Reflection in specular channel, is this correct?

[Buck]

While trying to debug some things, a coworker noticed this, and to me it looks incorrect, but I generally don't use the spec and reflect channels anymore (I mostly just use light selects), so I'm not entirely sure if this is normal behavior or not? It seems that the direct reflection of the dome light and rectangle light on a material with a glossiness of 1.0, would be a reflection and not a Spec, or is this not the case?

Sphere, with a default dome and rectangle light, and a v-ray material with the only change being reflection color set to white.

Happens both CPU IPR, and CPU bucket rendering. Didn't try others. Tried it on 4.12.02 as well as 4.30.01. Maya 2018.4, on OSX High Sierra 10.13.6

Here's the .ma scene:

reflect_spec_v001.ma.zip


Here's the RGB:






Here's the Reflect:





Here's the Spec:

[yolov]

The Reflection and Specular channels don't correspond to reflective surfaces with glossiness of 1.0 and below 1.0. Instead, these correspond to the indirect (Reflection) and direct (Specular) reflections. This has always been the case, but I believe the confusion comes from relating them to glossiness.
If you need to capture direct glossy (gloss 1.0), direct rough (gloss < 1.0), indirect glossy and indirect rough reflections separately, you can do this with Light Path Expressions in V-Ray 5.

But if there's something else you need to do, please let me know and we'll think of something.

[Buck]

This is how V-Ray has normally treated reflecting lights? I seem to remember it being different, but I could be wrong. I don't use the spec and reflect channels often. Thanks for the reply