To use the commands, you will need the developer console.
You can activate the console if you click on 'Options' in the ESC menu.

There you will find a 'Keyboard' tab - click on the 'Advanced...' button
and tick "Enable developer console". Click 'Apply' and 'Ok' and you are ready!

The standart key to bring up the console is ' ~ '.
You can change the key if you scroll all the way down in the Keyboard tab!

There some annoying things that prevent you from making Garry's Mod machinimas.
Such as the HUD (Health/Ammo display) or the Death notification!



You can turn it off by typing in: cl_drawhud 0
or turn it on by typing in: cl_drawhud 1

You can bind keys to the command, for example i use the keys 'K' and 'L':
bind k "cl_drawhud 0" / bind l "cl_drawhud 1"

The easiest way to hide/display these things is to bind a key to TOGGLE them on and off!
for example i use the key 'O': bind o "toggle cl_drawhud 0 1"

Now you only need 1 key to hide/display the HUD!

You can now hide the HUD in the Context Menu ('C' Key)



Everytime someone dies in the world, there is a Death notification on the upper right corner which shows the killer and the killed NPC!

You can simply hide/display the notification with the command:
hud_deathnotice_time 0 / hud_deathnotice_time 1

I don't will show you how to bind a key or toggle this notification because its the same as it is in the HUD command!



There is a command to clear all the decals in the world, very useful if you have bulletholes in your props!

The command to clear all decals: r_cleardecals