enableHardwareClipping( planeCount ) {

		this.enableExtension( 'GL_ANGLE_clip_cull_distance', 'require' );

		this.builtins[ 'vertex' ].push( `out float gl_ClipDistance[ ${ planeCount } ]` );

	}
Enables hardware clipping.

@param {string} planeCount - The clipping plane count.