This is the Arnold 4 user guide.
Click here to go to the Arnold 5 user guide.
for Arnold 4
This manual introduces HtoA, a plug-in for Houdini which allows you to use the Arnold renderer directly in Houdini. Before beginning, you should read the sections on installation and licensing. There is also a short introductory tutorial taking new users through the steps necessary to get their first Arnold render using HtoA. Also, don't forget to look at the Tutorials section.