Vertex structures

Vertex structures can be created, but because of differing platform padding an absolute offset must be set for every field, and the structure must have explicit layout.

Example:

[StructLayout(LayoutKind.Explicit, Size = 32)]
public struct PositionNormalTexCoord
{
    public static readonly VertexDescriptor Descriptor = VertexDescriptor.Create<PositionNormalTexCoord>();
    [FieldOffset(0)]
    public Vector3f Position;
    [FieldOffset(12)]
    public Vector3f Normal;
    [FieldOffset(24)]
    public Vector2f TexCoord;
}

Notice the static Descriptor field.

Vertex descriptors

Vertex descriptors describe the different fields of a structure and is used to map fields in a vertex array. They can be created manually, but there should really be little reason to do so. To automatically create a vertex descriptor from a structure type use VertexDescriptor.Create<T>().