# unity_navmesh_for_java a java lib, for invoking navmesh using jni. navmesh was exported by [https://github.com/kbengine/unity3d_nav_critterai](https://github.com/kbengine/unity3d_nav_critterai "kbengine/unity3d_nav_critterai") # How to use you can use build/recast.jar directly,it include dll lib for win64 and so lib for linux_64 # Code Demo you can load navmesh data by absolutePath: using recast.load(String absolutePath) method RecastLib recast = new RecastLib(); String path = new File( Thread.currentThread().getContextClassLoader().getResource("srv_CAIBakedNavmesh.navmesh").getFile()) .getAbsolutePath(); int meshId = recast.load(path); if (meshId <= 0) { System.out.println("load navmesh failed"); } or load navmesh data by byte[] data directly using recast.load2(String meshName,byte[] meshData) method RecastLib recast = new RecastLib(); InputStream in = Thread.currentThread().getContextClassLoader().getResource("srv_CAIBakedNavmesh.navmesh") .openStream(); byte[] data = IOUtils.toByteArray(in); int meshId = recast.load2("cainvamesh", data); if (meshId <= 0) { System.out.println("load navmesh failed"); } then use meshId to find paths by find() method. /* * x1,y1,z1 start position * x2,y2,z2 end position * * success:return paths * failed:return null or empty list */ public List find(int navmeshId, float x1, float y1, float z1, float x2, float y2, float z2); coordate system is the same as unity's, Y axis is up. if use want to release navmesh memory , use release(int navmeshId) method public int release(int navmeshId); # Complete Example you can view demo source in Demo folder import java.io.File; import java.util.List; import com.seasun.navmesh.RecastLib; public class RecastTest { public static void main(String[] args) { RecastLib recast = new RecastLib(); int meshId = recast.load(new File("srv_CAIBakedNavmesh.navmesh").getAbsolutePath()); if (meshId <= 0) { System.out.println("load navmesh failed"); } float[] start = new float[3]; start[0] = 1.727072f; start[1] = 3.570761f; start[2] = 30.0069f; float[] end = new float[3]; end[0] = 32.76521f; end[1] = 2.299392f; end[2] = -5.955514f; List list = recast.find(meshId, start[0], start[1], start[2], end[0], end[1], end[2]); if (list != null) { for (float[] l : list) { System.out.println("paths:" + l[0] + " " + l[1] + " " + l[2]); } } } } # How to export navmesh view [https://github.com/kbengine/unity3d_nav_critterai](https://github.com/kbengine/unity3d_nav_critterai "kbengine/unity3d_nav_critterai") # Build shared lib if you want to build shared lib by yourself. 1、build x64 lib - use vs2015 open recast_vs_lib\Build\vs2015\recastdemo.sln - build release lib - then use can find recastDll.dll in recast_vs_lib\Build\vs2015\obj\Release - copy it to recast_java_lib\src folder and recast_java_lib\bin folder 2、build linux x64 lib - in recast_vs_lib\Build\make, run make command - use can find recastDll.so in recast_vs_lib\Build folder - copy it to recast_java_lib\src folder and recast_java_lib\bin folder 3、build jar lib - run recast_java_lib\build_jar.bat to build jar lib. - if success,you can find recast.jar in recast_java_lib folder # unity_navmesh_for_java 一个可以使用navmesh寻路的java库，通过jni调用c++写的底层库 unity中navmesh数据使用以下工具导出 [https://github.com/kbengine/unity3d_nav_critterai](https://github.com/kbengine/unity3d_nav_critterai "kbengine/unity3d_nav_critterai") # How to use 可以直接将build/recast.jar复制在自己的工程中，jar包中已经包含了win64和linux 64的共享库，初始化时，会根据运行的平台自行选择加载的库。 # Code Demo 如何加载navmesh数据。可以使用navmesh文件所在的绝对路径进行加载使用 recast.load(String absolutePath) 方法 RecastLib recast = new RecastLib(); String path = new File( Thread.currentThread().getContextClassLoader().getResource("srv_CAIBakedNavmesh.navmesh").getFile()) .getAbsolutePath(); int meshId = recast.load(path); if (meshId <= 0) { System.out.println("load navmesh failed"); } 或者直接加载navmesh的二进制数据使用 recast.load2(String meshName,byte[] meshData) 方法 RecastLib recast = new RecastLib(); InputStream in = Thread.currentThread().getContextClassLoader().getResource("srv_CAIBakedNavmesh.navmesh") .openStream(); byte[] data = IOUtils.toByteArray(in); int meshId = recast.load2("cainvamesh", data); if (meshId <= 0) { System.out.println("load navmesh failed"); } 加载成功后返回meshId不为0，寻路时需要传入这个meshId /* * x1,y1,z1 开始坐标 * x2,y2,z2 结束坐标 * * 成功:返回路径点 * 失败:return null or empty list */ public List find(int navmeshId, float x1, float y1, float z1, float x2, float y2, float z2); 注：坐标系和unity中相同，y轴向上。一定要注意。如果navmesh不再被使用，想释放掉内存时可以主动调用 release(int navmeshId) 方法，否则，将一直在内存中直到进程终止。 public int release(int navmeshId); # Complete Example 可以在Demo文件夹中查看完整的工程 import java.io.File; import java.util.List; import com.seasun.navmesh.RecastLib; public class RecastTest { public static void main(String[] args) { RecastLib recast = new RecastLib(); int meshId = recast.load(new File("srv_CAIBakedNavmesh.navmesh").getAbsolutePath()); if (meshId <= 0) { System.out.println("load navmesh failed"); } float[] start = new float[3]; start[0] = 1.727072f; start[1] = 3.570761f; start[2] = 30.0069f; float[] end = new float[3]; end[0] = 32.76521f; end[1] = 2.299392f; end[2] = -5.955514f; List list = recast.find(meshId, start[0], start[1], start[2], end[0], end[1], end[2]); if (list != null) { for (float[] l : list) { System.out.println("paths:" + l[0] + " " + l[1] + " " + l[2]); } } } } # How to export navmesh 导出导航网格数据，查看 [https://github.com/kbengine/unity3d_nav_critterai](https://github.com/kbengine/unity3d_nav_critterai "kbengine/unity3d_nav_critterai") # Build shared lib 如果需要自己生成动态库 1、编译 win x64 下的库 - 使用 vs2015 打开 recast_vs_lib\Build\vs2015\recastdemo.sln - 点击生成，注意一定要选择release发布 - 成功后在 recast_vs_lib\Build\vs2015\obj\Release 目录下找到 recastDll.dll 文件 - 复制到 recast_java_lib\src 目录和 recast_java_lib\bin 目录下 2、编译 linux x64 下的库 - 进入 recast_vs_lib\Build\make 目录，运行 make 命令 - 在 recast_vs_lib\Build 目录下找到 recastDll.so 文件 - 复制到 recast_java_lib\src 目录和 recast_java_lib\bin 目录下 3、打包生成 jar 文件 - 运行 recast_java_lib\build_jar.bat 生成 jar 文件. - 生成后直接在 recast_java_lib目录下看到 recast.jar