apq

Noted! I'll be adding more engines to the list in a future update.

Roughness is only included in the API as a default value if, say, a plugin, would access the data and create a material in an application. Then it would get an approximate roughness value, so glass is glossy, and concrete is rough.

There's however too much variability in roughness values since it's a property of an item rather than a property of the material itself, so a drinking glass could be very rough if worn, or very glossy if new. That's why I haven't added it as a property on the website.

Hope that makes sense!

Like subb said, "sRGB Linear" means sRGB primaries without the sRGB EOTF (gamma curve) applied, which you could say is "raw linear" values, the most common way to input colors in 3d applications.

Could you explain your workflow using BRDF, and what application you're using? I just want to know the real world use case for this kind of data. I'm open to expanding the database to include BRDF data as well.