these decals behind the fence also went missing in Anniversary. (also the flashlight is strangely dimmer? but the flashlight code is awful don't waste your time on that)

Was looking into a discrepancy with Half-Life 2 decals in noclip and tracked down the cause to... well, in the Anniversary Edition, these vines in d1_town_01 were ported from infodecals to overlays, but their placement was accidentally moved. Left is original game, right is Anniversary.

Was anybody else aware of this weird softlock prevention trigger in Portal 1? Wonder what the softlock was.

The more time I invest into debug tools, the happier I am. If you don't have some debug line drawing in your renderer, spend the time and add it today. Things like depth tinting and line thickness just make the experience of visualizing problems much nicer and easier.