/**
 * 📐 AR Projection Utilities
 * Common logic for projecting 3D marker-space points to 2D screen CSS pixels.
 */
/**
 * Projects a 3D marker-space point (x, y, z) into 2D screen coordinates.
 *
 * @param {number} x - Marker X coordinate
 * @param {number} y - Marker Y coordinate
 * @param {number} z - Marker Z coordinate (height from surface)
 * @param {number[][]} mVT - ModelViewTransform matrix (3x4)
 * @param {number[][]} proj - Projection matrix (3x3)
 * @param {number} videoW - Internal video width
 * @param {number} videoH - Internal video height
 * @param {Object} containerRect - {width, height} of the display container
 * @param {boolean} needsRotation - Whether the feed needs 90deg rotation (e.g. portrait mobile)
 * @returns {{sx: number, sy: number}} Screen coordinates [X, Y]
 */
export function projectToScreen(x: number, y: number, z: number, mVT: number[][], proj: number[][], videoW: number, videoH: number, containerRect: Object, needsRotation?: boolean): {
    sx: number;
    sy: number;
};