Thanks, it's HDRI. (directligting) Concrete is a mix-material.

I think the trees should be more contrasting. Probably my monitor was not properly calibrated.

Thanks, on horizont are HDR. Other trees are 3d.

Hello, it's part of my diploma

I'm not talking about it. I'm talking about the ability to change the atmospheric properties. (humidity, ozone, etc.) They form the shades of shadows, reflections, attenuation of the intensity of color as the distance from the object, the difference of brightness at the zenith and the horizon. This ...

I think that the physical sky — one of the most important of benefits of physical render. Really want to see him in the new version.