alt Hacker NewsIt's an indie open world game originally released for Stadia and in its original form simply loaded the whole world into memory at boot.
We had to implement a streaming system and figure out a good way of chunking the world. This was a challenge because everything was on water and you could see nearby islands quite far away. An intern called Tommi did a great job identifying a good strategy and writing the system.
We also had to reduce the density and model complexity of a lot of environmental details such as rocks, vegetation, and stuff like pots and clotheslines. This was done largely by sorting things by memory size and frequency of use and identifying outliers.
One of the biggest issues was actually really silly: the journal fetched Portrait images and names of characters by referencing the actual NPC and having them embedded there. Meaning the journal, which was always loaded, would pull every NPC involved in a quest into memory including their behaviors, textures, and models.
On my end I also found a lot of silly details wasting hundreds of megabytes. Special render passes using huge textures and render targets, poor structuring of the render pipeline caused memory increases, several key shaders referenced huge textures which weren't necessary, ...
My blog posts about the project[0] mainly focus on rendering performance because that's where I spent more time and it contains more interesting content for discussion. But reducing memory was an ongoing concern with countless little improvements over the 1.5 year porting process