Ray Tracing Tool

Not sure if this is old news or not, but I've just discovered a pretty handy tool for quick horizontal ray tracing: https://amcoustics.com/tools/amray It seems a little buggy, for example if you try to zoom it will only zoom out but not in... if someone knows what I'm doing wrong please let me know! But in general it's a very quick and easy to use. I would recommend reading the help menu first. Anyway, hope it's useful! Paul