I am talking about turning the ambience of the textures down when making tree renders to make into tubes. If you don't, you will get a flatness like a magazine cutout when sprayed into your render. The ambient light in your final pic is up to you or what's needed for the image. I am mainly talking about adjusting things so that the 2D and 3D match. These not only work for real far away things but I've used them for relatively close up stuff as well. Here is an example. There are no real vegetation meshes in this image. Just sprayed renders. It's not great but it's not bad either.