{"action":"created","issue":{"url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/27","repository_url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book","labels_url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/27/labels{/name}","comments_url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/27/comments","events_url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/27/events","html_url":"https://github.com/candycat1992/Unity_Shaders_Book/issues/27","id":170563923,"number":27,"title":"P238 对广告牌的疑惑","user":{"login":"CaigerDeng","id":13826934,"avatar_url":"https://avatars.githubusercontent.com/u/13826934?v=3","gravatar_id":"","url":"https://api.github.com/users/CaigerDeng","html_url":"https://github.com/CaigerDeng","followers_url":"https://api.github.com/users/CaigerDeng/followers","following_url":"https://api.github.com/users/CaigerDeng/following{/other_user}","gists_url":"https://api.github.com/users/CaigerDeng/gists{/gist_id}","starred_url":"https://api.github.com/users/CaigerDeng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/CaigerDeng/subscriptions","organizations_url":"https://api.github.com/users/CaigerDeng/orgs","repos_url":"https://api.github.com/users/CaigerDeng/repos","events_url":"https://api.github.com/users/CaigerDeng/events{/privacy}","received_events_url":"https://api.github.com/users/CaigerDeng/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/labels/enhancement","name":"enhancement","color":"84b6eb"}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2016-08-11T03:29:37Z","updated_at":"2016-08-18T02:27:25Z","closed_at":null,"body":"这页的中间，最开始定义锚点：\r\n“选择模型空间的原点作为广告牌的锚点”\r\nfloat3 center = float3(0,0,0);\r\n这里的0对后面的计算不影响啊，不知道选原点(0,0,0)有什么意义？\r\n"},"comment":{"url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/comments/240606764","html_url":"https://github.com/candycat1992/Unity_Shaders_Book/issues/27#issuecomment-240606764","issue_url":"https://api.github.com/repos/candycat1992/Unity_Shaders_Book/issues/27","id":240606764,"user":{"login":"CaigerDeng","id":13826934,"avatar_url":"https://avatars.githubusercontent.com/u/13826934?v=3","gravatar_id":"","url":"https://api.github.com/users/CaigerDeng","html_url":"https://github.com/CaigerDeng","followers_url":"https://api.github.com/users/CaigerDeng/followers","following_url":"https://api.github.com/users/CaigerDeng/following{/other_user}","gists_url":"https://api.github.com/users/CaigerDeng/gists{/gist_id}","starred_url":"https://api.github.com/users/CaigerDeng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/CaigerDeng/subscriptions","organizations_url":"https://api.github.com/users/CaigerDeng/orgs","repos_url":"https://api.github.com/users/CaigerDeng/repos","events_url":"https://api.github.com/users/CaigerDeng/events{/privacy}","received_events_url":"https://api.github.com/users/CaigerDeng/received_events","type":"User","site_admin":false},"created_at":"2016-08-18T02:27:25Z","updated_at":"2016-08-18T02:27:25Z","body":"感谢这详细的解答，我理解了。\r\n我看了给的两个链接，觉得还是第一个链接“雾和体积光”讲的容易理解些，讲的比书上这段”草丛“的举例好些，草丛的例子我还是和237页的彩图一起想想，才明白这个草丛到底是怎么观看的。第二个链接之前有看过，感觉最有用的是里面的GIF水箱图，但博主的解释是真的一头雾水。\r\n237页的彩图真好，是广告牌这段里最直观最好理解的了。"}}
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