Inconsistencies? Diffuse, glossy, specularity, roughness

[colorlabs]

Hi,

Up until I did this experiment, I assumed that the following materials would behave in the exact same way:
1. Diffuse
2. Glossy with 0% specularity, 0% roughness
3. Glossy with 0% specularity, 100% roughness
4. Glossy with 100% specularity, 100% roughness

However, as you can see, they look pretty different. Is this a bug? Or is there something I don't understand about the nuances of glossy vs diffuse surfaces?

I just always thought I could replicate a diffuse material using the glossy sliders. But now I see that's not true.

[colorlabs]

I made a video!

[colorlabs]

Any comment from Refractive? Is this a bug? Any insight into why these look so different?

[abstrax]

Any comment from Refractive? Is this a bug? Any insight into why these look so different?

That's how the reflection model is at the moment. You could consider this as a bug in the model. We will fix it in a future version.

Cheers,
Marcus