setFromSphericalCoords( radius, phi, theta ) {

		const sinPhiRadius = Math.sin( phi ) * radius;

		this.x = sinPhiRadius * Math.sin( theta );
		this.y = Math.cos( phi ) * radius;
		this.z = sinPhiRadius * Math.cos( theta );

		return this;

	}
Sets the vector components from the given spherical coordinates.

@param {number} radius - The radius.
@param {number} phi - The phi angle in radians.
@param {number} theta - The theta angle in radians.
@return {Vector3} A reference to this vector.