RTFM
Based on the manual code in TIS-3D.
This mod requires Java 8!
License / Use in Modpacks
This mod is licensed under the MIT license. All assets are public domain, unless otherwise stated; all are free to be distributed as long as the license / source credits are kept. This means you can use this mod in any mod pack as you please. I'd be happy to hear about you using it, though, just out of curiosity.
Extending
In general, please refer to the API, everything you need to know should be explained in the Javadoc of the API classes and interfaces.