{"id":2946,"date":"2021-04-30T22:11:00","date_gmt":"2021-04-30T14:11:00","guid":{"rendered":"https:\/\/www.yumefx.com\/?p=2946"},"modified":"2022-02-10T11:02:59","modified_gmt":"2022-02-10T03:02:59","slug":"%e7%bb%8f%e5%85%b8%e5%85%89%e7%85%a7%e6%a8%a1%e5%9e%8b%e4%b9%8bphong%e4%ba%8eblinn","status":"publish","type":"post","link":"https:\/\/www.yumefx.com\/?p=2946","title":{"rendered":"\u5149\u7167\u6a21\u578b\u57fa\u7840\u4e4bPhong\u4e0eBlinn-Phong"},"content":{"rendered":"\n

\u524d\u8a00<\/h1>\n

\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\u8bf4\u8fc7Lambert\u5149\u7167\u6a21\u578b\u7684\u539f\u7406\u548c\u5b9e\u73b0\u65b9\u5f0f\uff0cLambert\u53ea\u80fd\u6a21\u62df\u7c97\u7cd9\u5e73\u9762\u7684\u6f2b\u53cd\u5c04\u73b0\u8c61\uff0c\u6ca1\u6cd5\u6a21\u62df\u5149\u6ed1\u5e73\u9762\u7684\u9ad8\u5149\u53cd\u5c04\u3002<\/p>\n

\u60f3\u8981\u6a21\u62df\u9ad8\u5149\u53cd\u5c04\u5c31\u4e0d\u5f97\u4e0d\u63d0\u7ecf\u5178\u7684Phong\u5149\u7167\u6a21\u578b\uff0c\u5728Lambert\u6f2b\u53cd\u5c04\u6a21\u578b\u7684\u57fa\u7840\u4e0a\uff0c\u589e\u52a0\u4e86\u6a21\u62df\u9ad8\u5149\u53cd\u5c04\u7684\u7b97\u6cd5\uff0c\u518d\u53e0\u52a0\u4e0a\u73af\u5883\u5149\u548c\u81ea\u53d1\u5149\uff0c\u53ef\u4ee5\u6bd4\u8f83\u771f\u5b9e\u5730\u6a21\u62df\u5e38\u89c1\u7684\u5149\u7167\u6548\u679c\u3002<\/p>\n

\u540e\u6765\u53c8\u51fa\u73b0\u4e86Blinn-Phong\u7684\u5149\u7167\u6a21\u578b\uff0c\u4e0ePhong\u7684\u533a\u522b\u5c31\u662f\u5bf9\u9ad8\u5149\u53cd\u5c04\u7684\u8ba1\u7b97\u65b9\u5f0f\u8fdb\u884c\u4e86\u4e00\u5b9a\u4f18\u5316\u3002<\/p>\n

\u56e0\u6b64\u672c\u6587\u5c31\u4ecb\u7ecd\u4e00\u4e0b\u8fd9\u4e24\u79cd\u5149\u7167\u6a21\u578b\u4e2d\u9ad8\u5149\u53cd\u5c04\u90e8\u5206\u7684\u8ba1\u7b97\u539f\u7406\u4ee5\u53ca\u5728Unity\u548cUE4\u4e2d\u6a21\u62df\u5b9e\u73b0\u7684\u65b9\u6cd5\u3002<\/p>\n

\u00a0<\/h1>\n

\u9ad8\u5149\u539f\u7406<\/h1>\n

\u9996\u5148\u8bf7\u770b\u4e0b\u56fe\uff0c\u8054\u60f3\u4e00\u4e0b\u7528\u955c\u5b50\u53cd\u5c04\u9633\u5149\u6216\u8005\u706f\u5149\u7684\u65f6\u5019\uff0c\u9ad8\u5149\u4eae\u5ea6\u662f\u4e0e\u89c2\u5bdf\u89d2\u5ea6\u6709\u5173\u7684\uff0c\u5f53\u4ece\u5149\u7ebf\u53cd\u5c04\u65b9\u5411\u89c2\u5bdf\u65f6\u9ad8\u5149\u4eae\u5ea6\u6700\u5927\uff0c\u8fd9\u5c31\u662fPhong\u5149\u7167\u6a21\u578b\u7684\u6280\u672f\u539f\u7406\u3002<\/p>\n

\"\"<\/p>\n

\u800c\u9ad8\u5149\u5f3a\u5ea6\u7684\u8ba1\u7b97\u65b9\u5f0f\u6b63\u662f\u901a\u8fc7\u6c42\u5149\u7ebf\u53cd\u5c04\u65b9\u5411rDir<\/strong>\u548c\u89c2\u5bdf\u65b9\u5411vDir<\/strong>\u7684\u70b9\u79ef\u5f97\u5230\uff0c\u5373dot(rDir, vDir)<\/strong>\u3002<\/p>\n

