Math3D Full Project API
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    PrincipalCurvatureResult: PrincipalCurvatureScalars & {
        dir1: THREE.Vector3;
        dir2: THREE.Vector3;
        normal: THREE.Vector3;
        point: THREE.Vector3;
        uvDir1: { du: number; dv: number };
        uvDir2: { du: number; dv: number };
    }