April 05
Prof. Ismael H. F. Santos -  ismael@tecgraf.puc-rio.br                                                          2
Calcula o sistema  -  xe ye ze
center
ze
eye
vup
z0
y0
x0
view
ze = – view / ||view||
vup
center
eye
z0
y0
x0
view
dados:
eye, center, up
view = center - eye