def get_ray_through_pixel(self, col, row):
w = self.screen_width
h = self.screen_height
return Line(vec3(0, 0, 0),
vec3(-w / 2 + col * (w / self.hpixels),
-h / 2 + row * (h / self.vpixels),
-self.distance_to_screen))
def test():
epsilon = 0.0000001
radius = 1.3
s = Sphere(vec3(0, 0, 0), radius)
l1 = Line(vec3(-1, 2, 0), vec3(1, 2, 0))
assert s.intersect(l1) == []
l2 = Line(vec3(-1, 0, 0), vec3(1, 0, 0))
expected = sorted([vec3(-radius, 0, 0),
vec3(+radius, 0, 0)])
got = sorted(s.intersect(l2))
for e, g in zip(expected, got):
assert (e-g).length() < epsilon
l3 = Line(vec3(-1, radius, 0), vec3(1, radius, 0))
got = s.intersect(l3)
print got
assert len(got) == 1 and (got[0] - vec3(0, radius, 0)).length() < epsilon
def test2():
# Assume we are two screen widths from the center, and we have square
# pixels.
hpixels = 200
vpixels = 100
distance_to_screen = 2
screen_width = 1
screen_height = screen_width * vpixels / hpixels
scene = [Sphere(center=vec3(0, 0, -5),
radius= .5,
color=colors['red'])]
img = render(scene, View(distance_to_screen,
screen_width,
screen_height,
hpixels,
vpixels))
img.save("out.png")
