{ // update circle stuff
				const circleRadiusLabel2 = this.circleRadiusLabel2; //둘레 추가수정
				const circleRadiusLabel = this.circleRadiusLabel;
				const circleRadiusLine = this.circleRadiusLine;
				const circleLine = this.circleLine;
				const circleCenter = this.circleCenter;


				const circleOkay = this.points.length === 3;


				circleRadiusLabel2.visible = this.showCircle && circleOkay; //둘레 추가수정
				circleRadiusLabel.visible = this.showCircle && circleOkay;
				
				circleRadiusLine.visible = this.showCircle && circleOkay;
				circleLine.visible = this.showCircle && circleOkay;
				circleCenter.visible = this.showCircle && circleOkay;


				if(this.showCircle && circleOkay){


					const A = this.points[0].position;
					const B = this.points[1].position;
					const C = this.points[2].position;
					const AB = B.clone().sub(A);
					const AC = C.clone().sub(A);
					const N = AC.clone().cross(AB).normalize();


					const center = Potree.Utils.computeCircleCenter(A, B, C);
					const radius = center.distanceTo(A);
					const circumference = 2 * Math.PI * radius; //둘레 추가 수정


					const scale = radius / 20;
					circleCenter.position.copy(center);
					circleCenter.scale.set(scale, scale, scale);


					//circleRadiusLine.geometry.vertices[0].set(0, 0, 0);
					//circleRadiusLine.geometry.vertices[1].copy(B.clone().sub(center));


					circleRadiusLine.geometry.setPositions( [
						0, 0, 0,
						...B.clone().sub(center).toArray()
					] );


					circleRadiusLine.geometry.verticesNeedUpdate = true;
					circleRadiusLine.geometry.computeBoundingSphere();
					circleRadiusLine.position.copy(center);
					circleRadiusLine.computeLineDistances();


					const target = center.clone().add(N);
					circleLine.position.copy(center);
					circleLine.scale.set(radius, radius, radius);
					circleLine.lookAt(target);
					
					circleRadiusLabel.visible = true;
					circleRadiusLabel.position.copy(center.clone().add(B).multiplyScalar(0.5));
					circleRadiusLabel.setText(`${radius.toFixed(3)} m`); //단위 추가 수정
					
					//둘레 추가수정
					circleRadiusLabel2.visible = true; 
					circleRadiusLabel2.position.copy(center);
					circleRadiusLabel2.setText(`${circumference.toFixed(3)} m`); //단위 추가 수정


				}
			}

<?php
/*
include_once('./_common.php');
if ($is_guest) {
    echo "<script>
            alert('접근 권한이 없습니다.');
            window.location.href = '" . G5_URL . "';
          </script>";
    exit;
}
*/
// PHP를 사용하여 iframe 내부에서 불러온 것인지 확인
if (isset($_SERVER['HTTP_REFERER'])) {
    $referrer = $_SERVER['HTTP_REFERER'];
    $host = parse_url($referrer, PHP_URL_HOST);
    
    // 허용된 도메인인지 확인
    if ($host !== '3dtreemaster.com') {
        // 허용된 도메인이 아니면 접근 차단
        header('Location: https://3dtreemaster.com');
        exit;
    }
} else {
    // HTTP_REFERER가 설정되지 않은 경우 리다이렉트 (직접 접근)
    header('Location: https://3dtreemaster.com');
    exit;
}
?>