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The Arnold for Katana plugin comes in two flavors: Solid Angle's KtoA, and a minimal variant of that which ships with Katana and will already be available when Katana is installed.

KtoA

KtoA comes bundled with Arnold core, and is tuned to work with the version it is bundled with.  It also has additional plugins, such as common shaders, volume plugins (OpenVDB volumes), kick, the Arnold python API, and so on.  Generally to launch Katana with KtoA you just need to expand the KtoA tarball and set the following environment variables, customized to your environment (the PATH and license variables are not required):

export foundy_LICENSE=4101@localhost
export solidangle_LICENSE=5053@localhost
export DEFAULT_RENDERER=arnold
export "KATANA_TAGLINE=With KtoA and Arnold"
export KATANA_HOME=$USER/Katana-2.5v4
export PATH=$KATANA_HOME:$PATH
export KATANA_RESOURCES=$USER/KtoA-1.1.3-linux

Each KtoA version comes pre-qualified for particular Arnold core and Katana versions and comes bundled with a particular Arnold core version. Please see the release notes for each KtoA version for compatibility.

Setting Environment Variables

After installing Katana and downloading Arnold, the following environment variables ought to be set, and an example of each is given:

  • ARNOLDTREE is the path to your Arnold installation root. This is not used by Arnold itself, but by Katana's Arnold integration; if you do not set this, you should instead symlink the path from your Arnold installation to /usr/local/arnold

  • KATANA_HOME is the path to your Katana installation root.
  • PATH should be modified to include at least the Arnold bin directory, which is in $ARNOLDTREE/bin, and additionally you can include $KATANA_HOME as well to place the katana binary in your path for convenience.
  • KATANA_RESOURCES should be set or modified to include the Arnold/Katana renderer resources; this is $KATANA_HOME/plugins/Resources/Arnold4.0.

If you are using a bash shell, you may create a script before running katana. The contents of this file would look like this (modify your paths accordingly):

export foundry_LICENSE=4101@localhost
export solidangle_LICENSE=5053@localhost
export DEFAULT_RENDERER=arnold
export "KATANA_TAGLINE=With crusty old Katana-Arnold"
export ARNOLDTREE=$USER/katana-tests/Arnold-4.2.6.0-linux
export KATANA_HOME=$USER/Katana-2.0v1
export PATH=$ARNOLDTREE/bin:$KATANA_HOME:$PATH
export KATANA_RESOURCES=$KATANA_HOME/plugins/Resources/Arnold4.2

 

Troubleshooting

When rendering in Katana, always check the Render Log Viewer (bottom right) for any errors.

libai.so
/work/apps/katana/plugins/Resources/Arnold4.2/RenderBin/arnold_render: error while loading shared libraries: libai.so: cannot open shared object file: No such file or directory

 

If the plugin cannot find libai.so then make sure the LD_LIBRARY_PATH is pointing to the location of your arnold bin (/work/apps/arnold/dist/Arnold-4.2.6.0/bin).


More Environment Variables

There are a few more environment variables of interest:

  • PYTHONPATH: you may want to extend this to include the python subdirectory of your Arnold installation ($KTOA_ROOT/python)
  • (deprecated) ARNOLD_SHADERLIB_PATH: you may extend the areas that Katana searches for your Arnold shaders with this variable
  • ARNOLD_PLUGIN_PATH: you may extend the directories that KtoA searches for your Arnold shaders, procedurals, volumes, drivers, etc plugins
  • PATH: if you wish to use kick or maketx directly from KtoA, please append to this the path to the bin subdirectory of KtoA
  • LD_LIBRARY_PATH: usually does not need to be set, but to get access to libai.so it may be necessary to append the bin subdirect of KtoA to this variable

Licensing Environment Variables 

Although not specific to Katana, you may want to set the following environment variables to remove the Arnold watermark from your rendered images:

  • foundry_LICENSE is set to your port and license server for Katana, e.g. 4101@localhost; please see The Foundry's documentation on licensing of Katana for more information
  • ADSKFLEX_LICENSE_FILE is set to your port@host for Autodesk CLM licensing of Arnold
  • solidangle_LICENSE is set to your port and license server for Arnold, e.g. 5053@localhost; or, it is set to the path of your node-lock license file
  • (deprecated) ARNOLD_LICENSE_HOST is set to your license server for Arnold, possibly localhost
  • (deprecated) ARNOLD_LICENSE_PORT is set to your license server's port, usually 5053

 

 

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