def camera_translate(scale, axis, sign, camera):
placement = camera["placement"]
position = placement["position"]
orientation = placement["orientation"]
axis = orientation_direction(orientation, axis, sign)
placement["position"] = translate(position, axis, scale)
return
def camera_rotate(scale, axis, sign, camera):
orientation = camera["placement"]["orientation"]
front = orientation["front"]
up = orientation_up(orientation)
up = vector_unit(up)
rotate_axis = orientation_direction(orientation, axis, sign)
front = rotate(front, scale, rotate_axis)
orientation["front"] = vector_unit(front)
if (axis == 2.0):
orientation["right"] = cross_product(orientation["front"], up)
return
