{"id":395,"date":"2020-11-09T21:05:24","date_gmt":"2020-11-09T13:05:24","guid":{"rendered":"http:\/\/meecarlo.com\/?p=395"},"modified":"2026-06-26T00:31:53","modified_gmt":"2026-06-25T16:31:53","slug":"raymarchings-post-work","status":"publish","type":"post","link":"https:\/\/meecarlo.com\/old\/2020\/11\/09\/raymarchings-post-work\/","title":{"rendered":"RayMarching\u2019s Post Work"},"content":{"rendered":"\n<p>         \u5728\u5b66\u4e60\u5173\u4e8eRay Marching\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u53d1\u73b0\u5bf9\u4e8eRay Marching\u7684\u7406\u89e3\u53ef\u4ee5\u901a\u8fc7ShaderToy\u6765\u52a0\u6df1\u4e00\u4e0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/1-1024x553.png\" alt=\"\" class=\"wp-image-396\"\/><figcaption>Ray Marching\u539f\u7406<\/figcaption><\/figure>\n\n\n\n<p>        \u5982\u4e0a\u56fe\u6240\u5c5e\uff0c\u6211\u4eec\u7684\u6444\u50cf\u673a\u9700\u8981\u83b7\u53d64\u7ec4\u6570\u636e\uff0cUV\u3001\u6444\u50cf\u673a\u4f4d\u7f6e\uff08CameraPos\uff09\u3001\u89c6\u7ebf\uff08ViewDir\uff09\u3001\u7f29\u653e\uff0c\u7136\u540e\u6839\u636e\u8fd9\u56db\u7ec4\u6570\u636e\u8fdb\u884c\u8f93\u51fa\u5149\u7ebf\uff0c\u8fd9\u4e2a\u5149\u7ebf\u662f\u4e2a\u5411\u91cf\uff0c\u7136\u540e\u7ecf\u8fc7\u4e00\u4e2a\u9ed1\u7bb1\u64cd\u4f5c\uff08\u8fd9\u91cc\u6307Ray Marching\uff09\u8f93\u51fa\u4e00\u7ec4\u6570\u636e\uff0c\u6211\u4eec\u5728\u8fd9\u7ec4\u6570\u636e\u4e0a\u8fdb\u884c\u6750\u8d28\u7684\u6dfb\u52a0\u4e0e\u7cfb\u5217\u64cd\u4f5c\uff0c\u6700\u7ec8\u8f93\u51fa\u5230\u6211\u4eec\u7684\u7247\u5143\u7740\u8272\u5668\/\u50cf\u7d20\u7740\u8272\u5668\uff08fragment shader\/pixel shader\uff09\u3002\u800c\u6211\u4eec\u9700\u8981\u8fdb\u884c\u7684\u64cd\u4f5c\u5c31\u662f\u5982\u4f55\u8fdb\u884c\u9ed1\u7bb1\u8ba1\u7b97\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"https:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/1-1-1-1024x542.gif\" alt=\"\" class=\"wp-image-404\"\/><figcaption>Ray Marching\u4e2d\u7684\u9ed1\u7bb1<\/figcaption><\/figure>\n\n\n\n<p>        \u5982\u4e0a\u6211\u4eec\u5177\u4f53\u6240\u505a\u7684\u5c31\u662f\u4e0a\u9762\u56fe\u4e2d\u7684\u64cd\u4f5c\uff0c\u4e0d\u65ad\u7684\u4f7f\u7528\u5149\u7ebf\u6b65\u8fdb\u6765\u68c0\u6d4b\u7269\u4f53<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/23-1024x546.png\" alt=\"\" class=\"wp-image-405\"\/><figcaption>\u7b2c\u4e00\u6b21\u6b65\u8fdb<\/figcaption><\/figure>\n\n\n\n<p>        \u7b2c\u4e00\u6b21\u6b65\u8fdb\u63a5\u89e6\u5230\u6700\u9760\u8fd1\u76f8\u673a\u7684\u7269\u4f53\u8868\u9762\uff0c\u6211\u4eec\u5728\u8fd9\u6253\u4e2a\u6807\u8bb0\uff0c\u8868\u793a\u7b2c\u4e00\u6b21\u6b65\u8fdb\uff0c\u7136\u540e\u4f9d\u6b21\u4e3a\u5706\u5fc3\u518d\u5bf9\u5176\u4ed6\u7684\u5149\u7ebf\u8fdb\u884c\u6b65\u8fdb<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/24-1024x546.png\" alt=\"\" class=\"wp-image-409\"\/><figcaption>\u7b2c\u4e8c\u6b21\u6b65\u8fdb<\/figcaption><\/figure>\n\n\n\n<p>        \u7b2c\u4e8c\u6b21\u6b65\u8fdb\u6211\u4eec\u5728\u6b21\u53d1\u6563\u51fa\u53bb\u7684\u5149\u53c8\u4e00\u6b21\u63a5\u89e6\u5230\u4e86\u79bb\u6b64\u5904\u6700\u8fd1\u7684\u7269\u4f53\u8868\u9762\u4e5f\u5c31\u662f\u9ec4\u5708\u7684\u534a\u5f84\uff0c\u6211\u4eec\u5728\u6b64\u518d\u6b21\u6253\u4e2a\u70b9\u8fdb\u884c\u6211\u4eec\u4e0b\u4e00\u6b65\u7684\u6b65\u8fdb\u3002\u7136\u540e\u5468\u800c\u590d\u59cb\u8fbe\u5230\u6700\u8fdc\u7684\u70b9\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/28-1024x543.png\" alt=\"\" class=\"wp-image-411\"\/><figcaption>\u6700\u7ec8\u7684\u6b65\u8fdb<\/figcaption><\/figure>\n\n\n\n<p>         \u5982\u6b64\u6211\u4eec\u5c31\u80fd\u52fe\u52d2\u51fa\u4e00\u4e2a\u5927\u4f53\u7684\u5f62\u72b6.