example/threejs/asset/three.js
function inclination( vector ) {

		return Math.atan2( - vector.y, Math.sqrt( ( vector.x * vector.x ) + ( vector.z * vector.z ) ) );

	}
function inclination( vector ) {

		return Math.atan2( - vector.y, Math.sqrt( ( vector.x * vector.x ) + ( vector.z * vector.z ) ) );

	}
function inclination ( vector ) { return Math . atan2 ( - vector . y , Math . sqrt ( ( vector . x * vector . x ) + ( vector . z * vector . z ) ) ) ; }
Angle above the XZ plane.
Angle above the XZ plane .