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Recast4j

Java Port of Recast and Detour navigation mesh toolset.

screenshot of a navmesh baked with the sample program

Recast

Recast is state of the art navigation mesh construction toolset for games.

Recast is...

Recast constructs a navmesh through a multi-step rasterization process:

  1. First Recast voxelizes the input triangle mesh by rasterizing the triangles into a multi-layer heightfield.
  2. Voxels in areas where the character would not be able to move are removed by applying simple voxel data filters.
  3. The walkable areas described by the voxel grid are then divided into sets of 2D polygonal regions.
  4. The navigation polygons are generated by triangulating and stiching together the generated 2d polygonal regions.

Detour

Recast is accompanied by Detour, a path-finding and spatial reasoning toolkit. You can use any navigation mesh with Detour, but of course the data generated with Recast fits perfectly.

Detour offers a simple static navmesh data representation which is suitable for many simple cases. It also provides a tiled navigation mesh representation, which allows you to stream of navigation data in and out as the player progresses through the world and regenerate sections of the navmesh data as the world changes.

More information about Recast and Detour

Java Version

How To Use

The API is kept as close to https://github.com/recastnavigation/recastnavigation as possible so most of the information and hints apply to recast4j too. You can find a lot of examples in tests e.g.

Java Version Enhancements

recast

detour

detour-tile-cache

detour-extras

detour-dynamic

Building from Source

All the modules can be built with a single gradle command:

./gradlew clean build shadow

Once the build is completed, the recast-demo application can be run as follows:

java -jar ./recast-demo/build/libs/recast-demo-1.5.8-SNAPSHOT-all.jar

Binaries

Releases

Recast4j releases are available in Maven Central Repository. Maven:

<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>recast</artifactId>
	<version>1.5.7</version>
</dependency>
<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>detour</artifactId>
	<version>1.5.7</version>
</dependency>
<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>detour-crowd</artifactId>
	<version>1.5.7</version>
</dependency>
<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>detour-tile-cache</artifactId>
	<version>1.5.7</version>
</dependency>
<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>detour-extras</artifactId>
	<version>1.5.7</version>
</dependency>
<dependency>
	<groupId>org.recast4j</groupId>
	<artifactId>detour-dynamic</artifactId>
	<version>1.5.7</version>
</dependency>

Gradle:

implementation 'org.recast4j:recast:1.5.7'
implementation 'org.recast4j:detour:1.5.7'
implementation 'org.recast4j:detour-crowd:1.5.7'
implementation 'org.recast4j:detour-tile-cache:1.5.7'
implementation 'org.recast4j:detour-extras:1.5.7'
implementation 'org.recast4j:detour-dynamic:1.5.7'

License

Recast & Detour is licensed under ZLib license, see License.txt for more information.