from raytracer.matrices import scaling, rotation_z, shearing
from raytracer.rays import Ray
from raytracer.shapes import Sphere
from raytracer.tuples import Point, Color
if __name__ == '__main__':
ray_origin = Point(0, 0, -5)
wall_z = 10
wall_size = 7.0
canvas_pixels = 100
pixel_size = wall_size / canvas_pixels
half = wall_size / 2
canvas = Canvas(canvas_pixels, canvas_pixels)
red = Color(1, 0, 0)
sphere = Sphere()
sphere.transformation = scaling(1, .5, 1).shear(1, 0, 0, 0, 0, 0)
for y in range(canvas_pixels):
world_y = half - pixel_size * y
for x in range(canvas_pixels):
world_x = -half + pixel_size * x
position = Point(world_x, world_y, wall_z)
ray = Ray(ray_origin, (position - ray_origin).normalize())
if sphere.intersect(ray).hit():
canvas.write_pixel(x, y, red)
write_ppm_to_file(canvas.to_ppm(),
f'..{sep}..{sep}resources{sep}circle.ppm')
def test_ray_miss():
r = Ray(Point(0, 2, -5), Vector(0, 0, 1))
s = Sphere()
i = s.intersect(r)
assert len(i) == 0