BSDF Shader と Light Path (Roughness 変化込み)
各 BSDF シェーダがどのような成分を作るのかを視覚化するために、各 BSDF シェーダ と Light Path との関係をテストしてみました。
テストモデル
テストモデル空間の環境は以下の通りです。
- World に Light Path ノードを絡ませ、指定した Ray に反応した部分が赤くなり、そうでない部分が青くなります
- Floor (床面) は、マンセル N9.5 相当の白 (Hex:1C1C1C)
- 光源は Light Path ノードが絡んだ World のみ
テスト使用データ : BSDF_Shader_Test2.zip
いずれも Full Global Illumination プリセットで、200 Samples を GPU にてレンダリングしました。
また、粗さ (Roughness) を変更することでレイタイプの割合に変更がでてくるシェーダでは粗さを変えもテストしてみました。
Diffuse BSDF
| Roughness 0.0 | |
| 通常の World |  |
| Is Camera Ray |  |
| Is Shadow Ray |  |
| Is Diffuse Ray |  |
| Is Glossy Ray |  |
| Is Singular Ray |  |
| Is Reflection Ray |  |
| Is Transmission Ray |  |
Glossy BSDF
Glossy BSDF にある 3 つの Distribution は、それぞれで Ray の処理が異なったため、3 タイプ共テストしました。
また、Roughness を変えることでも雰囲気が変わりましたので、Roughness を 0.0、0.5、1.0 としてテストしました。
Distribution での比較
以下は、同じ Roughness で各 Distribution がどのように異なるかを比べるように並べてあります。
| Roughness 0.0 | Beckmann | GGX | Sharp |
| 通常の World |  |
 |
 |
| Is Camera Ray |  |
 |
 |
| Is Shadow Ray |  |
 |
 |
| Is Diffuse Ray |  |
 |
 |
| Is Glossy Ray |  |
 |
 |
| Is Singular Ray |  |
 |
 |
| Is Reflection Ray |  |
 |
 |
| Is Transmission Ray |  |
 |
 |
| Roughness 0.5 | Beckmann | GGX |
| 通常の World |  |
 |
| Is Camera Ray |  |
 |
| Is Shadow Ray |  |
 |
| Is Diffuse Ray |  |
 |
| Is Glossy Ray |  |
 |
| Is Singular Ray |  |
 |
| Is Reflection Ray |  |
 |
| Is Transmission Ray |  |
 |
| Roughness 1.0 | Beckmann | GGX |
| 通常の World |  |
 |
| Is Camera Ray |  |
 |
| Is Shadow Ray |  |
 |
| Is Diffuse Ray |  |
 |
| Is Glossy Ray |  |
 |
| Is Singular Ray |  |
 |
| Is Reflection Ray |  |
 |
| Is Transmission Ray |  |
 |
Roughness での比較
以下は、各 Distribution で Roughness の変化がどのように影響するかを比べるように並べてあります。
| Beckmann | Roughness 0.0 | Roughness 0.5 | Roughness 1.0 |
| 通常の World | |
|
|
| Is Camera Ray | |
|
|
| Is Shadow Ray | |
|
|
| Is Diffuse Ray | |
|
|
| Is Glossy Ray | |
|
|
| Is Singular Ray | |
|
|
| Is Reflection Ray | |
|
|
| Is Transmission Ray | |
|
|
| GGX | Roughness 0.0 | Roughness 0.5 | Roughness 1.0 |
| 通常の World | |
|
|
| Is Camera Ray | |
|
|
| Is Shadow Ray | |
|
|
| Is Diffuse Ray | |
|
|
| Is Glossy Ray | |
|
|
| Is Singular Ray | |
|
|
| Is Reflection Ray | |
|
|
| Is Transmission Ray | |
|
|
| Sharp | Roughness 0.0 |
| 通常の World | |
| Is Camera Ray | |
| Is Shadow Ray | |
| Is Diffuse Ray | |
| Is Glossy Ray | |
| Is Singular Ray | |
| Is Reflection Ray | |
| Is Transmission Ray | |
