def __init__(self, origin: Vec3, focal_length: float, view_dir: Vec3,
l: int, r: int, b: int, t: int):
self.origin = origin
self.focal_length = focal_length
self.view_dir = view_dir.normalize()
self.l = l
self.r = r
self.b = b
self.t = t
# Construct coordienate frame for camera (2.4.7)
self.w = self.view_dir.scale(-1)
up_vector = Vec3(0, 0, 1)
self.u = up_vector.cross(self.w)
self.u = self.u.normalize()
self.v = self.w.cross(self.u)
def __init__(self, origin: Vec3, dir: Vec3):
self.origin = origin
self.dir = dir.normalize()