Hi guys,

I searched for this and didn’t see anything on it so apologies if this has 
already been covered.

I’m seeing 2 issues:

1. All OCIO nodes aren’t sourcing the same OCIO config — some nodes are 
correctly using the config set by the $OCIO environment variable but some are 
using the config saved to Nuke 9’s OCIOConfigPath knob (incorrect), which 
appears to be a problem if you update your $OCIO environment variable at any 
point after initially saving the nuke script.

2. Either the OCIOConfigPath knob is broken, or it’s purpose is suspect.

When first seeing Nuke 9’s OCIOConfigPath knob attached to the root node, I 
thought it was probably meant to serve as a record of the resolved OCIO config 
path used in that nuke session — which is a great idea. Unfortunately, I’m 
seeing that the OCIOConfigPath knob does not update accordingly and actually 
interferes with Nuke’s ability to source the proper OCIO config with some nodes.

e.g.: if you change your OCIO environment variable and open an existing Nuke 9 
script from a new shell, it appears that the OCIOColorspace node ignores the 
OCIO config defined by the current $OCIO environment variable in favor of the 
config previously hardcoded to the nuke.Root()['OCIOConfigPath'].value() that 
was encoded at it’s INITIAL SAVE. You’ll also notice the OCIO Viewer LUTs *do* 
reflect the current $OCIO environment variable and they *do* use the proper 
config. 
 
This also means when you start a fresh new script and then save it for the 
first time, Nuke encodes the current resolved OCIO environment variable value 
to the OCIOConfigPath knob, never to be changed. This knob appears to ignore 
any subsequent updates to the OCIO environment variable path in favor of the 
value it encoded at first save. This seems like it must be a bug?

Since the OCIOConfigPath is a READ ONLY knob, as far as I know, Nuke will not 
allow me to change it via Python. The only workaround I’ve found with existing 
scripts to ensure all of Nuke’s OCIO nodes use the current $OCIO config thus 
far is to open the .nk file in a text editor and remove the line 
"OCIOConfigPath /path/to/my/initial_config.ocio”. 

I need to make certain that all of Nuke is using the *SAME* and current OCIO 
config at all times. How do I do this without munging the .nk file? 

Hopefully it’s something obvious that I’m missing.

Thanks!
Jep


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