"the way the city-generator tends to throw buildings into each other produces some mesmerising results" : THANK YOU !
otherwise , i used the simple first person controller included in unity at that time , and it s performing really bad when you run/walk a slop and jump , also when you press jump while in the air , then land . "Z-fighting" is entirely due to randomness you re right , i m not sure i could test on this at that time , the way i programmed it . Thank you on you great comment ! Cheers Markus