>>723090572 (OP)
The way I understand it, old games would cheat and do it the brutal way: literally make a reverse world behind the glass.
They would sneakily reduce the size of the area to stay within budget, and it would not look bad because light simulation was very limited, if not plain ambient light.
But today's game have stuff like dynamic light simulation from multiple sources. Many objects are fully physicalized, if not destructible.
The method they used before wouldn't work and the solution that work would require to basically run the game twice.
