{"id":1307,"date":"2022-06-29T21:04:44","date_gmt":"2022-06-29T13:04:44","guid":{"rendered":"https:\/\/www.mapleriver.cn\/?p=1307"},"modified":"2022-06-30T12:58:42","modified_gmt":"2022-06-30T04:58:42","slug":"shadertoy%e7%94%bb%e7%82%b9%e5%92%8c%e7%ba%bf","status":"publish","type":"post","link":"https:\/\/www.mapleriver.cn\/?p=1307","title":{"rendered":"ShaderToy\u753b\u70b9\u548c\u7ebf"},"content":{"rendered":"
1.\u5728\u54ea\u91cc\u753b<\/h5>\n

 \u00a0 \u5728\u5f00\u59cb\u5b66\u753b\u70b9\u548c\u7ebf\u4e4b\u524d\uff0c\u6211\u4eec\u8981\u5148\u60f3\u4e00\u60f3\uff0c\u6211\u4eec\u7684\u70b9\u8981\u753b\u5728\u5c4f\u5e55\u4e0a\u7684\u54ea\u91cc\uff1f\u6211\u4eec\u8be5\u5982\u4f55\u63cf\u8ff0\u5c4f\u5e55\u4e0a\u7684\u4f4d\u7f6e\uff1f
\n \u00a0 \u5728\u4e0a\u4e00\u7bc7\u57fa\u7840<\/a>\u4e2d\uff0c\u6211\u4eec\u4ece\u4e50\u4e50\u5927\u4f6c\u6284\u5230\u4e86\u4e00\u4e2a\u6a21\u677f\uff0c\u5176\u4e2d\u7684\u9876\u70b9\/\u7247\u5143\u7740\u8272\u5668\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n

\/\/\u9876\u70b9\u7740\u8272\u5668\nv2f vert(appdata_base v) {\u00a0\u00a0\n    v2f o;\n    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);\n    o.scrPos = ComputeScreenPos(o.pos);\n    return o;\n}\u00a0\u00a0\n\/\/\u7247\u5143\u7740\u8272\u5668\nfixed4 frag(v2f _iParam) : COLOR0 {\n    vec2 fragCoord = gl_FragCoord;\n    return main(gl_FragCoord);\n}\u00a0\u00a0\n<\/code><\/pre>\n
 \u00a0 \u5176\u4e2d\u9876\u70b9\u7740\u8272\u5668\u6ca1\u4ec0\u4e48\u597d\u8bf4\u7684\uff0c\u5c31\u662f\u628a\u6a21\u578b\u5750\u6807\u8f6c\u6362\u4e3a\u5c4f\u5e55\u5750\u6807\u3002
\n \u00a0 \u800c\u7247\u5143\u7740\u8272\u5668\u4e2d\u7684gl_FragCoord\u5219\u662f\u6a21\u677f\u4e2d\u5728\u4e0a\u65b9\u5b9a\u4e49\u7684GLSL\u7684\u53d8\u91cf\uff1a<\/p>\n
\/\/ \u5c4f\u5e55\u7684\u5c3a\u5bf8\n#define iResolution _ScreenParams\n\/\/ \u5c4f\u5e55\u4e2d\u7684\u5750\u6807\uff0c\u4ee5pixel\u4e3a\u5355\u4f4d\n#define gl_FragCoord ((_iParam.srcPos.xy\/_iParam.srcPos.w)*_ScreenParams.xy)<\/code><\/pre>\n
 \u00a0 \u5176\u4e2d_ScreenParams\u662fUnity\u5185\u7f6e\u7684\u5c4f\u5e55\u5750\u6807\u53c2\u6570\uff0c\u7b2c\u4e00\u6761\u5b9a\u4e49\u53ea\u662f\u628a\u5b83\u6362\u4e86\u4e2a\u540d\u5b57\u800c\u5df2\u3002
\n \u00a0 \u7b2c\u4e8c\u6761\u5b9a\u4e49\u4e2d\u7684 (_iParam.srcPos.xy\/_iParam.srcPos.w)<\/strong> \u662f\u4e3a\u4e86 \u5f97\u5230\u5728\u5c4f\u5e55\u4e2d\u5f52\u4e00\u5316\u540e\u7684\u5c4f\u5e55\u4f4d\u7f6e<\/strong> \uff0c\u5373\u8fd4\u56de\u8303\u56f4\u5728\uff080,1\uff09\u5c4f\u5e55\u6a2a\u7eb5\u5750\u6807\u503c\u3002\u5c4f\u5e55\u7684\u5de6\u4e0b\u89d2\u503c\u4e3a\uff080,0\uff09\uff0c\u53f3\u4e0a\u89d2\u503c\u4e3a\uff081,1\uff09<\/strong>\u3002\u7136\u540e\u518d\u4e58\u4ee5\u5c4f\u5e55\u7684\u957f\u5bbd\u50cf\u7d20\u503c\uff0c\u5c31\u5f97\u5230\u4e86\u8fd9\u4e2a\u7247\u5143\u5bf9\u5e94\u7684\u5c4f\u5e55\u50cf\u7d20\u4f4d\u7f6e\u3002
\n \u00a0 \u51e0\u79cd\u5e38\u89c1\u7684\u4f4d\u7f6e\u8ba1\u7b97\uff1a<\/p>\n
