INNER CODE UNIT · Python

roughness

SedulousWorks/SedulousEngine · Scripts/generate_brdf_lut.py:74

        roughness = (y + 1) / SIZE
        a = roughness * roughness
        a2 = a * a

        # GGX importance sampling: compute H for all samples.
        cos_theta = np.sqrt((1.0 - xi2_all) / (1.0 + (a2 - 1.0) * xi2_all))
        sin_theta = np.sqrt(np.maximum(1.0 - cos_theta * cos_theta, 0.0))
        phi = 2.0 * np.pi * xi1_all

        # H in tangent space (N = Z-up).
        Hx = np.cos(phi) * sin_theta
        Hy = np.sin(phi) * sin_theta
        Hz = cos_theta

        # Geometry k for IBL: k = a / 2 (a = roughness^2).
        k = a * 0.5

        # NdotV values for this row (all x values).

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