{"topic":{"id":7609,"title":"2.5 BVH 渲染没有图像","slug":"topic","categoryId":56,"createdAt":"2023-12-02 07:15:23.233778","bumpedAt":"2023-12-03 05:44:07.036416","views":293,"postsCount":3,"highestPostNumber":3,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"BVH 的建立没有问题但是渲染没有图像出现 optional<Intersection> BVH::ray_node_intersect(BVHNode* node, const Ray& ray) const { ..... if (node->left == nullptr && node->right == nullptr) { isect = ray_triangle_inter…","deletedAt":null,"isAnonymous":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1081,"username":"KON","name":null,"avatarUrl":"/uploads/image/9f/35/9f3549f065dc7f323da5ebdb5fce01f65bbf19dbd566d5b3d817a08a7b59e7fd.avif"},"tags":["bvh"]},"posts":[{"id":18376,"postNumber":1,"raw":"BVH 的建立没有问题\n![图片|690x442](/uploads/image/2f/4b/2f4be95b5f935826dce85b88f06dbfee6ba1b1e3dbeb8fcd2f5bc970e5733a70.avif)\n\n但是渲染没有图像出现\n![图片|490x369](/uploads/image/77/ee/77eebe26065c9d8a619ae47ae7d740ce4b53ba86132dba7e2cb3089bb27eb321.avif)\n\n\n\n```\noptional BVH::ray_node_intersect(BVHNode* node, const Ray& ray) const\n{\n .....\n if (node->left == nullptr && node->right == nullptr) {\n isect = ray_triangle_intersect(ray, mesh, node->face_idx);\n return isect;\n } else{\n auto isect_left = ray_node_intersect(node->left, ray);\n auto isect_right = ray_node_intersect(node->right, ray);\n\n return isect_left->t < isect_right->t ? isect_left : isect_right;\n }\n}\n```\n\n![图片|155x500](/uploads/image/4f/61/4f6183bf35f06d3a59874fd382d37da6ccd62de6bae186a39bb2746dab8f42bf.avif)\n\n `ray_triangle_intersect()` 函数有正常的返回值，但是 `BVH::intersect()` 中得到的 `isect` 一直为空，请问会是哪里的问题呢 :loudly_crying_face:\n\n\n```\noptional BVH::intersect(const Ray& ray, [[maybe_unused]] const GL::Mesh& mesh,\n const Eigen::Matrix4f obj_model){\n .......\n isect = ray_node_intersect(root, model_ray);\n if (isect.has_value()) {\n isect->normal = (model_inv.transpose() *\n Vector4f(isect->normal.x(), isect->normal.y(), isect->normal.z(), 0.0f)).head<3>();\n }\n return isect;\n}\n```","cooked":"

BVH 的建立没有问题
\n $\"图片\"$

但是渲染没有图像出现
\n $\"图片\"$

optional<Intersection> BVH::ray_node_intersect(BVHNode* node, const Ray& ray) const\n{\n    .....\n    if (node->left == nullptr && node->right == nullptr) {\n        isect = ray_triangle_intersect(ray, mesh, node->face_idx);\n        return isect;\n    } else{\n        auto isect_left  = ray_node_intersect(node->left, ray);\n        auto isect_right = ray_node_intersect(node->right, ray);\n\n        return isect_left->t < isect_right->t ? isect_left : isect_right;\n    }\n}\n

$\"图片\"$

ray_triangle_intersect() 函数有正常的返回值，但是 BVH::intersect() 中得到的 isect 一直为空，请问会是哪里的问题呢 😭

optional<Intersection> BVH::intersect(const Ray& ray, [[maybe_unused]] const GL::Mesh& mesh,\n                                      const Eigen::Matrix4f obj_model){\n    .......\n    isect = ray_node_intersect(root, model_ray);\n    if (isect.has_value()) {\n        isect->normal = (model_inv.transpose() *\n                         Vector4f(isect->normal.x(), isect->normal.y(), isect->normal.z(), 0.0f)).head<3>();\n    }\n    return isect;\n}\n

\n","createdAt":"2023-12-02 07:15:23.437398","updatedAt":"2023-12-03 12:34:51.801651","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":147,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":2,"publicVersion":2,"deletedAt":null,"isAnonymous":false,"user":{"id":1081,"username":"KON","name":null,"avatarUrl":"/uploads/image/9f/35/9f3549f065dc7f323da5ebdb5fce01f65bbf19dbd566d5b3d817a08a7b59e7fd.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":18401,"postNumber":2,"raw":"你的遍历考虑掉了左右子树之一是空，而另一侧还有子节点的情况，不妨改了之后再试一试","cooked":"

你的遍历考虑掉了左右子树之一是空，而另一侧还有子节点的情况，不妨改了之后再试一试

\n","createdAt":"2023-12-02 14:52:49.548525","updatedAt":"2023-12-02 14:52:49.548525","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":40,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1488,"username":"roland","name":"李昌洲","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":18453,"postNumber":3,"raw":"感谢学长 :hooray:","cooked":"

感谢学长 🥳

\n","createdAt":"2023-12-03 05:44:07.036416","updatedAt":"2023-12-03 05:44:07.036416","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":5,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1081,"username":"KON","name":null,"avatarUrl":"/uploads/image/9f/35/9f3549f065dc7f323da5ebdb5fce01f65bbf19dbd566d5b3d817a08a7b59e7fd.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":1,"hasUrlPostNumber":false}