vec4 main(vec2 fragCoord) {\n        vec2 pos = fragCoord; \/\/ pos.x ~ (0, iResolution.x), pos.y ~ (0, iResolution.y)\n        vec2 pos = fragCoord.xy \/ iResolution.xy; \/\/ pos.x ~ (0, 1), pos.y ~ (0, 1)\n        vec2 pos = fragCoord \/ min(iResolution.x, iResolution.y); \/\/ If iResolution.x > iResolution.y, pos.x ~ (0, 1.xx), pos.y ~ (0, 1)\n        vec2 pos =fragCoord.xy \/ iResolution.xy * 2. - 1.; \/\/ pos.x ~ (-1, 1), pos.y ~ (-1, 1)\n        vec2 pos = (2.0*fragCoord.xy-iResolution.xy)\/min(iResolution.x,iResolution.y);  \/\/ If iResolution.x > iResolution.y, pos.x ~ (-1.xx, 1.xx), pos.y ~ (-1, 1)\n\n        return vec4(1);\n    }<\/code><\/pre>\n
\"\"<\/a>
\n \u00a0 \u5176\u4e2d\u540e\u9762\u4e24\u79cd\u8ba1\u7b97\u662f\u5c06\u4f4d\u7f6e\u6620\u5c04\u5230\u4e86\uff08-1,1\uff09\u7684\u8303\u56f4\uff0c\u8fd9\u6837\u66f4\u65b9\u4fbf\u8ba1\u7b97\u3002<\/p>\n
2.\u753b\u7b2c\u4e00\u4e2a\u70b9\uff08\u5706\uff09<\/h5>\n
 \u00a0 \u5728shader\u4e2d\uff0c\u4e00\u4e2a\u70b9\u5176\u5b9e\u4e5f\u5c31\u662f\u4e00\u4e2a\u5706\u5f62\uff0c\u90a3\u4e48\u5706\u5f62\u4f5c\u4e3a\u4e00\u4e2a\u57fa\u7840\u56fe\u5f62\u8ba1\u7b97\u8d77\u6765\u4e5f\u4e0d\u662f\u5f88\u96be\u3002\u9996\u5148\u6211\u4eec\u5728properties\u91cc\u5b9a\u4e49\u4e24\u4e2a\u53c2\u6570\uff0c_Parameters\u548c_Color\u5206\u522b\u7528\u6765\u63cf\u8ff0\u6211\u4eec\u7684\u5706\u5fc3\u5750\u6807\uff0c\u5706\u534a\u5f84\u548c\u989c\u8272<\/p>\n
Properties{\n    _Parameters ("Circle Parameters", Vector) = (0.5, 0.5, 10, 0) \/\/ Center: (x, y), Radius: z\n    _Color ("Circle Color", Color) = (1, 1, 1, 1)\n}<\/code><\/pre>\n
 \u00a0 \u7136\u540e\u5728\u52a0\u5165\u4e00\u4e2a\u5c0f\u5c0f\u7684\u5706\u5f62\u7b97\u6cd5\uff1a<\/p>\n
vec4 circle(vec2 pos, vec2 center, float radius, float4 color) {\n    if (length(pos - center) < radius) {\n        \/\/ In the circle\n        return vec4(1, 1, 1, 1) * color;\n    } else {\n        return vec4(0, 0, 0, 1);\n    }\n}<\/code><\/pre>\n
 \u00a0 \u51fd\u6570\u4e5f\u5f88\u7b80\u5355\uff0c\u4f20\u5165\u4e00\u4e2a\u5750\u6807\u70b9pos\uff0c\u4e00\u4e2a\u5706\u5f62\u7684\u4e2d\u70b9center\uff0c\u534a\u5f84radius\u4ee5\u53ca\u989c\u8272color\uff0c\u8ba1\u7b97\u5750\u6807\u70b9\u4e0e\u4e2d\u5fc3\u70b9\u7684\u8ddd\u79bb\uff0c\u5982\u679c\u5728\u5706\u5185\u8fd4\u56de\u989c\u8272\u503c\uff0c\u5706\u5916\u8fd4\u56de\u9ed1\u8272\u3002
\n \u00a0 \u63a5\u4e0b\u6765\u53ea\u8981\u5728main\u51fd\u6570\u5185\u8c03\u7528\u4e00\u4e0b\u8fd9\u4e2a\u51fd\u6570\u5c31\u53ef\u4ee5\u4e86\uff1a<\/p>\n
vec4 main(vec2 fragCoord) {\n    return circle(fragCoord, _Parameters.xy * iResolution.xy, _Parameters.z, _Color);\n}<\/code><\/pre>\n
 \u00a0 \u63a5\u4e0b\u6765\u53ea\u8981\u7a0d\u5fae\u8c03\u4e00\u8c03\u5750\u6807\u5c31\u53ef\u4ee5\u5f97\u5230\u8fd9\u6837\u7684\u6548\u679c\uff08_Parameters\uff080.5,0.5,100\uff09\uff09\uff1a
\n\"\"<\/a>
