If I understand correctly, you want to move the focus point?
I think Matso was ported from Skyrim where the focal point was always in the middle of the screen for the purposes of this DOF.
you'll have to get someone to adapt the main process function for it .
or use a different DOF that allows you to change the focus point..
eg petka
#define focus float2(0.5,0.5) //[0.0 to 1.0] Screen coordinates of focus point. First value is horizontal, second value is vertical position. 0 is left/upper, 1 is right/lower.
or gp65cj042
#define FocusPoint float2(0.5, 0.5); //[0.0 to 1.0] Screen coordinates of focus point. First value is horizontal, second value is vertical position. 0 is left/upper, 1 is right/lower.