def default_world():
world = World()
world.light = PointLight(point(-10, 10, -10), Color(1, 1, 1))
s1 = Sphere()
s1.material.color = Color(0.8, 1.0, 0.6)
s1.material.diffuse = 0.7
s1.material.specular = 0.2
world.objects.append(s1)
s2 = Sphere()
s2.transform = Matrix.scaling(0.5, 0.5, 0.5)
world.objects.append(s2)
return world
def step_impl(context, shape):
obj = Sphere()
setattr(context, shape, obj)
for row in context.table:
attributes = row['variable'].split('.')
if len(attributes) > 1:
setattr(obj.material, attributes[1], eval(row['value']))
else:
setattr(obj, attributes[0], eval(row['value']))
def step_impl(context):
ball = Sphere()
# ball.material.color = Color(1, 0, 0)
# ball.material.ambient = 0.5
# ball.transform = Matrix.translation(0, -3.5, -0.5)
for row in context.table:
attributes = row['attribute'].split('.')
if len(attributes) > 1:
setattr(ball.material, attributes[1], eval(row['value']))
else:
setattr(ball, attributes[0], eval(row['value']))
context.ball = ball
def hexagon_corner():
corner = Sphere()
corner.transform = Matrix.translation(0, 0, -1) * \
Matrix.scaling(0.25, 0.25, 0.25)
return corner
def ch9():
# Step 1
floor = Plane()
floor.transform = Matrix.scaling(10, 0.01, 10)
floor.material = Material()
floor.material.color = Color(1, 0.9, 0.9)
floor.material.specular = 0
floor.material.pattern = StripePattern(Color(1, 0, 0), Color(0, 0, 1))
# Middle biggest sphere
middle = Sphere()
middle.transform = Matrix.translation(-0.5, 1, 0.5)
middle.material = Material()
middle.material.color = Color(0.1, 1, 0.5)
middle.material.diffuse = 0.7
middle.material.specular = 0.3
middle.material.pattern = RingPattern(Color(1, 0, 1), Color(1, 1, 1))
middle.material.pattern.transform = Matrix.scaling(0.25, 0.5, 0.25)
# Smaller right sphere
right = Sphere()
right.transform = Matrix.translation(1.5, 0.5, -0.5) * Matrix.scaling(0.5, 0.5, 0.5)
right.material = Material()
right.material.color = Color(0.5, 1, 0.1)
right.material.diffuse = 0.7
right.material.specular = 0.3
right.material.reflective = 1.0
# Left yellow sphere
left = Sphere()
left.transform = Matrix.translation(-1.5, 0.33, -0.75) * Matrix.scaling(0.33, 0.33, 0.33)
left.material = Material()
left.material.color = Color(1, 0.8, 0.1)
left.material.diffuse = 0.7
left.material.specular = 0.3
world = World()
world.light = PointLight(point(-10, 10, -10), Color(1, 1, 1))
world.objects.extend([floor, middle, right, left])
camera = Camera(100, 50, 60)
# camera = Camera(500, 250, 60)
camera.transform = view_transform(point(0, 1.5, -5),
point(0, 1, 0),
vector(0, 1, 0))
canvas = camera.render(world)
with open('ch9.ppm', 'w') as fp:
fp.write(canvas.to_ppm())
def step_impl(context):
context.s = Sphere()
def ch7():
# Step 1
floor = Sphere()
floor.transform = Matrix.scaling(10, 0.01, 10)
floor.material = Material()
floor.material.color = Color(1, 0.9, 0.9)
floor.material.specular = 0
# Step 2
left_wall = Sphere()
left_wall.transform = Matrix.translation(0, 0, 5) * Matrix.rotation_y(-45) * \
Matrix.rotation_x(90) * Matrix.scaling(10, 0.01, 10)
left_wall.material = floor.material
# Step 3
right_wall = Sphere()
right_wall.transform = Matrix.translation(0, 0, 5) * Matrix.rotation_y(45) * \
Matrix.rotation_x(90) * Matrix.scaling(10, 0.01, 10)
