How do you use shadows in mobile games?

Question

C++ / C#

Hello. Actually the question arose.
Mobile games and optimization. As a variant of a pseudo shadow (such as a circle under the hero), but how best to make it, if it's just a texture, then it will fall into the ground in places, on the slopes.
We must take into account that there are characters, cars and the city.

Answer 1

The simplest thing is to use spotlights. But they are not very smart. Look at assetsotre plugins like fast shadow projector.

Answer 2

https://habr.com/ru/company/mailru/blog/243737/
here as a starting point - you can read about planar shadows.) they have a number of limitations, the main of which is that they only project onto a flat plane, but suddenly you fit.
Yes, it's good to know :)