The rmtl file format can be dragged and dropped into an open Rhino viewport or imported into the Material panel. In both cases, you'll find the material in the Materials panel after that.
I sent you an email just now with the way I would do this blend combo using one advanced blend inside another and two mapping channels. One being channel 1 as surface and the other channel 2 and planar for the tire marks. The asphalt and…"
"The default in v5 is "C:\Users\(YOUR USER NAME)\AppData\Roaming\McNeel\Rhinoceros\5.0\Localization\en-US\Render Content" . The material and environment editors should also remember where you last loaded a file from though. You can also…"
This is one of the toughest types of lighting to get right. I would use a point light with disc area shadows and a brightness material blended with a basic transparent material for the shade. Use GI and adjust the power of the point…"
There are two approaches now that are worth exploring. The Noise texture in the bump channel of a BAM and the Skin type of the BAM shader. The latter can be slow due to sub surface scattering but you can tweek the depth to be less in order…"
The last examples on that link use particles for hair or fur simulation as the means to model the blades of grass. These features are standard in 3DS Max I believe. Rhino doesn't have particles, hair or fur so you are limited to using…"
Both the QMC sample rate for indirect illumination in the Luma Server and the Anti-Aliasing settings will contribute to skylight shadow quality. The render cache can additionally change things on top of these. It's all very…"
"The Brightness material will use the GI settings in the Luma Server. I would adjust the energy tweeks multiplier and possibly the gamma to say 2.2. The latter can washout the image so be careful with that one. "