VFB LUT tutorial/troubleshooting guide

[ricoholmes]

Hello there,
Could I request a guide (and preferably troubleshooting / known issues) for working with LUT files from the VFB ?

There must be a simple procedure that we're missing, but we're having problems exporting LUT files to apply in Photoshop/AE.
The burn controls etc in VFB are exceptional, and we'd like to be able to export a LUT that applies the values in the VFB, but we just can't work out how that's done?


[VFB] do color corrections until we're happy.
[Globals Button] Save (as *.cube)
[Adobe Product] Color Lookup, load
[Observe results] Scratch heads and look confused


We must be doing something wrong at our end, because even when loading a saved LUT back into the VFB itself, it gives a different result to when we exported it.

You folks are fabulous at documenting.. so could you add this to the list please?

[Zdravko.Keremidchiev]

What if you disable "Convert To Log Space Before Applying LUT" option in the VFB, do you get an identical result then?

[ricoholmes]

Hello Zdravko, and thank you for the feedback.
Interestingly, I tried it with a "current" (Vray Next) scene that was build from scratch in Next, and it works as expected (though turning on "convert to log space before applying LUT" was a glaringly obvious difference, the older scenes were subtle).

I'm going to have to try it on a couple of older scenes (3.6) and see what the deal was there.

[Zdravko.Keremidchiev]

Alright, let us know how it goes. Meanwhile, it will be helpful if you could provide a scene and LUT file so we could investigate further.