I know that all of us probably know what they are and what they are used for. But recently I was working with them more and now
I think that we can use them more.
As you know they are mentioned in load.ini file of every map in line:
[LIGHT]
LandLight = LandLight.mat
CloudShadows = CloudShadows.mat
I would suggest that when making a map and load.ini file for your map you move them in your textures folder. You can even change the names, important is the correct path to them and what says in them (BTW I think its good way to do also if you are using your own clouds for the map)
I did it like this:
[LIGHT]
LandLight = Avala/serbia/Zemlja.mat
CloudShadows = Avala/serbia/Senke.mat
In this way no one can mess with your map settings and you can fine tune your map and show people exactly what you intend to show them.
In 4.10 patch "the default" maps like Slovakia and Bessarabia can't be tuned by changes in "LandLight.mat and CloudShadows.mat" like we did before. (moded maps can) So, my guess would be that TD realize (or just stole the idea) that maps are looking better, and just move the files somewhere (but we cannot know this for sure until we see those map's load.ini files).
What those files are changing? As far as I have noticed:
LandLight.mat:
Ambient
This line determines the lighting and contrast on the ground (don't forget that the ground is 3D object, just like the planes). When you increase the number behind it, your ground textures are getting brighter and your ground is getting less contrasted, more dull. Map looks less relief. When you decrease the number, your textures are getting darker and you overall ground is getting darker. But map has more visible contrasts on the 3D mesh. For example side of the mountain which is in shadow, or side of the gorge which is in shadow will be more darker, and that brings more contrast to the ground. Ground looks more relief, more 3D, more realistic.
Diffuse
This line works more with colors on ground textures. When you increase the number behind it your textures for the ground are getting more brighter and intensive in colors. When you decrease it, textures are getting more darker with less intensive colors on them. In my opinion its best to set it in contrast with "Ambient" line. Dark "Ambient" (and you will have shadows darker) and bright "Diffuse" (you will have side of the mountain which is in the sun more brighter) and in that way overall better looking map. With this, I think that there is no more need for so many texture tunings in photoshop.
CloudShadows.mat
Has only one line:
Diffuse
Which determines intensity of the clouds shadows on the ground. Bigger the number, darker shadows. Be careful, I think that shadows actually does affect performance, while "LandLight.mat" does not affect performance at all.
I have these screenshots just as a example, but you can see it for yourself how it is really working (and looking) only if you try it on your own maps which you know the best, and in that way you will see the differences the best. I can guaranty that you will be surprised how your maps are looking more 3D with more realistic geography.
Time on all screenshots are 16:30.