/// <summary>
/// Returns the position of the nearest vertex.
/// </summary>
/// <returns>
/// Position of the nearest vertex.
/// </returns>
///
/// <param name="grid">
/// The rectangular grid instance.
/// </param>
/// <param name="point">
/// Point in world space.
/// </param>
/// <param name="system">
/// Coordinate system to use.
/// </param>
///
/// <remarks>
/// Returns the position of the nearest vertex from a given point in
/// either grid- or world space.
/// </remarks>
public static Vector3 NearestVertex(this SphereGrid grid, Vector3 point, CoordinateSystem system)
{
var gridVertex = RoundPoint(grid.WorldToGrid(point));
if (system == CoordinateSystem.Grid)
{
return(gridVertex);
}
return(system == CoordinateSystem.World ? grid.GridToWorld(gridVertex)
: grid.GridToSpheric(gridVertex));
}
/// <summary>
/// Returns the grid position of the nearest box.
/// </summary>
/// <returns>
/// Grid position of the nearest box.
/// </returns>
/// <param name="grid">
/// The rectangular grid instance.
/// </param>
/// <param name="point">
/// Point in world space.
/// </param>
/// <param name="system">
/// Coordinate system to use.
/// </param>
/// <remarks>
/// <para>
/// returns the coordinates of a cell in the grid. Since cell lies
/// between vertices all three values will always have +0.5
/// compared to vertex coordinates.
/// </para>
/// </remarks>
/// <example>
/// <code>
/// GFRectGrid myGrid;
/// Vector3 worldPoint;
/// // something like (2.5, -1.5, 3.5)
/// Vector3 box = myGrid.NearestBoxG(worldPoint);
/// </code>
/// </example>
public static Vector3 NearestCell(this SphereGrid grid,
Vector3 point,
CoordinateSystem system)
{
var gridCell = RoundPoint(grid.WorldToGrid(point) - 0.5f * Vector3.one) + 0.5f * Vector3.one;
if (system == CoordinateSystem.Grid)
{
return(gridCell);
}
return(system == CoordinateSystem.World ? grid.GridToWorld(gridCell)
: grid.GridToSpheric(gridCell));
}