I have situation like this. The ground has a blue material on it. And there are spotlights pointing towards the ground. Now, as you can see in the example bellow, spotlights cannot be seen. If the color of the ground material is white though (you can uncomment line 23), the spotlights color appear.
So I am wondering, how can I achieve that the ground remains blue and that there are colored spotlight visible on top of that. If that’s not possible, what would be the way to achieve this effect?