現実世界のオブジェクトの一つの重要な視覚的な手がかりは、それらがグレージング角(下に図示されます)でより多く反射するかに関係があります。これは、フレネルエフェクトと呼ばれます。
この例では、注意することが2つあります。第1に、これらの反射は、球体のエッジの周りに表示されます(その表面がグレージング角であるときです)。彼らはより多く見えるようになり、マテリアルのなめらかさが上がるにつれ、それらがより見えてよりシャープになります。
スタンダードシェーダーでは、フレネルエフェクトの直接制御がありません。その代わり、マテリアルの滑らかさを通して間接的に制御されます。滑らかな表面は強いフレネルを出します。まったく粗い面にはフレネルがありません。
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