posts/20203/

[hxhb]

https://imzlp.com/posts/20203/

Recast Navigation是一个开源的游戏导航/寻路引擎，可以为游戏中的AI提供寻路计算。UE和Unity都是集成了RecastNavigation来为游戏提供寻路(当然是修改过的版本)，UE中模块NavigationSystem以及NavMesh中可以看到相关的代码。

[papalqi]

大佬，你知道为什么寻路的sys,是all actor on all level 在八叉树中。。。它的八叉树是做什么作用的

[papalqi]

我想用recastnavmesh的体素化过成的结果，不知道应该怎么做

[hxhb]

@papalqi 我想用recastnavmesh的体素化过成的结果，不知道应该怎么做

你可以看一下RecastDemo中的Voxels或者Walkable Voxels的部分，在RecastDemo/Source/Sample_SoloMesh.cpp#L289。

[MacSummer]

安装了插件，使用的是UE4.23，导出了TopDown这个例子的导航图，用recast demo打开，无法拉近查看，按build，等待一会后recastdemo直接崩溃了，这个有什么要求吗？

[hxhb]

@maydayzm 安装了插件，使用的是UE4.23，导出了TopDown这个例子的导航图，用recast demo打开，无法拉近查看，按build，等待一会后recastdemo直接崩溃了，这个有什么要求吗？

导出NavMesh是额外的东西，如果只是想要在外面使用UE的Recast导航数据，直接使用插件导出的.bin就可以了。 你遇到的RecastDemo会Crash的问题是因为默认导出NavMesh的单位是cm，导进到RecastDemo中太大，可以修改一下单位为m，我在ExternRecastNavMeshGenetator.cpp#L61中已经写了相关的代码了，把导出cm的代码取消注释，然后把下面导出为m的注释即可。

[hxhb]

@maydayzm 另外，不建议直接使用从RecastDemo生成的bin，因为配置参数无法与UE的完全保持一致，直接使用插件导出的bin就好。

[MacSummer]

@hxhb @maydayzm 另外，不建议直接使用从RecastDemo生成的bin，因为配置参数无法与UE的完全保持一致，直接使用插件导出的bin就好。

感谢~ recastdemo上已成功build 使用的话还是会用UE4的插件产生的bin文件，在recast上只是用来查看寻路路径而已~

[BuLiangRenDarkStar]

你好，我是做unity的。想问下这句话的意思“从UE导出Navmesh的含义是，把UE寻路范围内的模型导出”，请问这里导出的NavMesh.obj文件是导航网格还是场景里需要烘焙的模型？

[hxhb]

你好，我是做unity的。想问下这句话的意思“从UE导出Navmesh的含义是，把UE寻路范围内的模型导出”，请问这里导出的NavMesh.obj文件是导航网格还是场景里需要烘焙的模型？

模型，需要在这个模型上生成导航信息。

[ghost]

Hey! Hello and greetings from Argentina! Thanks for doing this awesome work and sharing! There's so few out information out there about this!

I wanted to ask you something because I'm trying to implement your plugin into my UE4 project, and everything until now seems fine. I can extract the NavMesh easily and then I run the tests with ue4-detour.exe and all the valid and invalid points are OK, the same ones I obtain when projecting them inside the game.

The problem I think is in the server side! I want to calculate some paths in the server with the navmesh obtained with your plugin. For that, I was thinking about doing this steps: 1) Export the navmesh to the server 2) Load the navmesh in the server code, and Deserialize it, like in this function https://github.com/hxhb/ue4-recast-detour/blob/master/UE4RecastHelper.cpp#L207 3) Convert the Origin and Destination points from Unreal2Recast using functions like this ones: https://github.com/hxhb/ue4-recast-detour/blob/master/UE4RecastHelper.cpp#L283 4) Calculate the path

Do you think this steps are correct? Or is there something I'm missing? Thank you so much again for youor work and I hope you could give me a hint or point me in the right direction.

[hxhb]

Hey! Hello and greetings from Argentina! Thanks for doing this awesome work and sharing! There's so few out information out there about this!

I wanted to ask you something because I'm trying to implement your plugin into my UE4 project, and everything until now seems fine. I can extract the NavMesh easily and then I run the tests with ue4-detour.exe and all the valid and invalid points are OK, the same ones I obtain when projecting them inside the game.

The problem I think is in the server side! I want to calculate some paths in the server with the navmesh obtained with your plugin. For that, I was thinking about doing this steps:

1. Export the navmesh to the server
2. Load the navmesh in the server code, and Deserialize it, like in this function https://github.com/hxhb/ue4-recast-detour/blob/master/UE4RecastHelper.cpp#L207
3. Convert the Origin and Destination points from Unreal2Recast using functions like this ones: https://github.com/hxhb/ue4-recast-detour/blob/master/UE4RecastHelper.cpp#L283
4. Calculate the path

Do you think this steps are correct? Or is there something I'm missing? Thank you so much again for youor work and I hope you could give me a hint or point me in the right direction.

I submitted the latest code, please pull the master branch and use ue4-findpath.cpp for pathfinding test.