Glass BSDF
Glass BSDF にある 3 つの Distribution は、それぞれで Ray の処理が異なったため、3 タイプ共テストしました。
また、Roughness を変えることでも雰囲気が変わりましたので、Roughness を 0.0、0.5、1.0 としてテストしました。
Distribution での比較
以下は、同じ Roughness で各 Distribution がどのように異なるかを比べるように並べてあります。
| Roughness 0.0 | Beckmann | GGX | Sharp |
| 通常の World |  |
 |
 |
| Is Camera Ray |  |
 |
 |
| Is Shadow Ray |  |
 |
 |
| Is Diffuse Ray |  |
 |
 |
| Is Glass Ray |  |
 |
 |
| Is Singular Ray |  |
 |
 |
| Is Reflection Ray |  |
 |
 |
| Is Transmission Ray |  |
 |
 |
| Roughness 0.5 | Beckmann | GGX |
| 通常の World |  |
 |
| Is Camera Ray |  |
 |
| Is Shadow Ray |  |
 |
| Is Diffuse Ray |  |
 |
| Is Glass Ray |  |
 |
| Is Singular Ray |  |
 |
| Is Reflection Ray |  |
 |
| Is Transmission Ray |  |
 |
| Roughness 1.0 | Beckmann | GGX |
| 通常の World |  |
 |
| Is Camera Ray |  |
 |
| Is Shadow Ray |  |
 |
| Is Diffuse Ray |  |
 |
| Is Glass Ray |  |
 |
| Is Singular Ray |  |
 |
| Is Reflection Ray |  |
 |
| Is Transmission Ray |  |
 |
Roughness での比較
以下は、各 Distribution で Roughness の変化がどのように影響するかを比べるように並べてあります。
| Beckmann | Roughness 0.0 | Roughness 0.5 | Roughness 1.0 |
| 通常の World | |
|
|
| Is Camera Ray | |
|
|
| Is Shadow Ray | |
|
|
| Is Diffuse Ray | |
|
|
| Is Glass Ray | |
|
|
| Is Singular Ray | |
|
|
| Is Reflection Ray | |
|
|
| Is Transmission Ray | |
|
|
| GGX | Roughness 0.0 | Roughness 0.5 | Roughness 1.0 |
| 通常の World | |
|
|
| Is Camera Ray | |
|
|
| Is Shadow Ray | |
|
|
| Is Diffuse Ray | |
|
|
| Is Glass Ray | |
|
|
| Is Singular Ray | |
|
|
| Is Reflection Ray | |
|
|
| Is Transmission Ray | |
|
|
| Sharp | Roughness 0.0 |
| 通常の World | |
| Is Camera Ray | |
| Is Shadow Ray | |
| Is Diffuse Ray | |
| Is Glass Ray | |
| Is Singular Ray | |
| Is Reflection Ray | |
| Is Transmission Ray | |
Translucent BSDF
| Hex:F7F7F7 | |
| 通常の World |  |
| Is Camera Ray |  |
| Is Shadow Ray |  |
| Is Diffuse Ray |  |
| Is Glossy Ray |  |
| Is Singular Ray |  |
| Is Reflection Ray |  |
| Is Transmission Ray |  |
Transparent BSDF
| Hex:F7F7F7 | |
| 通常の World |  |
| Is Camera Ray |  |
| Is Shadow Ray |  |
| Is Diffuse Ray |  |
| Is Glossy Ray |  |
| Is Singular Ray |  |
| Is Reflection Ray |  |
| Is Transmission Ray |  |
Velvet BSDF
| Sigma 1.0 | |
| 通常の World |  |
| Is Camera Ray |  |
| Is Shadow Ray |  |
| Is Diffuse Ray |  |
| Is Glossy Ray |  |
| Is Singular Ray |  |
| Is Reflection Ray |  |
| Is Transmission Ray |  |
- 最終更新:2012-02-09 14:07:49
