I'm laying out a place that is not intended to be released or playable, I'm basically using Hammer instead of Sketchup, 3ds Max or whatever else. After creating the basic rooms (very simple place) I began populating it with prefabs, the place is a library so I used a lot of bookcases (you know which one).
Eventually Hammer slowed to a crawl and it got harder to edit the map with it. Then, when compiling I got the following:
Error: Exceeded MAX_MAP_VERTS
Description: The maximum number of vertices for a map has been reached
Howto Fix: The map is too complex for the game engine/compile tools to handle. Simplify
I realized then that prefabs are added as world brushes and thought that was the problem. So I began converting the bookcases to func_wall entities. But the problem persists. I even tried making them func_detail and func_illusionary, no luck. I was under the impression that entities do not count against the brush limit (right now map information window shows 8734 solids, 51139 faces).
I deleted a bunch of prefabs and finally got it to compile with ~6000 solids or so. Now I'm thinking about making my own bookcase by removing unnecessary detail, but I'm still curious. Am I missing something?