A few days ago I was in Paris at the Jenkins User Conference where I hold a talk on how we use jenkins to power our unity3d build pipeline. This can serve as entry point to someone who wants to do CI using that platform.
You can find the slides from the talk in this PDF.
If you wish more editing options or more Unity3d material, this zip file contains the original LibreOffice slides and attachments. The original presentation contain a few hidden slides that are a bit Unity3d specific and didn't deserve to be shown to a Jenkins user audience.
As for the tools used or created to support the pipeline, here are the relevant links: