public int CreateVertexChannel <T>(string usage)
{
if (_finishedMesh)
{
throw new InvalidOperationException("This MeshBuilder can no longer be used because FinishMesh has been called.");
}
if (_finishedCreation)
{
throw new InvalidOperationException("Functions starting with 'Create' must be called before calling AddTriangleVertex");
}
var channel = new VertexChannel <T>(usage);
_vertexChannels.Add(channel);
_vertexChannelData.Add(default(T));
_currentGeometryContent.Vertices.Channels.Add <T>(usage, null);
return(_vertexChannels.Count - 1);
}
/// <summary>
/// Initializes a new instance of IndirectPositionCollection.
/// </summary>
internal IndirectPositionCollection(GeometryContent geom, VertexChannel <int> positionIndices)
{
_geometry = geom;
_positionIndices = positionIndices;
}
/// <summary>
/// Constructs a VertexContent instance.
/// </summary>
internal VertexContent(GeometryContent geom)
{
positionIndices = new VertexChannel <int>("PositionIndices");
positions = new IndirectPositionCollection(geom, positionIndices);
channels = new VertexChannelCollection(this);
}
internal IndirectPositionCollection(GeometryContent geometry, VertexChannel <int> positionIndices)
{
this.geometry = geometry;
this.positionIndices = positionIndices;
}
/// <summary>
/// Constructs a VertexContent instance.
/// </summary>
internal VertexContent()
{
channels = new VertexChannelCollection(this);
positionIndices = new VertexChannel <int>("PositionIndices");
positions = new IndirectPositionCollection();
}
