When comparing Terasology vs Xonotic, the Slant community recommends Xonotic for most people. In the question“What are the best open-source games?” Xonotic is ranked 2nd while Terasology is ranked 79th. The most important reason people chose Xonotic is:
Open Source games are not always known for their high-quality graphics. This can often be caused by the games being designed by committee in that many different people may work on the graphics, even in the same areas, which can cause plenty of inconsistencies. Luckily, Xonotic does not suffer from this problem as the whole of the game has consistent looks that are actually quite impressive.
Specs
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Pros
Pro Well written in Java
Java is well documented.
Pro Nice looking
Shaders, bloom, film grain and other effects can be enabled.
Pro Free sandbox alternative
The game is inspired by other titles like Minecraft and Dwarf Fortress.
Pro Fully moddable
In the game you can create a mod and submit it as a module. You can select multiple modules when you make a new world.
Pro Extremely modular
The engine allows mix-and-match of features that you need.
Pro Active community
The community is very active in the development of the game, they participate regularly to Google Summer of Code and Google Code In.
Pro Can be Minecraft competitor
An open source alternative, fully customizable; easy mod support based on module pieces.
Pro Impressive graphics, especially for an open source game
Open Source games are not always known for their high-quality graphics. This can often be caused by the games being designed by committee in that many different people may work on the graphics, even in the same areas, which can cause plenty of inconsistencies. Luckily, Xonotic does not suffer from this problem as the whole of the game has consistent looks that are actually quite impressive.
Pro Cross platform
Mac/Linux/Windows support.
Pro Many game modes
Includes all the expected options like Deathmatch and Capture the Flag, as well as more novel modes like Key Hunt.
Pro Fast-paced action
Pro Interesting weapon design (for an arena shooter)
All arena shooter basically use Quake or UT weapon system. However, Xonotic has an interesting variety of weapons (larger selection than most) with elements from both UT and Quake but added some of their innovative ideas. Some of the weapons have a bit of overlap and felt a bit forced, but other weapons really made the game stand out.
Pro Play easily online
At any time, you can find people playing on the net. No special configuration needed.
Pro Not demanding on the system
On integrated HD4600 graphics ~120 FPS on normal settings.
Pro Multiple floor levels gameplay
The game permits players to move across multiple floor levels, which permits more dynamic game play.
Cons
Con Buggy
Con Unstable
Con Slow
Con Campaign can be very hard and you can get stuck
Some levels are very strange and difficult like fighting with almost invisible enemies.
Even at easy they are hard to beat and you must beat them in order to progress in campaign.
Con Few players
Very few players on the servers ate as it happens 5-9 people!
Con Boring AI bots
Bots are not the most performant opponents in Xonotic. They often run around the same paths, and sometimes even stand still on spots for apparently no reason.
Con No actual addons repository
Cannot download custom maps through the actual game. Instead you have to download maps online and then put them in a directory.