/// <inheritdoc/>
public abstract T this[Topology.HalfEdge e] { get; set; }
/// <inheritdoc/>
public override T this[Topology.HalfEdge e]
{
get { return constant; }
set { throw new NotSupportedException("Values of a constant vertex attribute cannot be changed."); }
}
/// <summary>
/// Accesses the vertex attribute value in the array corresponding to the vertex of the given edge.
/// </summary>
/// <param name="e">The edge whose vertex's attribute value is to be accessed.</param>
/// <returns>The vertex attribute value corresponding to the vertex of the given edge.</returns>
public T this[Topology.HalfEdge e]
{
get { return array[e.vertex.index]; }
set { array[e.vertex.index] = value; }
}
/// <summary>
/// Lookup the attribute value for the vertex of the edge indicated, wrapping according to the attribute's surface if necessary.
/// </summary>
/// <param name="e">The edge whose vertex's attribute value is desired.</param>
/// <returns>The attribute value for the vertex of the edge indicated, relative to the edge.</returns>
/// <remarks><para>To get the raw value unwrapped, see <see cref="P:MakeIt.Tile.VertexArrayAttribute`1.Item(MakeIt.Tile.Topology.Vertex)"/></para></remarks>
public override Vector3 this[Topology.HalfEdge e]
{
get { return(surface.OffsetEdgeToVertAttribute(array[e.vertex.index], e.wrap)); }
set { array[e.vertex.index] = surface.ReverseOffsetEdgeToVertAttribute(array[e.vertex.index], e.wrap); }
}
