determing reflection points


I have Apogee Slant 6 speakers and have been room tuning for some time now but... I was wondering how I determine my 1st reflection points (walls & ceiling) since they are bi-polar so that I can better evaluate how to tune better in the future, can the forum members help with suggestions on how to explore this?
rsjm80
Thanks for helping me with that, I think I've got it. additionally, any way to determie reflection points on the ceiling too?
Here's a calculator for floor and ceiling reflections
mehlau.net /audio/ floorbounce