def Li(self, scene: Scene, renderer: Renderer, ray: Ray, intersection: Intersection, sample: Sample) -> Spectrum:
L = Spectrum(0.0)
wo = -ray.direction
bsdf = intersection.get_bsdf(ray)
# Compute emitted light if ray hit an area light source
L += intersection.Le(wo)
if len(scene.lights) > 0:
if self.strategy == LightStrategy.SAMPLE_ALL_UNIFORM:
L += UniformSampleAllLights(scene, renderer, intersection.differentialGeometry.point,
intersection.differentialGeometry.normal, wo,
ray.time, bsdf, sample, self.lightSampleOffsets, self.bsdfSampleOffsets)
elif self.strategy == LightStrategy.SAMPLE_ONE_UNIFORM:
L += UniformSampleOneLight(scene, renderer, intersection.differentialGeometry.point,
intersection.differentialGeometry.normal, wo,
ray.time, bsdf, sample, self.lightSampleOffsets, self.bsdfSampleOffsets,
self.lightNumOffset)
return L
def Li(self, scene: Scene, renderer: Renderer, ray: Ray, intersection: Intersection, sample: Sample)->Spectrum:
occlusion = 0
intersection.ray_epsilon = infinity_max_f
bsdf = intersection.get_bsdf(ray)
p = bsdf.dgShading.point
n = maths.tools.get_face_forward(intersection.differentialGeometry.normal, -ray.direction)
for i in range(self.samples_count):
w = maths.tools.get_uniform_sample_sphere(random(), random())
if Vector3d.dot(w, n) < 0.0:
w = -w
r = Ray(p, w, 0.01, self.max_distance)
if scene.get_is_intersected(r):
occlusion += 1
return Spectrum(1.0-(float(occlusion) / float(self.samples_count)))
