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refactor: move world concepts into engine

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This commit is contained in:
Toad 2026-08-24 15:17:53 +02:00
parent eeedcb8e48
commit 2d15c7ab8d
52 changed files with 3298 additions and 1558 deletions
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66
game/actors/trees/Birch.ts
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@ -1,15 +1,51 @@
import { Vec3 } from "../../../engine/math/Vec3"
import type { Mesh } from "../../../engine/scene/Mesh"
import type { Tree, TreeSpecies } from "../Tree"
import type { Material } from "../../../engine/render/Material"
import type { Prefab } from "../../../engine/scene/Prefab"
import type { Tree } from "../Tree"
import { blob, lerp, limb, TAU, rng } from "./treekit"
// Silver birch: tall, slender, near-straight trunk under an airy, high, slightly
// drooping canopy -- a lean silhouette between the broad oak and conical spruce.
// Trunk = white birch bark, foliage = oak leaf (the white trunk carries the read).
export const birch: TreeSpecies = { kind: "birch", trunk: "birch", foliage: "leaf", build }
export type Birch = Prefab<Tree>
function build(tree: Tree, trunk: Mesh, leaves: Mesh, lod: "full" | "impostor"): void {
export namespace Birch {
export function create(trunk: Material, foliage: Material): Birch {
return {
position: (tree) => tree.position,
bakeNear: (tree, batch) =>
build(tree, batch.mesh(trunk), batch.mesh(foliage), "full"),
bakeFar: (tree, batch) =>
build(tree, batch.mesh(trunk), batch.mesh(foliage), "impostor"),
collider: treeCollider,
}
}
function treeCollider(tree: Tree) {
if (tree.growth <= 0.35) {
return null
}
const radius = tree.growth * 0.2 + 0.15
return {
shape: "box" as const,
minX: tree.position.x - radius,
maxX: tree.position.x + radius,
minZ: tree.position.z - radius,
maxZ: tree.position.z + radius,
top: tree.position.y + 3,
standable: false,
}
}
}
function build(
tree: Tree,
trunk: Mesh,
leaves: Mesh,
lod: "full" | "impostor",
): void {
const base = tree.position
const g = tree.growth
const rand = rng(tree.seed)
@ -18,11 +54,25 @@ function build(tree: Tree, trunk: Mesh, leaves: Mesh, lod: "full" | "impostor"):
const canopyY = base.y + h * 0.75
const blobR = h * 0.22
if (lod === "impostor") {
limb(trunk, base, { x: base.x, y: base.y + h * 0.9, z: base.z }, rTrunk, rTrunk * 0.5, 3)
limb(
trunk,
base,
{ x: base.x, y: base.y + h * 0.9, z: base.z },
rTrunk,
rTrunk * 0.5,
3,
)
blob(leaves, { x: base.x, y: canopyY, z: base.z }, blobR * 1.1, rand, 4, 2)
return
}
limb(trunk, base, { x: base.x, y: base.y + h * 0.88, z: base.z }, rTrunk, rTrunk * 0.35, 5)
limb(
trunk,
base,
{ x: base.x, y: base.y + h * 0.88, z: base.z },
rTrunk,
rTrunk * 0.35,
5,
)
const spread = h * 0.22
// Sparse small blobs clustered high, biased downward so the crown droops.
@ -42,7 +92,11 @@ function build(tree: Tree, trunk: Mesh, leaves: Mesh, lod: "full" | "impostor"):
const branches = 2 + Math.round(rand())
for (let i = 0; i < branches; i++) {
const angle = rand() * TAU
const dir = Vec3.normalize({ x: Math.cos(angle), y: 0.6, z: Math.sin(angle) })
const dir = Vec3.normalize({
x: Math.cos(angle),
y: 0.6,
z: Math.sin(angle),
})
const start = { x: base.x, y: base.y + h * 0.7, z: base.z }
const end = Vec3.add(start, Vec3.scale(dir, h * 0.22))
limb(trunk, start, end, rTrunk * 0.4, rTrunk * 0.15, 4)