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NPR-Hatching素描渲染
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Hatching（素描）渲染——通過光照的強弱，用不同深淺的紋理，實現一種類似素描效果。
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Hatching的實現原理是：通過N.L計算點受光的強弱，將該值分成不同的段，不同的光照強度對應不同深淺的素描貼圖
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算法對應的VS如下：
[cpp]?view plaincopy
VS_OUTPUT?vs_main(?VS_INPUT?Input?)??{?????VS_OUTPUT?Output;???????Output.Position?=?mul(?Input.Position,?matViewProjection?);?????Output.Texcoord?=?Input.Texcoord;??????????float3?normalW?=?mul(?Input.Normal,?matView);?????float?diffuse?=?min(?1,?max(0,?dot(?vecLightDir,?normalW)));????//把diffuse平方兩次是為了，把亮度降低點，把整體亮度向暗方向偏移，以得到更好的視覺效果。?????diffuse?=?diffuse?*?diffuse;?????diffuse?=?diffuse?*?diffuse;??????????float?factor?=?diffuse?*?6.0;??//?通過兩個weight,來記錄權值，減少傳入ps的變量數。?????float3?weight0?=?0.0;?????float3?weight1?=?0.0;???????//?不同光照強度，對應不同的權值，及不同的紋理貼圖?????if(?factor?>?5.0)?????{????????weight0.x?=?1;?????}?????else?if(?factor?>?4.0)?????{????????weight0.x?=?factor?-?4.0;????????weight0.y?=?1.0?-?weight0.x;?????}?????else?if(?factor?>?3.0)?????{????????weight0.y?=?factor?-?3.0;????????weight0.z?=?1.0?-?weight0.y;?????}?????else?if(?factor?>?2.0)?????{????????weight0.z?=?factor?-?2.0;????????weight1.x?=?1.0?-?weight0.z;?????}?????else?if(?factor?>?1.0)?????{????????weight1.x?=?factor?-?1.0;????????weight1.y?=?1.0?-?weight1.x;??????}?????else?if(?factor?>?0.0)?????{????????weight1.y?=?factor;????????weight1.z?=?1.0?-?weight1.y;?????}?????Output.Weight0?=?weight0;?????Output.Weight1?=?weight1;??????????return(?Output?);???????}??
PS為：
[c-sharp]?view plaincopy
struct?PS_INPUT??{?????float2?tex?????:?TEXCOORD0;?????float3?weight0?:?TEXCOORD1;?????float3?weight1?:?TEXCOORD2;??};????float4?ps_main(?PS_INPUT?input)?:?COLOR0??{???????float4?hattch0?=?tex2D(hattch0Map,?input.tex)*input.weight0.x;?????float4?hattch1?=?tex2D(hattch1Map,?input.tex)*input.weight0.y;?????float4?hattch2?=?tex2D(hattch2Map,?input.tex)*input.weight0.z;?????float4?hattch3?=?tex2D(hattch3Map,?input.tex)*input.weight1.x;?????float4?hattch4?=?tex2D(hattch4Map,?input.tex)*input.weight1.y;?????float4?hattch5?=?tex2D(hattch5Map,?input.tex)*input.weight1.z;??????????return?hattch0?+?hattch1?+?hattch2???????????+?hattch3?+?hattch4?+?hattch5;???????}??
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