My Octane doesn't render materials properly. help!

[Park_hanee]

I'm new to Octane render and it's my first time trying to render something.

I've made mixed materials exactly the same as the tutorial (wet asphalt) and haven't touched something else.
well... I could preview the material properly at the node editor, but the live viewer shows it quite differently.
first, It just showed me some glossy road. (not applying normal map, texture image and other settings)
I thought my modeling went wrong- so I made some primitive plane and tried to drag & drop directly in the live viewer.
Now it's showing me some gray-patterend thing and I cannot find the way to apply my material properly.
plus, I've also tried to give some material (texture) to the buildings and something was wrong here too.
It was same texture but it seems to be applied differently by the buildings. some went great!
but several didn't showed up as my road. Live viewer renders great without materials, but things get complicated
when I try to give it textures and materials. I'll post my screenshot together!

[bepeg4d]

Hi,
it seems that your road is coincident with the ground plane, try to move it slightly away few mm, about buildings difficult to say, check if there are polygon selections to apply to material tags.
ciao Beppe