First check you have the following Arnold core : >= 7.3.3.1
(tested on maya 2024, 2025 and 2026).
With Maya we have to edit Maya.env.
MTOA_TEMPLATES_PATH = your_path_to\rtoa\DCCs\Maya\ae
MAYA_CUSTOM_TEMPLATE_PATH = your_path_to\rtoa\DCCs\Maya\aexml
ARNOLD_PLUGIN_PATH = your_path_to\rtoa\bin
Just let the above Maya vars point to the correct location where you have rtoa.
Then you need to add an RTOA_ROOT to your OS environment variables and let it point to the the rtoa folder.
Done the install, let's check if rombo library has been correctly loaded.
Just lookup the maya console at startup and see if there're rombo entries or from Windows->Output Window (you may have to enable Verbosity to Info in Arnold Settings).
On Linux (>glibc 2.23), if you have problems loading the rtoa lib just type this in a bash terminal : 'apt-get install build-essential'. We rely on GCC for rtoa compilation on Linux and with the above you just install main libs to support that.
You'll then find rombo nodes for example in the Hypershade, Arnold->Shaders group.
To let Maya load correctly the maps from rombo scenes, goto File->SetProject and point the path to the maya scenes rombo project. Take care that to have a lighter package we removed the .tx files so at a first run generating them will take some little extra time.
Eventually if some scenes look too dark and saturated compared to what you see here please set the view transform to un-tone-mapped sRGB. ACES is fully supported by default but we don't particularly like it so we may have not used it on some scenes. As a general rule of thumb .. if you see a rombo tonemapper in the imagers list set the view transform to sRGB.
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