I just spent half an hour creating a cars.wad the same as the one I usually use, but with all the lods back in there, and I went back to an un-hacked GP4.EXE that will use them all. The results were interesting, since so many things have changed on my PC (notably getting an Audigy sound card) since I first went LOD_0 only...
I didn't notice a startling difference in PO at the start of a race at Monaco. However, the slow-down before the tunnel entrance had vanished, and I have to say the game felt quicker. So I cranked the reflections up from none to full, and turned the rain on. Amazingly, PO hovered around 115 at the start of a race at Monaco (p3) in very heavy rain, before the first corner where it briefly peaked at 125 (this is all T-cam, BTW), and then settled down to around 90 for the bulk of the lap, with the odd peak above 100. The game never felt smoother in the rain.
All I'm missing now are dynamic environment maps, full video walls, high quality pit crew, etc...
The reflections are worth having in the wet, though. The rest I can live without.
Conclusion? Having all lod_0 cars was inflicting a bigger performance hit than I thought. It's not immediately apparent from PO readings, but the standard scheme for saving on CPU usage by having simplified car models at distances seems to be very effective. To get around the 'morphing' effect at, say, the final straight before the Parabolica at Monza, I aim to increase the cull distance.
Post Edited (02-17-04 01:09)
Haljazz