Publish Forma Engine 0.3.0 source with documentation and CI
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emil28092005
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import {
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entity,
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uid,
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type Vec3,
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type Geometry,
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validateGeometry,
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} from "./schema.ts";
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const cross = (a: number[], b: number[], c: number[]) =>
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(b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
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export function extrude(profile: number[][], depth = 1): Geometry {
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if (
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!Array.isArray(profile) ||
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profile.length < 3 ||
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profile.length > 256 ||
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!Number.isFinite(depth) ||
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depth <= 0 ||
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!profile.every((p) => p.length === 2 && p.every(Number.isFinite))
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)
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throw Error("Нужен простой замкнутый профиль из 3–256 точек");
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const points = profile.map((p) => [...p]);
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let area = points.reduce(
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(s, p, i) =>
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s +
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p[0] * points[(i + 1) % points.length][1] -
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points[(i + 1) % points.length][0] * p[1],
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0,
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);
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if (Math.abs(area) < 1e-8) throw Error("Нулевая площадь");
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if (area < 0) points.reverse();
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const n = points.length;
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for (let i = 0; i < n; i++)
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for (let j = i + 2; j < n; j++) {
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if (i === 0 && j === n - 1) continue;
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const a = points[i],
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b = points[(i + 1) % n],
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c = points[j],
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d = points[(j + 1) % n];
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if (
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cross(a, b, c) * cross(a, b, d) < 0 &&
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cross(c, d, a) * cross(c, d, b) < 0
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)
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throw Error("Профиль пересекает себя");
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}
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const indices: number[] = [],
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left = points.map((_, i) => i);
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let guard = 0;
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while (left.length > 3) {
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let clipped = false;
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for (let j = 0; j < left.length; j++) {
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const a = left[(j + left.length - 1) % left.length],
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b = left[j],
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c = left[(j + 1) % left.length];
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if (cross(points[a], points[b], points[c]) <= 1e-8) continue;
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if (
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left.some(
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(k) =>
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k !== a &&
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k !== b &&
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k !== c &&
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cross(points[a], points[b], points[k]) >= 0 &&
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cross(points[b], points[c], points[k]) >= 0 &&
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cross(points[c], points[a], points[k]) >= 0,
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)
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)
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continue;
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indices.push(a, b, c, a + n, c + n, b + n);
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left.splice(j, 1);
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clipped = true;
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break;
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}
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if (!clipped || guard++ > 256)
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throw Error("Невозможно триангулировать профиль");
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}
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indices.push(
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left[0],
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left[1],
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left[2],
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left[0] + n,
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left[2] + n,
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left[1] + n,
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);
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const positions: number[] = [];
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for (const y of [0, depth])
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for (const [x, z] of points) positions.push(x, y, z);
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for (let i = 0; i < n; i++) {
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const j = (i + 1) % n;
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indices.push(i, i + n, j + n, i, j + n, j);
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}
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const g = { positions, indices };
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validateGeometry(g);
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return g;
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}
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export function lathe(profile: number[][], segments = 24): Geometry {
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if (
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!Number.isInteger(segments) ||
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segments < 3 ||
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segments > 128 ||
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!Array.isArray(profile) ||
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profile.length < 2 ||
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profile.length > 256 ||
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!profile.every(
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(p) => p.length === 2 && p.every(Number.isFinite) && p[0] >= 0,
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)
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)
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throw Error("Нужен профиль [радиус, высота] и 3–128 сегментов");
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const positions: number[] = [],
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indices: number[] = [];
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for (const [r, y] of profile)
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for (let j = 0; j < segments; j++) {
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const a = (j / segments) * Math.PI * 2;
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positions.push(Math.cos(a) * r, y, Math.sin(a) * r);
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}
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for (let i = 0; i < profile.length - 1; i++)
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for (let j = 0; j < segments; j++) {
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const a = i * segments + j,
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b = i * segments + ((j + 1) % segments),
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c = a + segments,
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d = b + segments;
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indices.push(a, c, b, b, c, d);
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}
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const g = { positions, indices };
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validateGeometry(g);
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return g;
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}
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export function transformed(
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g: Geometry,
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offset: Vec3 = [0, 0, 0],
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scale: Vec3 = [1, 1, 1],