\n \u00a0 \u7136\u540e\u6211\u8fd8\u53d1\u73b0\u4e86\u4e00\u4e2a\u597d\u73a9\u7684\u73b0\u8c61\uff0c\u6211\u5e73\u65f6\u5f00\u53d1\u6bd4\u8f83\u4e60\u60ef\u4f7f\u75282by3\u683c\u5f0f\u7684\u5e03\u5c40\uff0c\u8fd9\u6837\u53ef\u4ee5\u540c\u65f6\u770b\u5230game\u7a97\u53e3\u4e0escene\u7a97\u53e3\uff0c\u800cShaderToy\u662f\u57fa\u4e8e\u5c4f\u5e55\u7ed8\u5236\u7684\uff0c\u6211\u5728Unity\u91cc\u662f\u901a\u8fc7\u4e00\u4e2a\u5168\u5c4f\u7684\u9762\u677f\u6765\u6a21\u62df\u5c4f\u5e55\u7ed8\u5236\u7684\uff0c\u4f46\u662f\u5728game\u7684\u5168\u5c4f\u5f88\u660e\u663e\u4e0d\u662fscene\u7684\u5168\u5c4f\uff0c\u4e8e\u662f\u5c31\u6709\u4e86\u8fd9\u6837\u7684\u6548\u679c\uff1a
\n
\"\"\"\"
 
GIF<\/div> <\/div> <\/div>
\n \u00a0 \u5f88\u660e\u663e\uff0c\u5bf9\u4e8egame\u548cscene\u7a97\u53e3\uff0c\u4ed6\u4eec\u6709\u5404\u81ea\u7684\u8303\u56f4\u4e0e\u5c3a\u5ea6\uff08\u540c\u6837\u662f100\u534a\u5f84\uff0c\u4f46\u662f\u5728\u4e24\u4e2a\u7a97\u53e3\u7684\u5927\u5c0f\u5b8c\u5168\u4e0d\u4e00\u6837\uff0c\u56e0\u4e3agame\u6211\u9501\u4e861920*1080\u7684\u5206\u8fa8\u7387\uff09<\/p>\n
P.S.\u5706\u7684\u6297\u952f\u9f7f<\/strong><\/h6>\n
 \u00a0 Shader\u4e2d\u6297\u952f\u9f7f\u7684\u539f\u7406\u5927\u6982\u662f\u8fd9\u6837\uff1a\u7531\u4e8e\u539f\u6765\u975eA\u5373B\u7684\u8ba1\u7b97\u4f1a\u4f7f\u5f97A\u548cB\u7684\u4ea4\u754c\u5904\u4ea7\u751f\u952f\u9f7f\uff08\u4f8b\u5982\u4e0a\u9762\u5706\u7684\u8fb9\u754c\uff09\uff0c\u56e0\u6b64\u6211\u4eec\u53ea\u9700\u8981\u5728A\u548cB\u7684\u8fb9\u754c\u5e73\u7f13\u8fc7\u6e21\u5373\u53ef\u3002\u8fd9\u5f80\u5f80\u9700\u8981\u900f\u660e\u5ea6\u7684\u914d\u5408\uff0c\u5373\u4f7f\u7528\u900f\u660e\u5ea6\u6765\u6df7\u5408\u989c\u8272\u3002
\n \u00a0 \u5728shader\u4e2d\uff0c\u4e00\u79cd\u5e38\u89c1\u7684\u6297\u952f\u9f7f\uff08\u5e73\u6ed1\uff09\u64cd\u4f5c\u662f\u4f7f\u7528smoothstep\u51fd\u6570\u3002smoothstep\u51fd\u6570\u5728CG\u6587\u6863\u91cc\u9762\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
\nsmoothstep(a,b,x)\nInterpolates smoothly from 0 to 1 based on x compared to a and b.\n\n1) Returns 0 if x < a < b or x > a > b\n1) Returns 1 if x < b < a or x > b > a\n3) Returns a value in the range [0,1] for the domain [a,b].<\/code><\/pre>\n
 \u00a0 \u4ed6\u7684\u8fd4\u56de\u8303\u56f4\u603b\u662f\u5728\uff080,1\uff09\u5185\uff0c\u4e5f\u5c31\u662f\u5728\u900f\u660e\u5ea6\u7684\u8303\u56f4\u5185~\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u53ef\u4ee5\u4f18\u5316\u4e00\u4e0b\u6211\u4eec\u4e4b\u524d\u7684\u5706\u5f62\u51fd\u6570\u4e86\uff1a<\/p>\n
vec4 circle(vec2 pos, vec2 center, float radius, float3 color, float antialias) {\n    float d = length(pos - center) - radius;\n    float t = smoothstep(0, antialias, d);\n    return vec4(color, 1.0 - t);\n}<\/code><\/pre>\n
 \u00a0 antialias\u5c31\u662f\u5e73\u6ed1\u8fc7\u6e21\u7684\u8fb9\u754c\u8303\u56f4\u3002\u4e3a\u4e86\u65b9\u4fbf\u8c03\u8bd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728shader\u4e2d\u5229\u7528_Parameters\u7684w\u5206\u91cf\u4f5c\u4e3a\u6297\u952f\u9f7f\u56e0\u5b50\uff0c\u5f53\u7136\u5728\u5b9e\u9645\u5de5\u7a0b\u4e2d\u53ef\u4ee5\u8bbe\u4e3a\u5b9a\u503c\u3002
