void addVert(Vector2 position)
{
var index = _vertices.length;
_vertices.ensureCapacity();
_vertices.buffer[index].Position = position.toVector3();
_vertices.buffer[index].TextureCoordinate = position;
_vertices.length++;
}
void addVert(Vector3 position, Vector2 texCoord)
{
var index = _vertices.length;
_vertices.ensureCapacity();
_vertices.buffer[index].Position = position;
_vertices.buffer[index].TextureCoordinate = texCoord;
_vertices.length++;
}