\u53e6\u5916\u4e00\u79cd\u8ba1\u7b97\u65b9\u5f0f\u5219\u662f\u901a\u8fc7\u6c42\u5149\u7ebf\u53cd\u65b9\u5411lDir<\/strong>\u548c\u89c2\u5bdf\u53cd\u5c04\u65b9\u5411vrDir<\/strong>\u7684\u70b9\u79ef\u5f97\u5230\uff0c\u5373dot(lDir, vrDir)<\/strong>\u3002\u8fd9\u79cd\u8ba1\u7b97\u65b9\u5f0f\u53ef\u4ee5\u901a\u8fc7\u4e0b\u56fe\u7406\u89e3\u3002<\/p>\n

\"\"<\/p>\n

\u800cBlinn-Phong\u5149\u7167\u6a21\u578b\u7684\u9ad8\u5149\u4eae\u5ea6\u8ba1\u7b97\u65b9\u5f0f\u5219\u662f\u901a\u8fc7\u8ba1\u7b97\u6cd5\u7ebf\u65b9\u5411nDir<\/strong>\u548c\u534a\u89d2\u65b9\u5411hDir<\/strong>\uff08\u5149\u7167\u65b9\u5411lDIr\u4e0e\u89c2\u5bdf\u65b9\u5411vDir\u7684\u4e2d\u95f4\u89d2\uff09\u7684\u70b9\u79ef\u5f97\u5230\uff0c\u5373dot(nDir,hDir)<\/strong>\u3002<\/p>\n

Blinn-Phong\u5149\u7167\u6a21\u578b\u662f\u5728Phong\u4e0a\u7684\u7b80\u5316\uff0c\u80dc\u5728\u591a\u6570\u60c5\u51b5\u4e0b\u8ba1\u7b97\u901f\u5ea6\u5feb\u6548\u679c\u4e5f\u4e0d\u9519\uff0c\u56e0\u6b64\u5728\u65e9\u671f\u8ba1\u7b97\u673a\u6027\u80fd\u4e0d\u591f\u7684\u65f6\u5019\u88ab\u5927\u91cf\u4f7f\u7528\uff0c\u800c\u5982\u4eca\u5df2\u7ecf\u53ef\u4ee5\u81ea\u7531\u9009\u62e9\u4e0d\u540c\u6a21\u578b\u8fdb\u884c\u9ad8\u5149\u8ba1\u7b97\u4e86\u3002<\/p>\n

\u00a0<\/h1>\n

\u5728Unity\u4e2d\u6a21\u62dfPhong\u4ee5\u53caBlinn-Phong\u7684\u9ad8\u5149\u53cd\u5c04<\/h1>\n

phong\u7684\u9ad8\u5149\u53cd\u5c04\u53ef\u901a\u8fc7\u4ee5\u4e0b\u8282\u70b9\u8fde\u63a5\u8fdb\u884c\u6a21\u62df\u3002<\/p>\n

\"\"<\/p>\n

\u5176\u4e2dPower\u8282\u70b9\u4e3an\u6b21\u5e42\u8282\u70b9\uff0cn\u8d8a\u5927\uff0c\u4f1a\u5bfc\u81f4\u9ad8\u5149\u8303\u56f4\u8d8a\u5c0f\u3002<\/p>\n

Blinn-Phong\u7684\u9ad8\u5149\u53cd\u5c04\u5219\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\u3002<\/p>\n

\"\"<\/p>\n

\u00a0<\/h1>\n

\u5728UE4\u4e2d\u6a21\u62dfPhong\u4ee5\u53caBlinn-Phong\u7684\u9ad8\u5149\u53cd\u5c04<\/h1>\n

\u5728UE4\u4e2d\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u6a21\u62dfPhong\u7684\u9ad8\u5149\u53cd\u5c04<\/p>\n

\"\"<\/p>\n

\u5176\u4e2d\u5149\u7ebf\u53cd\u5c04rDir\u7684\u6c42\u8bc1\u65b9\u5f0f\u6bd4\u8f83\u590d\u6742\uff0c\u53c2\u8003\u4e0b\u56fe\uff0c\u5176\u4e2dao\u4e3a\u5149\u7ebf\u65b9\u5411\uff0c\u6c42\u5149\u7ebf\u53cd\u5c04ob\u53ef\u4ee5\u8f6c\u5316\u6210ab-ao\uff0c\u8fdb\u800c2ap-ao\uff0c\u518d\u8f6c\u5316\u6210 2(ao+op)-ao\uff0c\u4e5f\u5c31\u662fao+2op\uff0c\u800c\u524d\u6587\u8bf4\u8fc7\u70b9\u79ef\u7684\u6570\u5b66\u610f\u4e49\u5373\u662fcos\u4f59\u5f26\u503c\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7oa\u548c\u6cd5\u7ebfon\u7684\u70b9\u79ef\u5f97\u5230op\uff0c\u5177\u4f53\u8fc7\u7a0b\u53ef\u53c2\u8003\u51e0\u4f55\u5411\u91cf\uff1a\u8ba1\u7b97\u5149\u7ebf\u53cd\u5c04reflect\u5411\u91cf<\/a>\u3002<\/p>\n

