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

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

import { SphereGeometry } from "./sphere-geometry.js";
class DomeGeometry extends SphereGeometry {
	constructor(opts = {}) {
		const radius = 0.5;
		const latitudeBands = opts.latitudeBands ?? 16;
		const longitudeBands = opts.longitudeBands ?? 16;
		super({
			radius,
			latitudeBands,
			longitudeBands
		});
		const bottomLimit = 0.1;
		const curvatureRadius = 0.95;
		const curvatureRadiusSq = curvatureRadius * curvatureRadius;
		const positions = this.positions;
		for (let i = 0; i < positions.length; i += 3) {
			const x = positions[i] / radius;
			let y = positions[i + 1] / radius;
			const z = positions[i + 2] / radius;
			if (y < 0) {
				y *= 0.3;
				if (x * x + z * z < curvatureRadiusSq) {
					y = -bottomLimit;
				}
			}
			y += bottomLimit;
			y *= radius;
			positions[i + 1] = y;
		}
	}
}
export {
	DomeGeometry
};