Live Histogram for VFB - not hidden in stack.

[malan9999]

This would be very useful, and it's surprising it's not yet implemented in Vray 7. Can the devs give a nod to when this being introduced - I understand Corona has it already.

[hermit.crab]

A histogram is built in the Curves layer that can be used for this purpose, however, it seems it's broken. I've logged the issue (internal tracker ID: VFB-155) for dev investigation. Corona's Histogram appears to work similarly - a Curves layer on top of everything for monitoring.

[dimitar_panayotov]

https://chaosvray.ideas.aha.io/ideas/VFB-I-25
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