\n \u00a0 \u6ce8\u610f\u8fd9\u91cc\u7684_Parameters\u662f\u521a\u624d\u6211\u4eec\u81ea\u5df1\u5b9a\u4e49\u7684\u53c2\u6570\u7684w\uff0c\u53ef\u4ee5\u81ea\u5df1\u8c03\u4e00\u8c03\u611f\u53d7\u4e00\u4e0bsmoothstep\u8fd9\u4e2a\u51fd\u6570\u7684\u795e\u5999\u4e4b\u5904\u3002
\n \u00a0 \u8fd9\u91cc\u7684\u542b\u4e49\u5176\u5b9e\u5c31\u662f\u6839\u636e\u70b9\u5230\u5706\u5fc3\u7684\u8ddd\u79bb\u5728\u51cf\u534a\u5f84\u7684\u503c\u8fdb\u884c\u6a21\u7cca\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u5706\u5185\u7684\u70b9\uff0c\u5176\u5b9ed\u90fd\u4e3a\u8d1f\uff0c\u5bf9\u5e94\u7684t\u90fd\u4e3a0\uff0c\u800c\u5706\u8fb9\u7f18\u5916\u7684\u8303\u56f4\u662f\u6211\u4eec\u6a21\u7cca\u7684\u8303\u56f4\uff0cantialias\u4e5f\u5c31\u662f\u6211\u4eec\u5230\u5e95\u8981\u5bf9\u5706\u5916\u591a\u5927\u8303\u56f4\u8fdb\u884c\u6a21\u7cca<\/strong>\u3002
\n \u00a0 \u63a5\u4e0b\u6765\u5c31\u662f\u548c\u80cc\u666f\u989c\u8272\u8fdb\u884c\u6df7\u5408\uff0c\u6211\u4eec\u4f7f\u7528\u7684\u662flerp\u51fd\u6570\uff08\u5728ShaderToy\u4e2d\u5bf9\u5e94\u7684\u662fmix\u51fd\u6570\uff09\uff1a<\/p>\n
vec4 main(vec2 fragCoord) {\n    vec2 pos = fragCoord; \/\/ pos.x ~ (0, iResolution.x), pos.y ~ (0, iResolution.y)\n\n    vec4 layer1 = vec4(_BackgroundColor.rgb, 1.0);\n    vec4 layer2 = circle(pos, _Parameters.xy * iResolution.xy, _Parameters.z, _CircleColor.rgb, _Parameters.w);\n\n    return mix(layer1, layer2, layer2.a);\n}<\/code><\/pre>\n
 \u00a0 \u7136\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u8fb9\u7f18\u5149\u6ed1\u6ca1\u6709\u952f\u9f7f\u7684\u70b9\u4e86\uff01
\n\"\"<\/a>
\n \u00a0 \u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n
\nShader "Shadertoy\/Point" {\n\u00a0 \u00a0 Properties{\n\u00a0 \u00a0 \u00a0 \u00a0 _Parameters("Circle Parameters", Vector) = (0.5, 0.5, 10, 0) \/\/ Center: (x, y), Radius: z\n\u00a0 \u00a0 \u00a0 \u00a0 _Color("Circle Color", Color) = (1, 1, 1, 1)\n\u00a0 \u00a0 \u00a0 \u00a0 _BackgroundColor("Background Color", Color) = (1, 1, 1, 1)\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 CGINCLUDE\n#include "UnityCG.cginc" \u00a0\n#pragma target 3.0 \u00a0 \u00a0 \u00a0\n#define vec2 float2\n#define vec3 float3\n#define vec4 float4\n#define mat2 float2x2\n#define mat3 float3x3\n#define mat4 float4x4\n#define iGlobalTime _Time.y\n#define mod fmod\n#define mix lerp\n#define fract frac\n#define texture2D tex2D\n#define iResolution _ScreenParams\n#define gl_FragCoord ((_iParam.scrPos.xy\/_iParam.scrPos.w) * _ScreenParams.xy)\n#define PI2 6.28318530718\n#define pi 3.14159265358979\n#define halfpi (pi * 0.5)\n#define oneoverpi (1.0 \/ pi)\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _Parameters;\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _Color;\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _BackgroundColor;\n\u00a0 \u00a0 \u00a0 \u00a0 struct v2f {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float4 pos : SV_POSITION;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float4 scrPos : TEXCOORD0;\n\u00a0 \u00a0 \u00a0 \u00a0 };\n\u00a0 \u00a0 \u00a0 \u00a0 v2f vert(appdata_base v) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 v2f o;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 o.pos = UnityObjectToClipPos(v.vertex);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 o.scrPos = ComputeScreenPos(o.pos);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return o;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 main(vec2 fragCoord);\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 frag(v2f _iParam) : COLOR0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec2 fragCoord = gl_FragCoord;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return main(gl_FragCoord);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 circle(vec2 pos, vec2 center, float radius, float3 color, float antialias) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float d = length(pos - center) - radius;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float t = smoothstep(0, antialias, d);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return vec4(color, 1.0 - t);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 main(vec2 fragCoord) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer1 = vec4(_BackgroundColor.rgb, 1.0);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer2 = circle(fragCoord, _Parameters.xy * iResolution.xy, _Parameters.z, _Color.rgb, _Parameters.w);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return mix(layer1, layer2, layer2.a);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 ENDCG\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SubShader{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Pass {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CGPROGRAM\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma vertex vert \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma fragment frag \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma fragmentoption ARB_precision_hint_fastest \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ENDCG\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 FallBack Off\n}<\/code><\/pre>\n
3.\u753b\u4e24\u4e2a\u70b9<\/h5>\n
 \u00a0 \u4e4b\u524d\u7684circle\u51fd\u6570\u5df2\u7ecf\u53ef\u4ee5\u753b\u51fa\u4efb\u4f55\u4e00\u4e2a\u5927\u5c0f\u3001\u5706\u5fc3\u7684\u5706\u4e86\uff0c\u73b0\u5728\u7684\u95ee\u9898\u4ec5\u4ec5\u662f\u5982\u4f55\u5c06\u8fd9\u4e9b\u5143\u7d20\u90fd\u6dfb\u52a0\u5230\u753b\u5e03\u4e0a\u3002\u4e00\u79cd\u57fa\u672c\u7684\u601d\u60f3\u5c31\u662f\u56fe\u5c42\u53e0\u52a0\uff0c\u8fd9\u5f88\u50cf\u6211\u4eec\u5728Photoshop\u4e2d\u505a\u7684\u4e8b\u60c5\uff1a\u80cc\u666f\u5728\u6700\u540e\u4e00\u5c42\uff0c\u6211\u4eec\u53ea\u9700\u8981\u589e\u52a0\u65b0\u7684\u56fe\u5c42\uff0c\u5e76\u786e\u4fdd\u5b83\u4eec\u6309\u5c42\u7ea7\u987a\u5e8f\u4e00\u5c42\u5c42\u5411\u4e0a\u6392\u5217\u5373\u53ef\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n
