Function boundingRadius

packages/melonjs/src/math/vertex.ts:214–258

(
	src: Float32Array,
	count: number,
	matrix?: ArrayLike<number>,
)

 * @returns the radius of the smallest origin-centered sphere enclosing the vertices
 */
export function boundingRadius(
	src: Float32Array,
	count: number,
	matrix?: ArrayLike<number>,
): number {
	let maxLenSq = 0;
	if (matrix === undefined) {
		for (let i = 0; i < count; i++) {
			const i3 = i * 3;
			const vx = src[i3];
			const vy = src[i3 + 1];
			const vz = src[i3 + 2];
			const lenSq = vx * vx + vy * vy + vz * vz;
			if (lenSq > maxLenSq) {
				maxLenSq = lenSq;
			}
		}
		return Math.sqrt(maxLenSq);
	}

	const m0 = matrix[0];
	const m1 = matrix[1];
	const m2 = matrix[2];
	const m4 = matrix[4];
	const m5 = matrix[5];
	const m6 = matrix[6];
	const m8 = matrix[8];
	const m9 = matrix[9];
	const m10 = matrix[10];

	for (let i = 0; i < count; i++) {
		const i3 = i * 3;
		const vx = src[i3];
		const vy = src[i3 + 1];
		const vz = src[i3 + 2];
		const ox = m0 * vx + m4 * vy + m8 * vz;
		const oy = m1 * vx + m5 * vy + m9 * vz;
		const oz = m2 * vx + m6 * vy + m10 * vz;
		const lenSq = ox * ox + oy * oy + oz * oz;
		if (lenSq > maxLenSq) {
			maxLenSq = lenSq;
		}
	}
	return Math.sqrt(maxLenSq);
}

const _defaultNormal: XYPoint = { x: 0, y: 0 };