How to get new materials

Hello forum !

I stumbled on a material that I want, please check:

And I found where the files are:

https://code.google.com/p/jmonkeyengine/source/browse/branches/jme3/src/core-data/?r=6462#core-data%2FCommon%2FMatDefs%2FLight%3Fstate%3Dclosed

I tried overwritting the 3 lighting files in the core file but I get the error: UseReflection is undefined

Where can I download latest materials package please?

I probably don’t understand your problem.
Why would you modify your core ?
Can’t you just put that in your own assets/packages ?