vec4 main(vec2 fragCoord) {\n    vec4 layer1 = vec4(_BackgroundColor.rgb, 1.0);\n\n    vec2 point1 = vec2(0.3, 0.8);\n    vec2 point2 = vec2(0.8, 0.2);\n\n    vec4 layer2 =  circle(fragCoord, point1 * iResolution.xy, _Parameters.z, _Color.rgb, _Parameters.w);\n    vec4 layer3 =  circle(fragCoord, point2 * iResolution.xy, _Parameters.z, _Color.rgb, _Parameters.w);\n\n    vec4 fragColor = mix(layer1, layer2, layer2.a);\n    fragColor = mix(fragColor, layer3, layer3.a);\n\n    return fragColor;\n}<\/code><\/pre>\n
 \u00a0 \u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u7ed8\u5236\u4e86\u4e24\u4e2a\u5706\uff0c\u4e00\u4e2a\u5706\u5fc3\u4f4d\u7f6e\u5728(0.3, 0.8)\u5904\uff0c\u4e00\u4e2a\u5728(0.8, 0.2)\u5904\u3002\u00a0layer1\u4ecd\u65e7\u662f\u80cc\u666f\u5c42\uff0c\u00a0layer2\u548c\u00a0layer1\u5206\u522b\u8868\u793a\u4e24\u4e2a\u5706\u6240\u5728\u56fe\u5c42\u3002\u6211\u4eec\u6309\u7167\u5c42\u7ea7\u987a\u5e8f\u4f9d\u6b21\u8c03\u7528\u00a0lerp\u51fd\u6570\uff08\u4e5f\u5c31\u662f\u4ee3\u7801\u4e2d\u7684mix\u51fd\u6570\uff09\u5373\u53ef\u4ee5\u6df7\u5408\u8fd9\u4e9b\u5143\u7d20\u3002
\n\"\"<\/a><\/p>\n
4.\u753b\u4e00\u6761\u7ebf<\/h5>\n
 \u00a0 \u548c\u4e0a\u9762\u7684\u753b\u5706\u64cd\u4f5c\u4e00\u6837\uff0c\u53ea\u4e0d\u8fc7\u753b\u7ebf\u8981\u8ba1\u7b97\u7684\u662f\u7247\u5143\u662f\u5426\u5904\u4e8e\u8fd9\u6761\u7ebf\u4e0a\uff0c\u540c\u6837\uff0c\u7ebf\u4e5f\u9700\u8981\u5177\u6709\u4e00\u5b9a\u7684\u5bbd\u5ea6\uff1a<\/p>\n
vec4 line(vec2 pos, vec2 point1, vec2 point2, float width, float3 color, float antialias) {\n    float k = (point1.y - point2.y)\/(point1.x - point2.x);\n    float b = point1.y - k * point1.x;\n\n    float d = abs(k * pos.x - pos.y + b) \/ sqrt(k * k + 1);\n    float t = smoothstep(width\/2.0, width\/2.0 + antialias, d);\n    return vec4(color, 1.0 - t);\n}<\/code><\/pre>\n
 \u00a0 \u5176\u4e2d\u4e24\u70b9\u786e\u5b9a\u4e00\u6761\u652f\u7ebf\u7684\u516c\u5f0f\u5927\u5bb6\u5e94\u8be5\u8fd8\u90fd\u8bb0\u5f97\uff0cy=kx+b\uff0c\u5728\u8ba1\u7b97\u5b8c\u76f4\u7ebf\u65b9\u7a0b\u540e\uff0c\u63a5\u4e0b\u6765\u5c31\u8981\u8ba1\u7b97\u70b9\u5230\u76f4\u7ebf\u7684\u8ddd\u79bbd\u4e86\u3002\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u90fd\u5df2\u7ecf\u5fd8\u4e86\u70b9\u5230\u76f4\u7ebf\u8ddd\u79bb\u516c\u5f0f\uff1a
\n\"\"<\/a>
\n \u00a0 \u8bf4\u5b9e\u8bdd\u6211\u4e5f\u4e24\u773c\u4e00\u62b9\u9ed1\uff0c\u751a\u81f3\u8fd8\u60f3\u81ea\u5df1\u63a8\u5bfc\u4e00\u904d\u8fd9\u4e2a\u516c\u5f0f\uff0c\u4f46\u662f\u7b97\u4e86\u534a\u5929\u4e5f\u6ca1\u7b97\u660e\u767d\u3002\u540e\u9762\u6709\u65f6\u95f4\u518d\u7814\u7a76\u4e00\u4e0b\u5427<\/a>\u3002
