Hello.
My problem is simple… if I try to use a spot light through a window to make the halo pass through it… it passes alright, but it passes through the wall and through everything…
my settings were Ray shadow and halo… any help please 
Hi.
I’m just bookmarking you for my next network session.
Unless someone else answers first, (if they do. Great!). I’ll be back.
Cig.
Set Spot Property as follows:
Lamp >
Spot
Shadows >
Buffer Shadow
Buffer Type: Classic-Half
Sample Buffers: Size at 1024
Clip Start and End: adjust as needed
Spot Shape >
Check Halo
Step: around 12