Problem trying to convert 2d touches to spritekit coordinates manually

Question

I'm trying to convert 2d touches to sprite kit coordinates world space. I know there's some convenience methods such as "convert(_:from:)". but In my scenario i need to do it manually, I just don't know where to start.

Thank you

Answer 1

         let width = screenSize.width
     let height:CGFloat = screenSize2.height

     //convert screen space to cartesian space
     let x = ((point.x * 720) / (width))  - (width)
     let y = ((-point.y * 1280) / (height))  + (height)

that worked, ratios