def test_render_world_with_camera(self, default_world):
w = default_world
c = Camera(11, 11, pi / 2)
_from = Point(0, 0, -5)
to = Point(0, 0, 0)
up = Vector(0, 2, 0)
c.transformation = view_transform(_from, to, up)
image = c.render(w)
assert image.pixel_at(5, 5) == Color(0.38066, 0.47583, 0.2855)
def test_arbitrary_view_transformation(self):
_from = Point(1, 3, 2)
to = Point(4, -2, 8)
up = Vector(1, 1, 0)
t = view_transform(_from, to, up)
assert t == Matrix([[-0.50709, 0.50709, 0.67612, -2.36643],
[0.76772, 0.60609, 0.12122, -2.82843],
[-0.35857, 0.59761, -0.71714, 0.0],
[0.0, 0.0, 0.0, 1.0]])
floor.material.refractive_index = 1.333
under = Sphere()
under.transformation = translation(0, -.5, 0) * scaling(.25, .25, .25)
under.material.color = Color(0, .8, 0)
under.material.refractive_index = 1.5
under.material.ambient = .8
above = Sphere()
above.transformation = translation(1, .5, 0) * scaling(.5, .5, .5)
above.material.color = Color(.2, 0, 0)
above.material.diffuse = .8
above.material.ambient = .5
bottom = Plane()
bottom.transformation = translation(0, -1.25, 0)
bottom.material.pattern = StripePattern(Color.black(), Color(0, .2, .2))
bottom.material.diffuse = .25
bottom.material.ambient = .25
world = World()
world.add(floor, under, above, bottom)
world.light_source = PointLight(Point(-10, 10, -10), Color.white())
camera = Camera(300, 200, pi / 3)
camera.transformation = view_transform(Point(0, 1.5, -5), Point(0, 1, 0), Vector(0, 1, 0))
canvas = camera.render(world)
write_ppm_to_file(canvas.to_ppm(), f'..{sep}..{sep}resources{sep}reflect_refract.ppm')
from raytracer.lights import PointLight
from raytracer.patterns import *
from raytracer.matrices import scaling, rotation_x, rotation_y, rotation_z, translation, view_transform
from raytracer.scene import World
from raytracer.shapes import Cylinder, Plane
from raytracer.tuples import Color, Point, Vector
if __name__ == '__main__':
floor = Plane()
floor.material.color = Color(.8, .8, .8)
floor.material.reflective = .2
cylinder = Cylinder(closed=True)
cylinder.maximum = 0.25
cylinder.material.color = Color(.8, 0, 0)
cylinder.material.reflective = .6
cylinder.transformation = translation(0, 1, 0)
world = World()
world.add(floor, cylinder)
world.light_source = PointLight(Point(-10, 10, -10), Color.white())
camera = Camera(160, 120, pi / 3)
camera.transformation = view_transform(Point(0, 1.5, -5), Point(
0, 1, 0), Vector(0, 1, 0)) * rotation_y(-pi / 4) * rotation_x(-pi / 6)
canvas = camera.render(world)
write_ppm_to_file(canvas.to_ppm(),
f'..{sep}..{sep}resources{sep}cylinders.ppm')
def test_view_transformation_moves_the_world(self):
_from = Point(0, 0, 8)
to = Point(0, 0, 0)
up = Vector(0, 1, 0)
t = view_transform(_from, to, up)
assert t == translation(0, 0, -8)
def test_view_transformation_looking_in_z_positive_direction(self):
_from = Point(0, 0, 0)
to = Point(0, 0, 1)
up = Vector(0, 1, 0)
t = view_transform(_from, to, up)
assert t == scaling(-1, 1, -1) # reflecting across z and x
def test_view_transformation_for_default_orientation(self):
_from = Point(0, 0, 0)
to = Point(0, 0, -1)
up = Vector(0, 1, 0)
t = view_transform(_from, to, up)
assert t == Matrix.identity()
