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class Ray
def initialize(origin = Point.new, direction = Vec3.new)
@origin = origin
@direction = direction
end
attr_reader :origin, :direction
def at(time)
@origin + (@direction * time)
end
def colour(world, depth)
return Colour.new if depth <= 0
if rec = world.hit(self, Interval.new(0.0001, Float::INFINITY))
if scat = rec.material.scatter(self, rec)
return scat.colour(world, depth - 1) * rec.material.attenuation
else
return Colour.new(0,0,0)
end
end
unit_dir = direction.unit
a = (unit_dir.y + 1) / 2
Colour.new(1.0, 1.0, 1.0) * (1-a) + Colour.new(0.5, 0.7, 1.0) * a
end
end
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