/**
 * Geometry utility functions
 * Core geometric calculations without UI dependencies
 */
import { Vector3 } from '../core/modeling/transform';
import { Vector2 } from '../core/geometry/mesh_face';
/**
 * Calculate distance between two 3D points
 */
export declare function distance3D(p1: Vector3, p2: Vector3): number;
/**
 * Calculate distance squared (faster, no sqrt)
 */
export declare function distanceSquared3D(p1: Vector3, p2: Vector3): number;
/**
 * Calculate distance between two 2D points
 */
export declare function distance2D(p1: Vector2, p2: Vector2): number;
/**
 * Normalize a 3D vector
 */
export declare function normalize3D(v: Vector3): Vector3;
/**
 * Normalize a 2D vector
 */
export declare function normalize2D(v: Vector2): Vector2;
/**
 * Dot product of two 3D vectors
 */
export declare function dot3D(v1: Vector3, v2: Vector3): number;
/**
 * Cross product of two 3D vectors
 */
export declare function cross3D(v1: Vector3, v2: Vector3): Vector3;
/**
 * Calculate face normal from three vertices
 */
export declare function calculateFaceNormal(v1: Vector3, v2: Vector3, v3: Vector3): Vector3;
/**
 * Check if a point is inside a triangle (2D)
 */
export declare function pointInTriangle(point: Vector2, v1: Vector2, v2: Vector2, v3: Vector2): boolean;
/**
 * Check if a point is inside a polygon (2D)
 */
export declare function pointInPolygon(point: Vector2, polygon: Vector2[]): boolean;
/**
 * Calculate center point of multiple vertices
 */
export declare function calculateCenter(vertices: Vector3[]): Vector3;
/**
 * Calculate bounding box of vertices
 */
export declare function calculateBoundingBox(vertices: Vector3[]): {
    min: Vector3;
    max: Vector3;
    center: Vector3;
    size: Vector3;
};
/**
 * Check if two line segments intersect (2D)
 */
export declare function lineSegmentsIntersect(p1: Vector2, p2: Vector2, p3: Vector2, p4: Vector2): boolean;
/**
 * Calculate angle between two vectors (in radians)
 */
export declare function angleBetweenVectors(v1: Vector3, v2: Vector3): number;
/**
 * Project a 3D point onto a plane
 */
export declare function projectPointOntoPlane(point: Vector3, planePoint: Vector3, planeNormal: Vector3): Vector3;
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