It's going well.
I completed the new "optimiser" which precomputes which objects are visible from any point on the path. It uses a higher resolution and a much better rendering method to correctly detect what is visible, so there is now very little popup of objects, holes in the road and so on. I plan to release updated object visibility files for the current tracks. Probably in a test patch before Westhill is ready.
I've just written a new thing for open configurations which can start on a path (instead of using no paths at all) and then switch between paths when you go off the edge of one and onto another. The result of this is higher frame rate on open configs, because it can use the optimiser. Also the echo map is available. Still need to do the lightmaps, so cars go darker when they are in shadowed places. This was really vital for the new Westhill as it has all the access roads which are fun to drive on, but the frame rate was too low without the use of the optimiser. Eric is creating dummy paths for the access roads, so they are not selectable as configurations but the paths are available for open configs.
So it's all going well. Obviously these things aren't done by magic and they take time, but we like working and we like what we are working on. So for us it looks good.