NightVision Tutorial

Adding Nightvision To your Source Single Player Mod

Here's something that is part of Nightfall nightfall, and many people have been stumpled on - Night Vision.

Summary

Before i start, this is only one, and a very early attempt (It works), of one way to get the Night Vision Mode to work with your mod.

Before i start, i would like to credit Gnolfo from www.hl2coding.com and user:ts2do

Seting up the convar, The Meat and The Spuds

Open the file src/cl_dll/view_scene.cpp, and jump to the end (ctrl+end)

//nightfall - amckern - amckern@yahoo.com
//NightVision
static void ScreenOver_f( void )
//rename ScreenOver to what ever you wish, maybe cl_nightvis
{
	IMaterial *pMaterial = materials->FindMaterial( "HUDoverlays/nightvision", TEXTURE_GROUP_OTHER, true );
//This is the texture we are going to use for the 'effect' - never use an ext on material files

	{
		static bool bDisplayed = false;
		
		if( bDisplayed )
		{
			// turn it off
			view->SetScreenOverlayMaterial( NULL );
			engine->ClientCmd( "mat_fullbright 0\n" );//turn full bright off again
			CLocalPlayerFilter filter;
			C_BaseEntity::EmitSound( filter, 0, "Nightfall.NightVisOff" );
			//play the off sound
		}
		else
		{
			// turn it on
			view->SetScreenOverlayMaterial( pMaterial );
			//this is the HUDoverlays/nightvision texture we made a pointer to above
			engine->ClientCmd( "mat_fullbright 1\n" );//light up the world
			CLocalPlayerFilter filter;
			C_BaseEntity::EmitSound( filter, 0, "Nightfall.NightVisOn" );
			//On we go - play a sound to let the player know that the NV is on
		}
		
		bDisplayed = !bDisplayed;
	}
}

static ConCommand r_screenover( "r_screenover", ScreenOver_f );

So what we have done here is set a bool cvar (on/off) that either enables, or disables the night vision effect. if you read the comments, you will under stand what each part is doing.

Nightfall.NightVisOn

is