LightProbeUtility/Assets/LightProbeUtility.cs at master · keijiro/LightProbeUtility · GitHub

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using UnityEngine;
using UnityEngine.Rendering;

public static class LightProbeUtility
{
    // Set SH coefficients to MaterialPropertyBlock
    public static void SetSHCoefficients(
        Vector3 position, MaterialPropertyBlock properties
    )
    {
        SphericalHarmonicsL2 sh;
        LightProbes.GetInterpolatedProbe(position, null, out sh);

        // Constant + Linear
        for (var i = 0; i < 3; i++)
            properties.SetVector(_idSHA[i], new Vector4(
                sh[i, 3], sh[i, 1], sh[i, 2], sh[i, 0] - sh[i, 6]
            ));

        // Quadratic polynomials
        for (var i = 0; i < 3; i++)
            properties.SetVector(_idSHB[i], new Vector4(
                sh[i, 4], sh[i, 6], sh[i, 5] * 3, sh[i, 7]
            ));

        // Final quadratic polynomial
        properties.SetVector(_idSHC, new Vector4(
            sh[0, 8], sh[2, 8], sh[1, 8], 1
        ));
    }

    // Set SH coefficients to Material
    public static void SetSHCoefficients(
        Vector3 position, Material material
    )
    {
        SphericalHarmonicsL2 sh;
        LightProbes.GetInterpolatedProbe(position, null, out sh);

        // Constant + Linear
        for (var i = 0; i < 3; i++)
            material.SetVector(_idSHA[i], new Vector4(
                sh[i, 3], sh[i, 1], sh[i, 2], sh[i, 0] - sh[i, 6]
            ));

        // Quadratic polynomials
        for (var i = 0; i < 3; i++)
            material.SetVector(_idSHB[i], new Vector4(
                sh[i, 4], sh[i, 6], sh[i, 5] * 3, sh[i, 7]
            ));

        // Final quadratic polynomial
        material.SetVector(_idSHC, new Vector4(
            sh[0, 8], sh[2, 8], sh[1, 8], 1
        ));
    }

    static int[] _idSHA = {
        Shader.PropertyToID("unity_SHAr"),
        Shader.PropertyToID("unity_SHAg"),
        Shader.PropertyToID("unity_SHAb")
    };

    static int[] _idSHB = {
        Shader.PropertyToID("unity_SHBr"),
        Shader.PropertyToID("unity_SHBg"),
        Shader.PropertyToID("unity_SHBb")
    };

    static int _idSHC =
        Shader.PropertyToID("unity_SHC");
}