\"\"<\/p>\n

\u800cBlinn-Phong\u5149\u7167\u6a21\u578b\u7684\u9ad8\u5149\u5219\u5982\u4e0b\uff1a<\/p>\n

\"\"<\/p>\n

\u00a0<\/h1>\n

\u5728Unity\u4e2d\u901a\u8fc7\u4ee3\u7801\u5b9e\u73b0Phong\u548cBlinn-Phong<\/h1>\n

\u4ee3\u7801\u5982\u4e0b\uff0c\u4e0d\u53ea\u662f\u9ad8\u5149\u53cd\u5c04\u90e8\u5206\u7684\u4ee3\u7801\uff0c\u8fd8\u4e0eLambert\u6574\u5408\u5728\u4e00\u8d77\uff0c\u6700\u7ec8\u8f93\u51fa\u7684\u662f\u62e5\u6709\u6f2b\u53cd\u5c04\u548c\u9ad8\u5149\u53cd\u5c04\uff0c\u5e76\u4e14\u80fd\u53cd\u5e94\u706f\u5149\u989c\u8272\u7684\u7b80\u6613shader\u3002<\/p>\n

\u5982\u679c\u518d\u52a0\u4e0a\u81ea\u53d1\u5149\u548c\u73af\u5883\u5149\u7684\u8bdd\u5c31\u662f\u5b8c\u6574\u7684Phong\u548cBlinn-Phong\u5149\u7167\u6a21\u578b\u4e86\u3002<\/p>\n\n\n\n