\n \u00a0 \u7136\u540e\u5728\u5bf9\u76f4\u7ebf\u5bbd\u5ea6\u4e00\u534a\u8fdb\u884c\u4e00\u6b21\u6a21\u7cca\u64cd\u4f5c\u53bb\u6389\u952f\u9f7f\u3002\u8fd9\u91cc\u7684smoothstep\u548c\u4e0a\u9762\u5706\u5f62\u7684\u65f6\u5019\u4e0d\u592a\u4e00\u6837\uff0c\u4e0d\u8fc7\u8fd9\u91cc\u7684\u610f\u601d\u4e5f\u662f\u5f53d\u5c0f\u4e8ewidth\/2\u65f6\u5219\u8fd4\u56de0\uff0c\u4fdd\u8bc1\u8fd9\u4e2a\u7247\u5143\u5728\u76f4\u7ebf\u5185\u3002
\n \u00a0 \u63a5\u4e0b\u6765\u5c31\u662f\u5728\u521a\u624d\u7684\u4e24\u4e2a\u70b9\u7684\u57fa\u7840\u4e0a\uff0c\u518d\u52a0\u4e00\u5c42\u7ebf\u7684\u7ed8\u5236\u53e0\u52a0\u5c31\u884c\u4e86\uff01
\n\"\"<\/a>
\n \u00a0 \u5b8c\u6574\u4ee3\u7801\uff08\u8fd9\u91cc\u6211\u7528\u4f20\u5165\u53c2\u6570\u7684x\u4f5c\u4e3a\u7ebf\u7684\u5bbd\u5ea6\u4e86\uff0c\u56e0\u4e3a\u6709\u70b9\u61d2\u4e0d\u60f3\u518d\u65b0\u5f00\u5b57\u6bb5\u4e86\uff09\uff1a<\/p>\n
Shader "Shadertoy\/Point" {\n\u00a0 \u00a0 Properties{\n\u00a0 \u00a0 \u00a0 \u00a0 _Parameters("Circle Parameters", Vector) = (0.5, 0.5, 10, 0) \/\/ Center: (x, y), Radius: z\n\u00a0 \u00a0 \u00a0 \u00a0 _Color("Circle Color", Color) = (1, 1, 1, 1)\n\u00a0 \u00a0 \u00a0 \u00a0 _BackgroundColor("Background Color", Color) = (1, 1, 1, 1)\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 CGINCLUDE\n#include "UnityCG.cginc" \u00a0\n#pragma target 3.0 \u00a0 \u00a0 \u00a0\n#define vec2 float2\n#define vec3 float3\n#define vec4 float4\n#define mat2 float2x2\n#define mat3 float3x3\n#define mat4 float4x4\n#define iGlobalTime _Time.y\n#define mod fmod\n#define mix lerp\n#define fract frac\n#define texture2D tex2D\n#define iResolution _ScreenParams\n#define gl_FragCoord ((_iParam.scrPos.xy\/_iParam.scrPos.w) * _ScreenParams.xy)\n#define PI2 6.28318530718\n#define pi 3.14159265358979\n#define halfpi (pi * 0.5)\n#define oneoverpi (1.0 \/ pi)\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _Parameters;\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _Color;\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 _BackgroundColor;\n\u00a0 \u00a0 \u00a0 \u00a0 struct v2f {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float4 pos : SV_POSITION;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float4 scrPos : TEXCOORD0;\n\u00a0 \u00a0 \u00a0 \u00a0 };\n\u00a0 \u00a0 \u00a0 \u00a0 v2f vert(appdata_base v) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 v2f o;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 o.pos = UnityObjectToClipPos(v.vertex);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 o.scrPos = ComputeScreenPos(o.pos);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return o;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 main(vec2 fragCoord);\n\u00a0 \u00a0 \u00a0 \u00a0 fixed4 frag(v2f _iParam) : COLOR0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec2 fragCoord = gl_FragCoord;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return