def __init__(self,lookfrom,lookat,vup,vfov,aspect,aperture,focus_dist): self.lens_radius = aperture /2 theta = vfov * math.pi/180 half_height = math.tan(theta/2) half_width = aspect * half_height self.origin = lookfrom self.w = Vec3.unit_vector(lookfrom -lookat) self.u = Vec3.unit_vector(Vec3.cross(vup,self.w)) self.v = Vec3.cross(self.w,self.u) self.lower_left_corner = self.origin - half_width*focus_dist*self.u -half_height*focus_dist*self.v -focus_dist*self.w self.horizontal = 2*half_width*focus_dist*self.u self.vertical = 2*half_height*focus_dist*self.v
def __init__(self, lookfrom, lookat, vup, vfov, aspect, aperture,
focus_dist, t0, t1):
self.time0 = t0
self.time1 = t1
self.lens_radius = aperture / 2
theta = vfov * math.pi / 180
half_height = math.tan(theta / 2)
half_width = aspect * half_height
self.origin = lookfrom
self.w = Vec3.unit_vector(lookfrom - lookat)
self.u = Vec3.unit_vector(Vec3.cross(vup, self.w))
self.v = Vec3.cross(self.w, self.u)
self.lower_left_corner = self.origin - half_width * focus_dist * self.u - half_height * focus_dist * self.v - focus_dist * self.w
self.horizontal = 2 * half_width * focus_dist * self.u
self.vertical = 2 * half_height * focus_dist * self.v
def scatter(self, r_in,rec):
reflected = Vec3.reflect(Vec3.unit_vector(r_in.direction),rec["normal"])
scattered = Ray(rec["p"],reflected + self.fuzz * Material.random_in_unit_sphere())
attenuation = self.albedo
if Vec3.dot(scattered.direction,rec["normal"]) > 0:
return attenuation,scattered
else:
return None,None
def color(r,world):
rec = world.hit(r,0.0,float('inf'))
if rec is not None:
target = rec["p"]+rec["normal"] + random_in_unit_sphere()
return 0.5 * color(Ray(rec["p"],target-rec["p"]),world)
else:
unit_direction = Vec3.unit_vector(r.direction)
t = 0.5*(unit_direction.y +1.0)
return (1.0-t)*Vec3(1.0,1.0,1.0) + t*Vec3(0.5,0.7,1.0)
def scatter(self, r_in, rec):
reflected = Vec3.reflect(Vec3.unit_vector(r_in.direction),
rec["normal"])
scattered = Ray(
rec["p"], reflected + self.fuzz * Material.random_in_unit_sphere())
attenuation = self.albedo
if Vec3.dot(scattered.direction, rec["normal"]) > 0:
return attenuation, scattered
else:
return None, None
def color(r,world,depth):
rec = world.hit(r,0.001,float('inf'))
if rec is not None:
if depth >= 50:
return Vec3(0,0,0)
attenuation,scattered =rec["material"].scatter(r,rec)
if attenuation is not None:
return attenuation * color(scattered,world,depth +1)
else:
return Vec3(0,0,0)
else:
unit_direction = Vec3.unit_vector(r.direction)
t = 0.5*(unit_direction.y +1.0)
return (1.0-t)*Vec3(1.0,1.0,1.0) + t*Vec3(0.5,0.7,1.0)
def color(r, world, depth):
rec = world.hit(r, 0.001, float('inf'))
if rec is not None:
if depth >= 50:
return Vec3(0, 0, 0)
attenuation, scattered = rec["material"].scatter(r, rec)
if attenuation is not None:
return attenuation * color(scattered, world, depth + 1)
else:
return Vec3(0, 0, 0)
else:
unit_direction = Vec3.unit_vector(r.direction)
t = 0.5 * (unit_direction.y + 1.0)
return (1.0 - t) * Vec3(1.0, 1.0, 1.0) + t * Vec3(0.5, 0.7, 1.0)
def color(r): unit_direction = Vec3.unit_vector(r.direction) t = 0.5*(unit_direction.y +1.0) return (1.0-t)*Vec3(1.0,1.0,1.0) + t*Vec3(0.5,0.7,1.0)
def color(r):
if hit_sphere(Vec3(0,0,-1),0.5,r):
return Vec3(1,0,0)
unit_direction = Vec3.unit_vector(r.direction)
t = 0.5*(unit_direction.y +1.0)
return (1.0-t)*Vec3(1.0,1.0,1.0) + t*Vec3(0.5,0.7,1.0)
