split it up for clarity.