playcanvas/build/playcanvas/src/scene/geometry/plane-geometry.js

Open-source WebGL/WebGPU 3D engine for the web

import { Vec2 } from "../../core/math/vec2.js";
import { calculateTangents } from "./geometry-utils.js";
import { Geometry } from "./geometry.js";
class PlaneGeometry extends Geometry {
	constructor(opts = {}) {
		super();
		const he = opts.halfExtents ?? new Vec2(0.5, 0.5);
		const ws = opts.widthSegments ?? 5;
		const ls = opts.lengthSegments ?? 5;
		const positions = [];
		const normals = [];
		const uvs = [];
		const indices = [];
		let vcounter = 0;
		for (let i = 0; i <= ws; i++) {
			for (let j = 0; j <= ls; j++) {
				const x = -he.x + 2 * he.x * i / ws;
				const y = 0;
				const z = -(-he.y + 2 * he.y * j / ls);
				const u = i / ws;
				const v = j / ls;
				positions.push(x, y, z);
				normals.push(0, 1, 0);
				uvs.push(u, 1 - v);
				if (i < ws && j < ls) {
					indices.push(vcounter + ls + 1, vcounter + 1, vcounter);
					indices.push(vcounter + ls + 1, vcounter + ls + 2, vcounter + 1);
				}
				vcounter++;
			}
		}
		this.positions = positions;
		this.normals = normals;
		this.uvs = uvs;
		this.uvs1 = uvs;
		this.indices = indices;
		if (opts.calculateTangents) {
			this.tangents = calculateTangents(positions, normals, uvs, indices);
		}
	}
}
export {
	PlaneGeometry
};