I was using other textures such as mirror and common portal so I tried the exact one on that page the sfx/portal_sfx and I still just get a mirror image in the portal.
The portal in q3dm7 is part of a larger model. I'll have to figure out how to ungroup the model so I can look at the texture on the portal there.
Although the the original pre-compiled q3dm7 has the working effect I want. So it's a matter of figuring out where I am differing from that.
I even put the portal model from q3dm7 in my little map and I just get a mirror effect.
It's got to be a setting or something somewhere in Radiant, because all my textures and setting are correct as far as I can tell.
I'd upload my map for you but the site refuses anything but image files apparently.
Hmm, even though Q3DM7sample.map leaked, it still compiled and ran. And in that map the portal camera was working. Now to delve in to that map file more I guess.
I got it. What a hassle. It reminds me of learning how to configure Sys V.Init.