INNER CODE UNIT · Python

xi1_all

SedulousWorks/SedulousEngine · Scripts/generate_brdf_lut.py:63

    xi1_all = sample_indices.astype(np.float64) / NUM_SAMPLES
    xi2_all = radical_inverse_vdc(sample_indices)

    result_scale = np.zeros((SIZE, SIZE), dtype=np.float64)
    result_bias = np.zeros((SIZE, SIZE), dtype=np.float64)

    for y in range(SIZE):
        if y % 32 == 0:
            elapsed = time.time() - start
            print(f"  Row {y}/{SIZE} ({100*y//SIZE}%) [{elapsed:.1f}s]", file=sys.stderr)

        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))

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