main(gl_FragCoord);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 circle(vec2 pos, vec2 center, float radius, float3 color, float antialias) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float d = length(pos - center) - radius;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float t = smoothstep(0, antialias, d);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return vec4(color, 1.0 - t);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 drawLine(vec2 pos, vec2 point1, vec2 point2, float width, float3 color, float antialias)\n\u00a0 \u00a0 \u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float k = (point1.y - point2.y) \/ (point1.x - point2.x);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float b = point1.y - k * point1.x;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float d = abs(k * pos.x - pos.y + b) \/ sqrt(k * k + 1);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 float t = smoothstep(width \/ 2.0, width \/ 2.0 + antialias, d);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return vec4(color, 1.0 - t);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 vec4 main(vec2 fragCoord) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer1 = vec4(_BackgroundColor.rgb, 1.0);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fixed2 point1 = fixed2(0.3, 0.8) * iResolution.xy;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fixed2 point2 = fixed2(0.8, 0.2) * iResolution.xy;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer2 = drawLine(fragCoord, point1, point2, _Parameters.x, _Color.rgb, _Parameters.w);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer3 = circle(fragCoord, point1, _Parameters.z, _Color.rgb, _Parameters.w);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 vec4 layer4 = circle(fragCoord, point2, _Parameters.z, _Color.rgb, _Parameters.w);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fixed4 fragColor = mix(layer1, layer2, layer2.a);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fragColor = mix(fragColor, layer3, layer3.a);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fragColor = mix(fragColor, layer4, layer4.a);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return fragColor;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 ENDCG\n\u00a0 \u00a0 \u00a0 \u00a0 SubShader{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Pass {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CGPROGRAM\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma vertex vert \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma fragment frag \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 #pragma fragmentoption ARB_precision_hint_fastest \u00a0 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ENDCG\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 FallBack Off\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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