\u6211\u4eec\u5728\u8fd9\u4e00\u90e8\u7684\u4ee3\u7801\u53ef\u4ee5\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>float raymarching(vec3 ro, vec3 rd){\n\tfloat dO=0.;\n        \n        for(int i=0; i&lt;MAX_STEPS;i++){\n        \tvec3 p = ro + rd*dO;\n            float dS = GetDist(p);\n            dO +=dS;\n            if (dO>MAX_DIST || dS&lt;SURF_DIST) break;\n        \n        \n        }\n        \n    return dO;\n}<\/code><\/pre>\n\n\n\n<p>        \u5728\u8fd9\u4e2a\u51fd\u6570\u4e4b\u524d\uff0c\u6211\u4eec\u9700\u8981\u518d\u5199\u4e00\u6bb5\u51fd\u6570\u6765\u83b7\u5f97\u6b65\u8fdb\u8ddd\u79bb\u7684\u51fd\u6570\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/29-1024x546.png\" alt=\"\" class=\"wp-image-413\"\/><figcaption>\u83b7\u5f97\u6b65\u8fdb\u8ddd\u79bb<\/figcaption><\/figure>\n\n\n\n<p>        \u9996\u5148\u6211\u4eec\u5148\u83b7\u5f97\u4e24\u4e2a\u8ddd\u79bb\uff0c\u4e00\u4e2a\u662f\u76f8\u673a\u5230\u5730\u9762\u7684\u8ddd\u79bb\uff0c\u4e00\u4e2a\u662f\u76f8\u673a\u5230\u7269\u4f53\u8868\u9762\u7684\u8ddd\u79bb\uff0c\u5728\u8fd9\u91cc\u7269\u4f53\u662f\u4e00\u4e2a\u7403\uff0c\u76f8\u673a\u5230\u5730\u9762\u7684\u8ddd\u79bb\u53ef\u4ee5\u901a\u8fc7cameraPos.y-plane.y\u6765\u83b7\u5f97\uff0c\u5728\u8fd9\u91cc\u76f8\u673a\u5230\u5730\u9762\u7684\u8ddd\u79bb\u5c31\u662f\u76f8\u673a\u7684y\u5750\u6807\u3002\u76f8\u673a\u5230\u7403\u4f53\u8868\u9762\u7684\u8ddd\u79bb\u662f\u76f8\u673a\u5750\u6807\u51cf\u53bb\u7403\u5fc3\u5750\u6807\u53d6\u6a21\uff0c\u518d\u51cf\u53bb\u7403\u7684\u534a\u5f84\u3002\u6211\u4eec\u4e3a\u4e86\u786e\u4fdd\u5149\u7ebf\u80fd\u591f\u5b89\u5168\u7684\u8fbe\u5230\u7269\u4f53\u8868\u9762\uff0c\u6211\u4eec\u9700\u8981\u5c06\u76f8\u673a\u4e0e\u4efb\u610f\u7269\u4f53\u7684\u8ddd\u79bb\u4f5c\u4e3a\u521d\u59cb\u7684\u6b65\u8fdb\u8ddd\u79bb\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u7528\u76f8\u673a\u5230\u5730\u9762\u7684\u8ddd\u79bb\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/30-1024x541.png\" alt=\"\" class=\"wp-image-414\"\/><figcaption>\u5b89\u5168\u6b65\u8fdb<\/figcaption><\/figure>\n\n\n\n<p>        \u6240\u4ee5\u6b64\u5904\u7684\u6b65\u8fdb\u65b9\u5f0f\u5e94\u8be5\u5982\u4e0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"http:\/\/meecarlo.com\/wp-content\/uploads\/2020\/11\/31-1024x541.png\" alt=\"\" class=\"wp-image-415\"\/><\/figure>\n\n\n\n<p>\u3000\u3000\u3000\u3000\u5982\u6b64\u6b65\u8fdb\u4fbf\u80fd\u5b89\u5168\u6709\u6548\u7684\u8fbe\u5230\u7269\u4f53\u7684\u8868\u9762\u3002\u6b64\u5904\u4ee3\u7801\u4e3a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>float GetDist(vec3 p){\n\tvec4 s = vec4 (0, 1, 6, 1);\n    \n    float sphereDist = length(p-s.xyz)-s.w;\n    float planeDist=p.y;\n    \n    float d = min(sphereDist,planeDist);\n    return d;\n    \n\n\n}<\/code><\/pre>\n\n\n\n<p>        \u4e4b\u540e\u6dfb\u52a0\u706f\u5149\u5e76\u83b7\u53d6\u6cd5\u7ebf\u5c31\u80fd\u8fdb\u884c\u7b80\u5355\u7684\u6a21\u578b\u7f16\u5199\u3002<\/p>\n\n\n\n<p>\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#define MAX_STEPS 100\n#define MAX_DIST 100.