Fresnel Effect ノード
説明
フレネル効果 (Fresnel Effect) は、見る角度によってサーフェス (表面) 上の反射率が変わる効果で、グレージング角に近付くほど多くの光が反射されます。Fresnel Effect ノードは、面法線とビュー方向の間の角を計算することで、この近似値を導き出します。この角が広いほど返り値が大きくなります。このエフェクトは、様々な技巧で一般的に見られる "リムライティング" の作成に頻繁に使用されます。
ポート
Name |
Direction |
タイプ |
説明 |
Normal |
入力 |
Vector 3 |
法線の方向です。デフォルトでワールド空間法線に紐づけられています。 |
View Dir |
入力 |
Vector 3 |
ビュー方向です。デフォルトでワールド空間法線に紐づけられています。 |
Power |
入力 |
Vector 1 |
累乗の計算の指数 |
Out |
出力 |
Vector 1 |
出力値 |
生成されるコードの例
以下のサンプルコードは、このノードの出力の一例を示したものです。
void Unity_FresnelEffect_float(float3 Normal, float3 ViewDir, float Power, out float Out)
{
Out = pow((1.0 - saturate(dot(normalize(Normal), normalize(ViewDir)))), Power);
}
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