public Vertex(Vector modelPosition, Vector normal, Point textureMapping, Color color)
{
_position = modelPosition;
_normal = normal;
_mapping = textureMapping;
_color = color;
}
public Vertex()
{
_position = new Vector(0, 0, 0);
_normal = new Vector(0, 0, 0);
_mapping = new Point(0, 0);
_color = new Color(0, 0, 0, 0);
}