What game engine does Rock star games use?

Questions & Answers
1

i was trying to make a tree on unity the size an quality of the picture dont matter
the texture looks bad. WHY!!!

3

If it looks bad, it’s not Unity’s fault, it’s yours. Just think, Rockstar have hundreds of artists, drawing pictures of tree textures all day every day. And Rockstar won’t be using an engine you can buy - they’ll have written their own (probably.)

Harsh I know, but Unity is only limited by YOU.

4

This isn’t a Unity question. Google is your friend …
http://en.wikipedia.org/wiki/Rockstar_Advanced_Game_Engine

2

Model your own tree. Roll your own textures. Write your own shaders.

Unity will handle it all fine and is capable of showing extremely high quality.