To do this, simply go here[ficool2.github.io], scroll down and download "Source SDK 2013 Multiplayer" as this is what NMRiH is based off of.


After clicking the button, it should automatically download as a zip. It's only around ~7.07mb

Unzip the downloaded hammer++ zip into some folder - like your downloads or desktop.
Inside the unzipped folder, there's a readme and a "bin" folder:

You can read the readme if you want but it basically says the same thing I'll show you.

Now, inside the bin folder, there's a "hammerplusplus" folder and .exe:

You don't need to open or run either of these, just select both of these and copy them for now.

Now the ~kinda~ tricky part;
Find your nmrih game folder - you either find it in your steamapps\common folder OR:
1. Right click nmrih in your steam library
2. Click "Properties"
3. Click "Local Files" and then "Browse"
4. That's it.

After finding the folder, go into it's "bin" folder and either drag in or paste the files from before:

If it (for some reason) asks you to replace files, go ahead and say yes.

Before running hammer++ which is in the files now, run the normal hammer.exe that's in the game's bin folder, this loads and establishes all the game's custom entity models, materials, scripts, etc. for hammer++ to use.

If you don't do this, nothing bad will happen but you basically can't do anything nmrih related without doing this, you'd just be stuck with basic abilities, which is boring.

Then, just run hammer++ (make sure hammer.exe is closed) and it should work.

If you are already familiar with hammer++'s tools and abilities then you could just skip this section, but I still suggest you continue reading - in case you missed something.

Alright, say you're trying to edit a pre-existing nmrih map (we'll get to how you can do that in a bit) and you can't see a damn thing through all the dev textures and your pc's slowing down, simply click this little button to hide all dev stuff: (which includes the skybox)
It should be at the top right of your top left window

Pretty cool, right? Now let's say you want to preview the lighting without rendering the map for 6 hours, just click this:


Then click this:


Now you can see your beautiful lighting! Check it out:


You can mess with all it's settings, but I just leave it at default.

Alright, let's say you also want to get rid of those pesky little entity sprites, just click this button:


Nice, right?

First of all, in order to load up the game's map files (.bsp's), we need to convert them to editable map files, known as .vmf's, which we can load in hammer++.

"How do we do this?"
You download BSPSource, dummy.
Simply download it from here[github.com]

"But which file do I download??!/1!?"
This one, doofus:


Extract the files and run the .jar file
(You need Java for BSPSource to work)

Then, simply find the .bsp of the map you want to edit (for nmrih, it's in nmrih\nmrih\maps)
and decompile it.
If the decompile goes well and doesn't crash, then you're good to go! Just load up the .vmf in hammer++ and you're good.

NOTE: Say you're editing an existing nmrih map and it has an explosion or something at the end of the map, hammer++ will automatically display the particles over and over, which can be annoying.
Just find the info_particle_system entities in your map and either delete them (not recommended), or select all of them and press "H", this will hide them. Remember to unhide them before running the map or they won't appear/function. To unhide them, press "U" while in the editor.

Thanks for reading this dumb little guide.
I hope it helped you in using hammer++ for nmrih!
If you have any problems, suggestions, bugs, etc. please comment down below and I'll try to figure it out (or someone smarter in the comments will).

Please don't heckle me because you accidentally deleted system 32 or something, that's your fault, not mine. If your game for some reason just stops working after installing hammer++, you probably really messed something up and you should just validate your game's files.

Thanks.