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Arnold for Softimage (or SItoA) provides a bridge to the Arnold renderer from within the standard Softimage interface. SItoA is now available to the community under an Apache2.0 open source license at:

This repository contains the official SItoA plugin source code. Solid Angle developed the SItoA plugin commercially from 2009 to 2017.

After the Softimage end-of-life announcement in April 2014, Solid Angle committed to continue the development and maintenance of SItoA for at least a year, and then extended this period until July 2017, porting SItoA to the new Arnold 5 API along the way.


Please submit your issues and pull requests on github, the old Trac server will remain available for a while as read-only but we won’t accept any new users. We will continue to monitor and review pull requests submitted to this repo on a voluntary basis, but will not release official builds any more.


  • Seamless integration with Softimage shapes, lights (selective lights) passes and render region.
  • Full ICE support (particles, strand and geometry) with advanced instancing functionality.
  • Native Softimage render tree and shader support.
  • Stand-ins with realtime view representation.
  • Productivity boost: passes, overrides, UDIM style textures.
  • Full Alembic integration via Exocortex Crate.
  • Texturable geometric lights.
  • Deep EXR.

Free Trial

Curious about Arnold? This trial will take you through step by step so you can get Arnold up and running in Softimage. Click here to start your free trial now.


The Arnold for Softimage plug-in is provided free of charge to customers that buy the Arnold core renderer. Click here for more information on pricing.


Whether you are new to Arnold or not, the Arnold for Softimage documentation should answer most of your questions. It is split into three sections: User Guide, Tutorials and Videos, and is available as html or pdf.


Arnold for Softimage is available for Windows and Linux with builds for various versions of Softimage. Go to the downloads page.


You should be able to find the answer to most questions on support.solidangle.com in the documentation or support blog. Customers with a current maintenance and support contract can also email support@solidangle.com.

Requirements & Platforms

  • Compatible with 64-bit Softimage 2013, 2014 and 2015
  • Windows 7 and later
  • Linux RHEL6 equivalent (glibc 2.12) and later
  • CPU with at least SSE 4.1 instructions (2006 and later Intel CPUs, and 2011 and later AMD CPUs)