One of the functions of the brain plugin I'm working on is to apply HAP files to the viewer by trigger phrases, conditions, etc. And by adjusting the x, y, z numbers in the HAP file, I've found the following information about movement I thought I'd share with those interested.
Using a 400x400 pixel jpg image for background
Using a standard HTR head figure
-------------------
z = depth (+ = further away) (- = closer up)
z= -40 face close up
z= -30 head close up
z= -20 near full figure head to chest
z= -10 full head to chest with about 40 pixels extra
z= 0 full head to chest with about 120 pixels extra
z= went all the way up to +500, still visible, but tiny
-------------------
center of charater at y appears where in the 400x400 pixels
y= -42 off the down side of the viewer, not visible
y= -30 0 down side of viewer half of charter visible
y= -25 25 down side of viewer
y= -20 50 down side of viewer
y= -10 125 down side of viewer
y=0 200 center of viewer
y=10 278 up side of viewer
y=20 350 up side of viewer
y=25 385 up side of viewer
y=30 400 up side of viewer half of charter visible
y=35 1 8th of character visible
y=40 very edge of characters hair visible
y=41 still a little hair visible
y=42 off the up side of the viewer, not visible
-------------------
center of charater at x appears where in the 400x400 pixels
x= -42 off the left side of the viewer, not visible
x= -30 0 left side of viewer half of charter visible
x= -25 25 left side of viewer
x= -20 50 left side of viewer
x= -10 125 left side of viewer
x= 0 200 center of viewer
x= 10 278 right side of viewer
x= 20 350 right side of viewer
x= 25 385 right side of viewer
x= 30 400 right side of viewer half of charter visible
x= 35 1 8th of character visible
x= 40 very edge of characters hair visible
x= 41 still a little hair visible
x= 42 off the right side of the viewer, not visible