Still to do - transients. Then the engine will be deemed complete, and I can lash up a UI, get it onto iOS, turn it into an AUV3, get it on sale, then start on the St Just in Roseland model.
If you want to see this version - Bath Preservation Trust / Bath Museum of Architecture - on the Pi, I can arrange that, but to make it happen you will have to buy it on iOS in enough numbers. Once enough money is raised for the Bath Preservation Trust, I will make it available on the Pi. I haven’t yet decided what ‘enough money’ is, but it will be a sensible amount.