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CloseSpecular convolution (aka Prefiltered Environment Map).
Each pixel of this Cubemap texture is replaced with the integral of incident illumination towards corresponding direction weighted with the Phong lobe. Each mip map is convolved with varying Phong exponent - high resolution mip maps represent glossy reflection while low resolution mips are very blurry and useful for very rough specular reflection.
Can be used to reflect light on glossy and rough objects by sampling with the reflection vector.
See Also: TextureImporterSettings.cubemapConvolution.