You can't have superp settings for all situations with these 3 values!!!
Those are the distances of the shadow cascades.
So in AC the shadows, or better the shadows resolution, or better the resulution of the sun light processing on track objects is splitted into 3 or 4 parts. Also the resolution within such a cascade is dynamic, dependend on the range from one to another cascade.
So the first one (the nearest one) has the biggest resolution. It is the resulotion you set for the shadows in the AC video settings.
So the higher a value is there, the more distant the next shadow cascade is, but you will also lower resolution if you widen the cascade distance.
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So the quality of shadows in AC is always balanced to reduce the load on the GPU.
You can set it very high quality, but only with the cost of being very rough in the distance or vise versa.
The only way to have overall superb quality is to set the 3rd value very big and set shadows resolution to the highest possible.
And you have many many optimization methods in AC to bypass the shadows rendering, because it is always heavy. So you might see sudden unshadowed things out of a certain FOV.
So sunlight light processing is the most GPU heavy render thing and thats why there are so many methods to minimize the load.
Because noone will understand it, that for good shadows your fps will massively go down.
Here are settings for very good shadows:
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But with a very high GPU load!
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