{"topic":{"id":6931,"title":"调用 naive _intersection","slug":"topic","categoryId":56,"createdAt":"2023-11-01 12:03:17.141387","bumpedAt":"2023-11-01 13:11:02.905771","views":208,"postsCount":2,"highestPostNumber":2,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"我想调用 naive_intersection():尝试这样调用: 无法成功","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":15549,"postNumber":1,"raw":"我想调用 naive_intersection():尝试这样调用:\n![image|690x91](/uploads/image/e7/71/e7712dcdde850fbedd41cbe1e5742f28db9265d1e716a7873c1ff5726921fdb5.avif)\n无法成功","cooked":"

我想调用 naive_intersection():尝试这样调用:
\n $\"image\"$
\n无法成功

\n","createdAt":"2023-11-01 12:03:17.212095","updatedAt":"2023-11-01 13:00:14.290043","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":17,"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":15556,"postNumber":2,"raw":"同学你调用的方式可以说没有一点对的地方……\n\n首先，为什么不看看 [开发者文档：naive_intersect](https://dandelion-docs.readthedocs.io/zh-cn/latest/db/d81/group__rendering.html#ga1a3a6b802c525058a523c2dadaae1f2b) 呢？这里已经给出了函数原型（声明），你需要按照形参列表的类型来传参、按照声明的返回值类型来接收。所以，\n\n- 你应该用 `std::optional` 类型的变量来接收返回值，至于什么是 `std::optional` 你应该自己去查资料，这是我们要求你自学的。\n- 三个实参应当依次是 `Ray`, `GL::Mesh`, `Eigen::Matrix4f` 类型，并且依次用逗号隔开。截图中传参时多套了一层括号已经违反 C++ 语法规则了，参数个数也不对。我猜你是想调用 `m->model()` 来获取某个物体的 Model 矩阵，但不管怎么说你这个用空格分割的写法都不可能得到你想要的东西。\n\n就截图中的情况来看，你可能需要下工夫去重新复习 C++ 的基本语法，至少对类型、函数、指针和类有基本的了解之后再来写代码，否则还会遇到更多语法问题。","cooked":"

同学你调用的方式可以说没有一点对的地方……

首先，为什么不看看开发者文档：naive_intersect 呢？这里已经给出了函数原型（声明），你需要按照形参列表的类型来传参、按照声明的返回值类型来接收。所以，

你应该用 std::optional<Intersection> 类型的变量来接收返回值，至于什么是 std::optional 你应该自己去查资料，这是我们要求你自学的。
三个实参应当依次是 Ray, GL::Mesh, Eigen::Matrix4f 类型，并且依次用逗号隔开。截图中传参时多套了一层括号已经违反 C++ 语法规则了，参数个数也不对。我猜你是想调用 m->model() 来获取某个物体的 Model 矩阵，但不管怎么说你这个用空格分割的写法都不可能得到你想要的东西。

就截图中的情况来看，你可能需要下工夫去重新复习 C++ 的基本语法，至少对类型、函数、指针和类有基本的了解之后再来写代码，否则还会遇到更多语法问题。

\n","createdAt":"2023-11-01 13:11:02.905771","updatedAt":"2023-11-01 13:11:02.905771","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":309,"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}}],"hasMore":false,"lastReadPostNumber":1,"hasUrlPostNumber":false}