用THREE.Shape画二维圆角矩形

function roundedRect( shape, x, y, width, height, radius ) {
			shape.moveTo( x, y + radius );
			shape.lineTo( x, y + height - radius );
			shape.quadraticCurveTo( x, y + height, x + radius, y + height );
			shape.lineTo( x + width - radius, y + height) ;
			shape.quadraticCurveTo( x + width, y + height, x + width, y + height - radius );
			shape.lineTo( x + width, y + radius );
			shape.quadraticCurveTo( x + width, y, x + width - radius, y );
			shape.lineTo( x + radius, y );
			shape.quadraticCurveTo( x, y, x, y + radius );

            return shape
		}