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): Geometry {
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const positions = g.positions.map((v, i) => v * scale[i % 3] + offset[i % 3]),
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indices = [...g.indices];
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if (scale[0] * scale[1] * scale[2] < 0)
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for (let i = 0; i < indices.length; i += 3)
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[indices[i + 1], indices[i + 2]] = [indices[i + 2], indices[i + 1]];
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return { positions, indices };
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}
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export function arena({
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width = 22,
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depth = 18,
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seed = 42,
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obstacles = 8,
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}: any = {}) {
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width = Math.max(8, Math.min(80, width));
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depth = Math.max(8, Math.min(80, depth));
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obstacles = Math.max(0, Math.min(80, Math.round(obstacles)));
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let v = seed | 0;
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const random = () => {
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v = (Math.imul(v, 1664525) + 1013904223) | 0;
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return (v >>> 0) / 4294967296;
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};
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const root = entity("Сад · уровень"),
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nodes = [root];
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const add = (
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name: string,
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pos: Vec3,
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size: Vec3,
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color: string,
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type = "box",
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collision = true,
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) => {
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const n = entity(
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name,
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{
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mesh: { type, size },
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material: { color, roughness: 0.92 },
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...(collision
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? { collider: { shape: "box", size }, rigidbody: { type: "fixed" } }
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: {}),
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},
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pos,
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);
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n.parentId = root.id;
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nodes.push(n);
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return n;
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};
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add("Каменное основание", [0, -0.5, 0], [width, 1, depth], "#b6aa91");
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add(
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"Светлый песок",
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[0, 0.025, 0],
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[width - 0.5, 0.05, depth - 0.5],
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"#d1c9ae",
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"box",
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false,
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);
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add("Северная стена", [0, 0.6, depth / 2], [width, 1.2, 0.45], "#b0a48a");
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add("Южная стена", [0, 0.6, -depth / 2], [width, 1.2, 0.45], "#b0a48a");
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add("Западная стена", [-width / 2, 0.6, 0], [0.45, 1.2, depth], "#b0a48a");
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add("Восточная стена", [width / 2, 0.6, 0], [0.45, 1.2, depth], "#b0a48a");
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for (let z = -Math.floor(depth / 2) + 1; z < depth / 2; z += 1.1)
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add(
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"Плитка тропы",
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[0, 0.07, z],
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[1.7, 0.09, 0.9],
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"#b6b49c",
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"box",
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false,
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);
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for (const x of [-width / 2 + 1.2, width / 2 - 1.2])
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for (const z of [-depth / 2 + 1.2, depth / 2 - 1.2]) {
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add("Основание колонны", [x, 0.15, z], [1.4, 0.3, 1.4], "#a9a187");
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add("Колонна", [x, 1.6, z], [0.7, 2.7, 0.7], "#c5bca2", "cylinder");
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add("Капитель", [x, 3, z], [1.2, 0.3, 1.2], "#cfc5ab");
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}
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for (let i = 0; i < obstacles; i++) {
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const x = (i % 2 ? -1 : 1) * (2 + random() * (width / 2 - 4)),
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z = (random() - 0.5) * (depth - 5);
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if (i % 3 === 0) {
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add("Ствол", [x, 0.7, z], [0.25, 1.4, 0.25], "#80765c", "cylinder");
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add("Крона", [x, 1.7, z], [2, 1.7, 2], "#859887", "icosphere", false);
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} else {
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const n = add(
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"Обломок",
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[x, 0.35, z],
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[0.9 + random(), 0.7, 0.8 + random()],
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"#999b84",
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);
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n.transform.rotation[1] = random() * 2;
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}
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}
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return nodes;
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}
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export function character({
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height = 1.8,
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color = "#7d9b8a",
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name = "Персонаж · модель",
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}: any = {}) {
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const root = entity(name),
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nodes = [root],
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scale = height / 1.8;
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const add = (name: string, p: Vec3, size: Vec3, c: string, type = "box") => {
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const n = entity(
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name,
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{
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mesh: { type, size: size.map((v) => v * scale) },
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material: { color: c, roughness: 0.8 },
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},
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p.map((v) => v * scale) as Vec3,
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);
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n.parentId = root.id;
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nodes.push(n);
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};
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add("Торс", [0, 1.1, 0], [0.6, 0.65, 0.35], color);
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add("Голова", [0, 1.65, 0], [0.4, 0.4, 0.4], "#d5b994", "sphere");
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add("Капюшон", [0, 1.8, -0.04], [0.5, 0.25, 0.48], color, "icosphere");
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for (const sign of [-1, 1]) {
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add("Нога", [sign * 0.16, 0.37, 0], [0.24, 0.7, 0.25], "#61685f");
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add("Сапог", [sign * 0.16, 0.09, 0.09], [0.28, 0.18, 0.42], "#55594f");
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add("Рука", [sign * 0.42, 1.05, 0], [0.18, 0.65, 0.2], color);
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}
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add("Клинок", [0.53, 0.98, 0.28], [0.08, 0.85, 0.12], "#c4cac0");
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return nodes;
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}
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