Hello everyone, I'm a long time lurker who is on the verge of completing a mod I've been working on for a couple years. I've run into a very strange performance problem that has me completely stumped and I think I need some help.
This only occurs on the final chapter of my mod when playing completely through in one sitting. It's only about 1-1.5 hours so I expect this to be fairly common. (I hope!) When the final map loads performance drops dramatically (< 10 fps) due to dynamic light rendering according to the +show_budget breakdown, but again this only happens when playing through the whole mod from the beginning (3 map transitions + background map in the main menu). There are no env_projectedtexture lights on, no light_dynamics on, and no normal lights or light_spots with custom appearances on. If the map is loaded directly there are no performance problems. Even more strange, by pure luck I've found out by setting the cvar, r_unloadlightmaps 1, performance is immediately recovered. I can't find any documentation on what exactly this does and it appears to be an engine cvar so I can't look at the code to debug. Sometimes leaving that on for 30 seconds then setting it back to 0 keeps the performance, sometimes it needs 45 seconds, sometimes it needs 90, sometimes it needs more. -Can anyone at valve or on the list help me? -Would anyone know what exactly r_unloadlightmaps does? It seems obvious, but I can't see any difference in any of the lightmaps or lighting. -Can I leave r_unloadlightmaps set to 1 as a work around? I'm still using Source SDK 2007 since I've added hundreds of code changes and I really want to avoid switching to 2013, plus I'm basically done at this point minus this one issue. I've also applied all the code changes to the env_projectedtexture entity as suggested here: https://developer.valvesoftware.com/wiki/Env_projectedtexture/fixes TBH, some of the fixes listed on that page are a bit above my knowledge, I'm afraid I've created some performance or memory leak that way. Thanks! Any help would be greatly appreciated!
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