Here is a quick test scene (the modernized version of a scene I did in 2010):
fiber.zip (3.1 MB)
It includes the source scene as a 3ds Max 2017 file and a ready-to-render appleseed scene manually setup to use SPPM.
Here is a test render:
There is currently a small issue in appleseed: it will emit warning messages when reaching the maximum number of bounces. We’ll need to allow disabling these warnings since they cost a lot of performance. For the time being, you can set log severity to
<parameter name="message_verbosity" value="error" />