right_wall.material = floor.material
# Step 4
middle = Sphere()
middle.transform = Matrix.translation(-0.5, 1, 0.5)
middle.material = Material()
middle.material.color = Color(0.1, 1, 0.5)
middle.material.diffuse = 0.7
middle.material.specular = 0.3
# Step 5
right = Sphere()
right.transform = Matrix.translation(1.5, 0.5, -0.5) * Matrix.scaling(
0.5, 0.5, 0.5)
right.material = Material()
right.material.color = Color(0.5, 1, 0.1)
right.material.diffuse = 0.7
right.material.specular = 0.3
# Step 6
left = Sphere()
left.transform = Matrix.translation(-1.5, 0.33, -0.75) * Matrix.scaling(
0.33, 0.33, 0.33)
left.material = Material()
left.material.color = Color(1, 0.8, 0.1)
left.material.diffuse = 0.7
left.material.specular = 0.3
world = World()
world.light = PointLight(point(-10, 10, -10), Color(1, 1, 1))
world.objects.extend([floor, left_wall, right_wall, middle, right, left])
camera = Camera(100, 50, 60)
# camera = Camera(500, 250, 60)
camera.transform = view_transform(point(0, 1.5, -5), point(0, 1, 0),
vector(0, 1, 0))
canvas = camera.render(world)
with open('ch8.ppm', 'w') as fp:
fp.write(canvas.to_ppm())
def ch5and6():
# start the ray at z = -5
ray_origin = point(0, 0, -5)
# put the wall at z = 10
wall_z = 10
wall_size = 7
canvas_pixels = 100
pixel_size = wall_size / canvas_pixels
half = wall_size / 2
canvas = Canvas(canvas_pixels, canvas_pixels)
shape = Sphere()
# Optional sphere transformations - uncomment to see the sphere changes
# shape.transform = Matrix.rotation_z(45) * Matrix.scaling(0.5, 1, 1)
# shape.transform = Matrix.scaling(1, 0.5, 1)
# shape.transform = Matrix.shearing(1, 0, 0, 0, 0, 0) * Matrix.scaling(0.5, 1, 1)
# CH 6
# CH 6.1
shape.material.color = Color(1, 0.2, 1)
# CH 6.2
light_position = point(-10, 10, -10)
light_color = Color(1, 1, 1)
light = PointLight(light_position, light_color)
# for each row of pixels in the canvas
for y in range(canvas_pixels):
# compute the world y coordinate (top = +half, bottom = -half)
# canvas -> world coordinate conversion
# (0, 0) -> (-3.5, 3.5)
# (99, 99) -> (3.43, -3.43)
world_y = half - pixel_size * y
# for each pixel in the row
for x in range(canvas_pixels):
# compute the world x coordinate (left = -half, right = half)
world_x = -half + pixel_size * x
# describe the point on the wall that the ray will target
position = point(world_x, world_y, wall_z)
r = Ray(ray_origin, (position - ray_origin).normalize())
xs = shape.intersect(r)
intersection = xs.hit()
if intersection is not None:
# World position of the intersection
intersect_point = r.position(intersection.t)
# World position of the normal at the point
intersect_normal = intersection.obj.normal_at(intersect_point)
# Reverse ray direction to get vector from intersection to eye
eye = -r.direction
# Color is calculate by the material of the sphere, ambient, diffuse, specular, and the light sources
color = intersection.obj.material.lighting(
light, intersect_point, eye, intersect_normal)
canvas.write_pixel(x, y, color)
with open('ch6.ppm', 'w') as fp:
fp.write(canvas.to_ppm())
def step_impl(context, x, y, z):
s = Sphere()
s.transform = Matrix.translation(x, y, z)
context.s2 = s
def step_impl(context, attribute):
setattr(context, attribute, Sphere())