\/\/ shader\u7684\u8def\u5f84\u548c\u540d\u79f0<\/span>\nShader \"Shader Forge\/phong\" {<\/span>\n    \/\/ \u81ea\u5b9a\u4e49\u66b4\u9732\u5230\u63a7\u5236\u9762\u677f\u7684\u5c5e\u6027<\/span>\n    Properties {<\/span>\n        _BaseColor (\"Base Color\", color) = (0.7, 0.4, 0.4, 1.0)<\/span>\n        _SpecularPow (\"Specular Power\", range(1,90)) = 30<\/span>\n    }<\/span>\n    SubShader {<\/span>\n        Tags {<\/span>\n            \"RenderType\"=\"Opaque\"<\/span>\n        }<\/span>\n        Pass {<\/span>\n            Name \"FORWARD\"<\/span>\n            Tags {<\/span>\n                \"LightMode\"=\"ForwardBase\"<\/span>\n            }<\/span>\n            <\/span>\n            CGPROGRAM<\/span>\n            #pragma vertex vert<\/span>\n            #pragma fragment frag<\/span>\n            #include \"UnityCG.cginc\"<\/span>\n            #pragma multi_compile_fwdbase_fullshadows<\/span>\n            #pragma target 3.0<\/span>\n            <\/span>\n            \/\/ \u58f0\u660e\u53d8\u91cf<\/span>\n            uniform float4 _LightColor0;<\/span>\n            uniform float3 _BaseColor;<\/span>\n            uniform float _SpecularPow;<\/span>\n            <\/span>\n            \/\/ \u8f93\u5165\u7ed3\u6784<\/span>\n            struct VertexInput {<\/span>\n                \/\/ \u8f93\u5165\u9876\u70b9\u7684\u7269\u4f53\u7a7a\u95f4\u4f4d\u7f6e<\/span>\n                float4 vertex : POSITION;<\/span>\n                \/\/ \u8f93\u5165\u7269\u4f53\u7a7a\u95f4\u6cd5\u7ebf<\/span>\n                float3 normal : NORMAL;<\/span>\n            };<\/span>\n            <\/span>\n            \/\/ \u8f93\u51fa\u7ed3\u6784<\/span>\n            struct VertexOutput {<\/span>\n                \/\/ \u8f93\u51fa\u9876\u70b9\u7684\u88c1\u526a\u7a7a\u95f4\u4f4d\u7f6e<\/span>\n                float4 posCS : SV_POSITION;<\/span>\n                \/\/ \u8f93\u51fa\u9876\u70b9\u7684\u4e16\u754c\u7a7a\u95f4\u4f4d\u7f6e<\/span>\n                float3 posWS : TEXCOORD0;<\/span>\n                \/\/ \u8f93\u51fa\u6cd5\u7ebf\u7684\u4e16\u754c\u7a7a\u95f4\u65b9\u5411<\/span>\n                float3 nDirWS : TEXCOORD1;<\/span>\n            };<\/span>\n            <\/span>\n            \/\/ \u9876\u70b9shader<\/span>\n            VertexOutput vert (VertexInput v) {<\/span>\n                VertexOutput o = (VertexOutput)0;<\/span>\n                \/\/ \u8ba1\u7b97\u6cd5\u7ebf\u7684\u4e16\u754c\u7a7a\u95f4\u65b9\u5411<\/span>\n                o.nDirWS = UnityObjectToWorldNormal(v.normal);<\/span>\n                \/\/ \u8ba1\u7b97\u9876\u70b9\u7684\u88c1\u526a\u7a7a\u95f4\u4f4d\u7f6e<\/span>\n                o.posCS = UnityObjectToClipPos( v.vertex );<\/span>\n                \/\/ \u8ba1\u7b97\u9876\u70b9\u7684\u4e16\u754c\u7a7a\u95f4\u4f4d\u7f6e<\/span>\n                o.posWS = mul(unity_ObjectToWorld, v.vertex);<\/span>\n                return o;<\/span>\n            }<\/span>\n            <\/span>\n            \/\/ \u50cf\u7d20shader<\/span>\n            float4 frag(VertexOutput i) : COLOR {<\/span>\n                \/\/ \u51c6\u5907\u5411\u91cf<\/span>\n                float3 nDirWS = i.nDirWS;<\/span>\n                float3 lDirWS = normalize(_WorldSpaceLightPos0.xyz);<\/span>\n                float3 vDirWS = normalize(_WorldSpaceCameraPos.xyz - i.posWS.xyz);<\/span>\n                float3 hDirWS = normalize(vDirWS + lDirWS);<\/span>\n                \/\/ float3 rDirWS = reflect(-lDirWS,nDirWS);  \/\/ phong\u6a21\u578b\u6240\u9700\u7684\u5149\u7ebf\u53cd\u5c04\u65b9\u5411<\/span>\n                <\/span>\n                \/\/ \u8ba1\u7b97\u70b9\u79ef<\/span>\n                float nDotl = dot(nDirWS, lDirWS);<\/span>\n                float nDoth = dot(nDirWS, hDirWS);<\/span>\n                \/\/ float vDotr = dot(vDirWS, rDirWS);  \/\/ phong\u6a21\u578b\u6240\u9700\u7684\u70b9\u79ef<\/span>\n                <\/span>\n                \/\/ \u5149\u7167\u6a21\u578b<\/span>\n                float LambertIntensity = max(0.0,nDotl);<\/span>\n                float BlinnPhongIntensity = pow(max(0.0, nDoth), _SpecularPow);<\/span>\n                \/\/ float PhongIntensity = pow(max(0.0, vDotr), _SpecularPow);  \/\/ phong\u6a21\u578b\u7684\u4eae\u5ea6<\/span>\n                float3 FinalRGB = _BaseColor.rgb * LambertIntensity * _LightColor0.rgb + BlinnPhongIntensity * _LightColor0.rgb;<\/span>\n   <\/span>\n                return float4(FinalRGB, 1.0);<\/span>\n            }<\/span>\n            ENDCG<\/span>\n        }<\/span>\n    }<\/span>\n    FallBack \"Diffuse\"<\/span>\n}<\/span>\n<\/pre>\n\n\n\n
\u672c\u6587\u540c\u6837\u53c2\u8003\u81eaB\u7ad9\u5e84\u61c2\u7684\u6280\u672f\u7f8e\u672f\u5165\u95e8\u8bfe<\/a>\uff0c\u611f\u8c22\u3002<\/p>\n
 <\/p>\n\n\n\n
\n\n\n\n
\u6211\u4eec\u7684\u5c0a\u4e25\u4e0d\u503c\u4ec0\u4e48\u94b1\uff0c
\u53ef\u5b83\u662f\u552f\u4e00\u6211\u4eec\u771f\u6b63\u62e5\u6709\u7684\u4e1c\u897f\uff0c
\u662f\u6211\u4eec\u6700\u540e\u4e00\u5bf8\u9886\u571f\uff0c
\u4f46\u5728\u90a3\u4e00\u5bf8\u9886\u571f\u91cc\uff0c
\u6211\u4eec\u662f\u81ea\u7531\u7684\u3002<\/p>\n
\u2014\u2014\u300aV\u5b57\u4ec7\u6740\u961f\u300b<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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