Volume Scatter(ボリュームの散乱)¶

Volume Scatter (ボリュームの散乱)ノードは、ボリュームを通過する際に光を散乱します。一般的な使用法は、シーンに霧を追加することです。また、 Volume Absorption ノードと共に使用して煙を作成できます。

入力¶

Color(カラー): Scattering coefficients per color channel.
Density(密度): 散乱効果の密度。
Anisotropy Henyey-Greenstein Draine: Controls the relative amount of backward and forward scattering.
IOR Fournier-Forand: Refractive index of the scattering particles relative to water. Common ocean waters range between 1.0 and 1.2, while turbid waters with higher density of particles have higher IORs.
Backscatter Fournier-Forand: Fraction of light that is scattered backwards. Most oceanic particles have backscatter values between 0.001 (e.g., very large phytoplankton) and 0.1 (e.g., very small mineral particles), pure water has a backscatter of 0.5. Values taken from Ocean Optics Web Book.
Alpha Draine: Blending factor between Henyey-Greenstein (\(\alpha = 0\)) and Cornette & Shanks (\(\alpha = 1\)) phase functions.
Diameter Mie: Diameter of the scattering particles in µm.

Phase(位相)

Volume scattering phase function.

Henyey-Greenstein:: Simple and widely used phase function, useful for approximating scattering in biological tissues.
Fournier-Forand:: Cycles Only Suitable for modeling the scattering of light in underwater environments.
Draine:: Cycles Only Suitable for modeling the scattering of interstellar dust.
Rayleigh:: Cycles Only Describes the scattering by particles with a size smaller than the wavelength of light, such as the scattering of sunlight in earth's atmosphere.
Mie:: Cycles Only Describes the scattering by particles with a size larger than the wavelength of light, such as cloud and fog.

Tip

These phase functions can be combined using a Mix Shader (シェーダーミックス).

Volume(ボリューム): Volumeシェーダー出力は、Material または World 出力ノードの Volume Input に接続する必要があります。