{"topic":{"id":7042,"title":"naive_intersection 无法传入 center","slug":"topic","categoryId":56,"createdAt":"2023-11-04 02:59:32.37519","bumpedAt":"2023-11-05 02:59:47.539234","views":233,"postsCount":3,"highestPostNumber":4,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"必须在原本物体坐标加上 center 才是当前真正的位置：然而 naive_intersection 无法传入更多参数，修改函数不太现实 ; 在函数外面修改又没有办法传入参数，有什么办法嘛","deletedAt":null,"isAnonymous":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1510,"username":"lzx_djb","name":"asasa","avatarUrl":null},"tags":[]},"posts":[{"id":16017,"postNumber":1,"raw":"必须在原本物体坐标加上 center 才是当前真正的位置：然而\n![image|690x31](/uploads/image/27/cd/27cdc8c8383a0d414680ed6189cb054f6a44e5d2c0a4634294c6506a8cba7bb0.avif)\nnaive_intersection 无法传入更多参数，修改函数不太现实 ; 在函数外面修改又没有办法传入参数，有什么办法嘛","cooked":"

必须在原本物体坐标加上 center 才是当前真正的位置：然而
\n $\"image\"$
\nnaive_intersection 无法传入更多参数，修改函数不太现实 ; 在函数外面修改又没有办法传入参数，有什么办法嘛

\n","createdAt":"2023-11-04 02:59:32.458208","updatedAt":"2023-11-04 12:01:25.489652","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":67,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":2,"publicVersion":2,"deletedAt":null,"isAnonymous":false,"user":{"id":1510,"username":"lzx_djb","name":"asasa","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16100,"postNumber":2,"raw":"你这里的认识其实就不太完整：\n\n> 必须在原本物体坐标加上 center 才是当前真正的位置\n\n`naive_intersect` 这个函数是在**世界坐标系**下求交的，因此模型坐标不止要加 `center`，而是需要完成整个模型变换，才能得到 mesh 顶点的世界坐标。你应该利用该函数的第三个参数 (model matrix) 直接进行模型变换来得到世界坐标，不需要考虑如何传入物体位姿参数的问题。","cooked":"

你这里的认识其实就不太完整：

\n
必须在原本物体坐标加上 center 才是当前真正的位置
\n

naive_intersect 这个函数是在世界坐标系下求交的，因此模型坐标不止要加 center，而是需要完成整个模型变换，才能得到 mesh 顶点的世界坐标。你应该利用该函数的第三个参数 (model matrix) 直接进行模型变换来得到世界坐标，不需要考虑如何传入物体位姿参数的问题。

\n","createdAt":"2023-11-04 12:08:08.762262","updatedAt":"2023-11-04 12:08:08.762262","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":143,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1381,"username":"greyishsong","name":"greyishsong","avatarUrl":"/uploads/image/da/bc/dabc731b0311f59850625bbeb55ed969fcfac0430c5ef0f68441e5466b7aa496.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16273,"postNumber":4,"raw":"我想调用 model，发现是我之前基础作业部分的 model 函数\n![image|505x500](/uploads/image/25/af/25af44e9f7225434fbc588fcffe545e28ff965a82776e13d97da22452519eca9.avif)\n\n,通过它，我应该没有办法传入 center , 我想往函数里面传递参数，但是 model 不让我传递参数","cooked":"

我想调用 model，发现是我之前基础作业部分的 model 函数
\n $\"image\"$

,通过它，我应该没有办法传入 center , 我想往函数里面传递参数，但是 model 不让我传递参数

\n","createdAt":"2023-11-05 02:59:47.539234","updatedAt":"2023-11-05 02:59:47.539234","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":60,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1510,"username":"lzx_djb","name":"asasa","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":4,"hasUrlPostNumber":true}