private bool pixcol(gObj obj){
            Matrix t = obj.m * Matrix.Invert(m) * Matrix.CreateTranslation(0.5f, 0.5f, 0);
            for (int x = 0; x < size.X; ++x) for (int y = 0; y < size.Y; y++)
					{
						if (col[(int)(x + y * size.X)].A == 0) continue;
						Vector2 p = Vector2.Transform(new Vector2(x, y), t);
						{
						int x2 = (int)p.X;
						int y2 = (int)p.Y;
						}
						if (!(!(x2 < 0 || x2 > obj.size.X) && !(y2 < 0 || y2 > obj.size.Y))) continue;
						if (obj.col[(int)(x2 + y2 * obj.size.X)%(obj.size.x*obj.size.y)].A > 0) return true;
					}
            return false;
        }