polygonjs-engine/src/core/geometry/util/Shape.ts

node-based webgl 3D engine https://polygonjs.com

import {CoreGeometryUtilCircle} from './Circle';
import {ShapeBufferGeometry} from 'three/src/geometries/ShapeBufferGeometry';
import {Shape} from 'three/src/extras/core/Shape';
import {Vector3} from 'three/src/math/Vector3';

export class CoreGeometryUtilShape {
	static geometry_from_points(positions: Vector3[]) {
		const positions_2d = CoreGeometryUtilCircle.positions(1, positions.length);

		const shape = new Shape();

		const first_position_2d = positions_2d[0];
		shape.moveTo(first_position_2d.x, first_position_2d.y);
		positions_2d.forEach((position_2d, i) => {
			if (i > 0) {
				shape.lineTo(position_2d.x, position_2d.y);
			}
		});

		const geometry = new ShapeBufferGeometry(shape);

		const position_array = geometry.attributes['position'].array as number[];
		positions.forEach(function (position, i) {
			// const position = point.position()
			position_array[3 * i + 0] = position.x;
			position_array[3 * i + 1] = position.y;
			position_array[3 * i + 2] = position.z;
		});

		return geometry;
	}
}