ForestGenerator.html.md 1.1 KB
ForestGenerator
Carpets a TerrainGenerator ( or anything exposing sampleHeight, sampleSlope, minY, maxY and parameters.size ) with a forest of hundreds of thousands of trees in a single draw call.
Each tree is the cheapest thing that still reads as a tree: a ~20-face icosphere squashed into a tapered teardrop and lumped with a little noise, carrying a baked dark-base / bright-top gradient. Tens of triangles each, so a single THREE.InstancedMesh of half a million of them costs one draw call. Trees are placed by rejection sampling against ecological rules — a min/max altitude band ( above the mist floor, below the snowline ), a slope limit ( none on cliffs ) and a low-frequency density mask that opens clearings — then jittered in yaw, lean and ( squared-biased ) scale so the stand never reads as copies.
Code Example
const forest = new ForestGenerator( { count: 500000 } );
scene.add( forest.build( terrain ) );