void DrawCross(Matrix world, Color color)
{
var screenPos = camera.Project(Vector3.TransformCoordinate(Vector3.Zero, world), View.Viewport);
View.Draw2DLines(new Vector2[]
{
new Vector2(screenPos.X - 5, screenPos.Y - 5),
new Vector2(screenPos.X + 5, screenPos.Y + 5),
}, color);
View.Draw2DLines(new Vector2[]
{
new Vector2(screenPos.X + 5, screenPos.Y - 5),
new Vector2(screenPos.X - 5, screenPos.Y + 5),
}, color);
}