53 lines
2.1 KiB
TypeScript
53 lines
2.1 KiB
TypeScript
import { Vec3 } from "../../../engine/math/Vec3"
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import type { Mesh } from "../../../engine/scene/Mesh"
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import type { Tree, TreeSpecies } from "../Tree"
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import { blob, lerp, limb, TAU, rng } from "./treekit"
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// Oak: short tapered trunk, a couple of branches, a broad cluster of rounded canopy
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// blobs (bushy, wider than tall). Trunk = brown bark, foliage = oak leaf.
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export const oak: TreeSpecies = { kind: "oak", trunk: "bark", foliage: "leaf", build }
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function build(tree: Tree, trunk: Mesh, leaves: Mesh, lod: "full" | "impostor"): void {
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const base = tree.position
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const g = tree.growth
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const rand = rng(tree.seed)
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const h = lerp(0.8, 7, g)
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const rTrunk = lerp(0.04, 0.32, g)
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const forkY = base.y + h * 0.5
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const canopyY = base.y + h * 0.72
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const blobR = h * 0.3
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if (lod === "impostor") {
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// One low-poly blob on a stubby trunk -- reads as an oak at distance.
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limb(trunk, base, { x: base.x, y: forkY, z: base.z }, rTrunk, rTrunk * 0.6, 3)
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blob(leaves, { x: base.x, y: canopyY, z: base.z }, blobR * 1.15, rand, 4, 2)
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return
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}
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limb(trunk, base, { x: base.x, y: forkY, z: base.z }, rTrunk, rTrunk * 0.6, 5)
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const spread = h * 0.32
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// Central blob plus, as it grows, a couple offset ones -> broad bushy crown.
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const blobs = 1 + Math.round(g * 2)
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for (let i = 0; i < blobs; i++) {
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const angle = rand() * TAU
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const rad = i === 0 ? 0 : spread * (0.5 + rand() * 0.5)
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const center = {
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x: base.x + Math.cos(angle) * rad,
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y: canopyY + (rand() - 0.4) * spread,
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z: base.z + Math.sin(angle) * rad,
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}
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blob(leaves, center, blobR * (0.7 + rand() * 0.4), rand)
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}
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// Grown oaks throw out a few branches, each tipped with a leaf tuft.
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if (g > 0.55) {
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const branches = 2 + Math.round(rand())
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for (let i = 0; i < branches; i++) {
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const angle = rand() * TAU
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const dir = Vec3.normalize({ x: Math.cos(angle), y: 1.2, z: Math.sin(angle) })
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const start = { x: base.x, y: base.y + h * 0.42, z: base.z }
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const end = Vec3.add(start, Vec3.scale(dir, h * 0.3))
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limb(trunk, start, end, rTrunk * 0.4, rTrunk * 0.2, 4)
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blob(leaves, end, blobR * 0.6, rand)
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}
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}
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}
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