struct BoundingBox2D { float x, y, w, h; };

bool GetPlayerBoundingBox(Vector3 headWorld, Vector3 feetWorld, const Matrix4x4& vMatrix, BoundingBox2D& outBox) {
    Vector2 headScreen, feetScreen;
    if (!WorldToScreen(headWorld, headScreen, vMatrix) || !WorldToScreen(feetWorld, feetScreen, vMatrix)) return false;
    
    float height = feetScreen.y - headScreen.y;
    float width = height * 0.45f; // Standard character aspect ratio
    
    outBox.x = headScreen.x - (width * 0.5f);
    outBox.y = headScreen.y;
    outBox.w = width;
    outBox.h = height;
    return true;
}