Ground cover for three.js

Using it in three.js

In three.js, load GLB with GLTFLoader from three/addons; add DRACOLoader or KTX2Loader only if a file uses those extensions.

• Distance LOD: THREE.LOD with lod.addLevel(mesh, distance) for LOD0–LOD3; it switches levels by camera distance every frame.
• Forests: InstancedMesh draws thousands of copies in one draw call, and BatchedMesh mixes several tree variations. THREE.LOD does not apply per instance, so group instances by LOD per chunk yourself.
• Leaves: glTF alphaMode MASK becomes material.alphaTest, and double-sided materials get side: THREE.DoubleSide automatically.
• Collision mesh: keep it invisible and pass it to a physics library such as Rapier or cannon-es.

Works with both WebGLRenderer and WebGPURenderer.