def evaluate_V(self, n, l, v, material):
alpha = np.maximum(1e-1, sqr(material.roughness))
n_dot_l = sat_dot(n, l) + 1e-5
n_dot_v = sat_dot(n, v) + 1e-5
h = half_direction(l, v)
n_dot_h = sat_dot(n, h) + 1e-5
v_dot_h = sat_dot(v, h) + 1e-5
return self.V(n_dot_v=n_dot_v,
n_dot_l=n_dot_l,
n_dot_h=n_dot_h,
v_dot_h=v_dot_h, alpha=alpha)
def __call__(self, n, l, v, material):
alpha = np.maximum(1e-1, sqr(material.roughness))
n_dot_l = sat_dot(n, l) + 1e-5
n_dot_v = sat_dot(n, v) + 1e-5
h = half_direction(l, v)
n_dot_h = sat_dot(n, h) + 1e-5
v_dot_h = sat_dot(v, h) + 1e-5
D = self.D(n_dot_h=n_dot_h, alpha=alpha)
F = self.F(v_dot_h=v_dot_h, F0=material.F0)
V = self.V(n_dot_v=n_dot_v,
n_dot_l=n_dot_l,
n_dot_h=n_dot_h,
v_dot_h=v_dot_h, alpha=alpha)
return 0.25 * D * F * V
def evaluate_F(self, n, l, v, material):
h = half_direction(l, v)
v_dot_h = sat_dot(v, h) + 1e-5
return self.F(v_dot_h=v_dot_h, F0=material.F0)
def evaluate_D(self, n, l, v, material):
alpha = np.maximum(1e-1, sqr(material.roughness))
h = half_direction(l, v)
n_dot_h = sat_dot(n, h) + 1e-5
return self.D(n_dot_h=n_dot_h, alpha=alpha)