Пример #1
0
        /// <summary>
        /// Returns the 3D point that the user most likely clicked on.
        /// Returns the closest intersection with a mesh, if possible.
        /// If useClosestMeshIfPossible is true it will otherwise returns the mesh vertex that is closest to the clicked 2D screen coordinate, if possible.
        /// Returns the unprojected position otherwise.
        /// Also returns the 2D point corresponding to the returned 3D point.
        /// </summary>
        /// <param name="position"> The point in screen coordinates to calculate the closest vertices for. </param>
        /// <param name="useClosestMeshIfPossible"> When true the closest vertex point to the clicked position will be used when no mesh is hit at the exact mouse cursor area.</param>
        public NearestPointInCamera CalculateMouseDownNearestPoint(Point position, bool useClosestMeshIfPossible)
        {
            if (mViewPort3D.FindNearest(position, out Point3D nearestPoint, out _, out _))
            {
                return(new NearestPointInCamera(position, nearestPoint));
            }

            if (useClosestMeshIfPossible)
            {
                ClosestVertexResult closestResult = ResultOfClosestPointHit2D(position);
                if (closestResult != null)
                {
                    return(new NearestPointInCamera(closestResult.ClosestPointIn2D, closestResult.ClosestPoint));
                }
            }

            Point3D?unprojectedPosition = mViewPort3D.UnProject(position);

            return(new NearestPointInCamera(position, unprojectedPosition));
        }