For user documentation see - http://origen-sdk.org/origen/guides/simulation/introduction

Here is some OrigenSim developer information...

How To Build a Simulation Object From a Pre-release Version of OrigenSim

• Clone and checkout the desired version of OrigenSim to a workspace
• From the workspace run: origen sim:build /path/to/your/top.v
• The testbench and artifacts will be in the output directory, make them available to your design compile step as required

How To Create a Simulation Object For Development of OrigenSim

From an OrigenSim workspace:

Select the environment you wish to use, e.g.:

origen e environment/cadence.rb

Run the following command to build a simulation object from this example device:

origen sim:build_example

Run a simulation to check that it is working:

origen g test

Repeat the above steps to recompile after making any changes to the VPI extension.