A question of render.cs

[UMR19]

in render.cs there's vec2 variable called imgPos, i don't know why it times 0.5 and plus 0.5, what does it mean?
Thank you very much if you can answer my questions. : )

[m-schuetz]

At this point, x and y are in normalized device coordinates, i.e., between -1 and 1. We need them between 0 and 1, then multiply them by the image size to get the pixel coordinates.

[UMR19]

thanks for your answer, I finally know the meaning of this. :)