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

PlayCanvas WebGL game engine

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 };