INNER CODE UNIT · Python

Hx

SedulousWorks/SedulousEngine · Scripts/generate_brdf_lut.py:84

        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).
        ndot_v = np.maximum(np.arange(1, SIZE + 1, dtype=np.float64) / SIZE, 0.001)

        # V in tangent space where N = (0,0,1): V = (sqrt(1 - NdotV^2), 0, NdotV).
        Vx = np.sqrt(1.0 - ndot_v * ndot_v)
        Vz = ndot_v

        # VdotH for all (x, sample) combos.
        VdotH = Vx[:, None] * Hx[None, :] + Vz[:, None] * Hz[None, :]
        VdotH = np.maximum(VdotH, 0.0)

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