Impulse response generators

I have had this idea bouncing around in my head to put together an impulse response generator based on 3d models and on some googling have discovered there are a few research papers on the topic. The papers seem to talk about modelling based on geometry as though it's old hat, so I started to search for what is out there already. I found Voxengo Impulse Response Modeler and RaySpace, which are in the same vein as what I have in mind but I was wondering if there are any others like this?

Thanks