\n#define SURF_DIST .01\n\n\nfloat GetDist(vec3 p){\n\tvec4 s = vec4 (0, 1, 6, 1);\n    \n    float sphereDist = length(p-s.xyz)-s.w;\n    float planeDist=p.y;\n    \n    float d = min(sphereDist,planeDist);\n    return d;\n    \n\n\n}\n\n\nfloat raymarching(vec3 ro, vec3 rd){\n\tfloat dO=0.;\n        \n        for(int i=0; i&lt;MAX_STEPS;i++){\n        \tvec3 p = ro + rd*dO;\n            float dS = GetDist(p);\n            dO +=dS;\n            if (dO>MAX_DIST || dS&lt;SURF_DIST) break;\n        \n        \n        }\n        \n    return dO;\n\n\n\n}\n\nvec3 GetNormal(vec3 p){\n\tfloat d = GetDist(p);\n    vec2 e = vec2(.01,0);\n    \n    vec3 n = d- vec3(\n        GetDist(p-e.xyy),\n        GetDist(p-e.yxy),\n        GetDist(p-e.yyx));\n        return normalize(n);\n}\n\nfloat GetLight(vec3 p){\n    vec3 lightPos = vec3(0, 5, 6);\n    lightPos.xy += vec2(sin(iTime),cos(iTime))*2.;\n    vec3 l = normalize(lightPos-p);\n    vec3 n = GetNormal(p);\n    \n    float dif = clamp(dot(n,l),0.,1.);\n    \n    float d =  raymarching(p+n*SURF_DIST*2.,l);\n    if(d&lt;length(lightPos-p)) dif *=.1;\n    \n    return dif;\n\n\n}\n\n\n\nvoid mainImage( out vec4 fragColor, in vec2 fragCoord)\n{\n    vec2 uv = (fragCoord-0.5*iResolution.xy)\/iResolution.y;\n    \n    vec3 col = vec3(0);\n    \n    vec3 ro =vec3(0,1,0);\n    vec3 rd = normalize(vec3(uv.x,uv.y,1));\n    \n\tfloat d=raymarching(ro,rd);\n    \n    vec3 p = ro + rd * d;\n    \n    float dif = GetLight(p);\n    col = vec3(dif);\n    \n   \n    \n    fragColor = vec4(col,1.0);\n\n\n\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5b66\u4e60\u5173\u4e8eRay Marching\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u53d1\u73b0\u5bf9\u4e8eRay Marching\u7684\u7406\u89e3\u53ef\u4ee5\u901a\u8fc7ShaderToy &hellip; <a href=\"https:\/\/meecarlo.com\/old\/2020\/11\/09\/raymarchings-post-work\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">RayMarching\u2019s Post Work<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":398,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,1],"tags":[],"class_list":["post-395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-study-note","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/posts\/395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/comments?post=395"}],"version-history":[{"count":2,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/posts\/395\/revisions"}],"predecessor-version":[{"id":1067,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/posts\/395\/revisions\/1067"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/meecarlo.com\/old\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/media?parent=395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/categories?post=395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/meecarlo.com\/old\/wp-json\/wp\/v2\/tags?post=395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}