Well, something odd happend. I went and tested using hardware trilinear interpolation. And it looked better, as expected. But there was some other, unexpected thing. I ran equal OR FASTER!
I’m gonna leave a screen of only reflections. Reflection trace takes about 0.6 ms on my GTX 750 Ti at 1080p (it does render at half res). Here’s a pic, overly exaggerated to show the hw interpolation sweet stuff:
http://i.imgur.com/4Vc1lJF.png
There are still work to do, but, well, guess that screen at that time speaks for itself right ;D
GI tracing is a bit slower now, but looks better. There are some artifacts I need to solve, that’s why it’s not yet on GIT.
EDIT: The fact the chairs aren’t reflect on the ground and the light on the front that shouldn’t be there are some of the artifacts I talked about. Early stuff, but wanted to share.