Muzzle Flash Lighting

This tutorial will show you how to create a muzzleflash that dynamically appears and lights up the world around the player, like in Counter-Strike: Source. These types of lights are called "dlights".

This code was designed for any Orange Box based mod, singleplayer or multiplayer. It also works with NPCs, assuming they work properly.

Warning: Some dynamic props will not be lit when using dlights.

Warning: Too many dlights may result in severe performance losses on low-end systems. When coding for lighting, dlights should be used sparingly.

Note: From Slam12f, even better to can write a console command to enable or disable dlights. It is easy to implement with help. Use static ConVar.

Note: The quality of dynamic lights depends on the lightmap scale.

Implementing Dlight-based Muzzleflashes

The coding begins! Only a few minor changes are needed here to make muzzleflashes look better than ever.

First off, open up c_baseanimating.cpp and search for the function void C_BaseAnimating::ProcessMuzzleFlashEvent()

Vector vAttachment;
QAngle dummyAngles;
GetAttachment( attachment, vAttachment, dummyAngles );

// Make an elight
dlight_t *el = effects->CL_AllocElight( LIGHT_INDEX_MUZZLEFLASH + index );
el->origin = vAttachment;
el->radius = random->RandomInt( 32, 64 ); 
el->decay = el->radius / 0.05f;
el->die = gpGlobals->curtime + 0.05f;
el->color.r = 255;
el->color.g = 192;
el->color.b = 64;
el->color.exponent = 5;

Valve went a little crazy here and the result was a seemingly ugly muzzleflash. This tutorial is all about making things pretty, so lets change that. Replace the entries above with this:

			Vector vAttachment, vAng;
			QAngle angles;
#ifdef HL2_EPISODIC
                        GetAttachment( 1, vAttachment, angles ); // set 1 instead "attachment"
#else
                        GetAttachment( attachment, vAttachment, angles );
#endif
			AngleVectors( angles, &vAng );
			vAttachment += vAng * 2;
		
			dlight_t *dl = effects->CL_AllocDlight ( index );
			dl->origin = vAttachment;
			dl->color.r = 231;
			dl->color.g = 219;
			dl->color.b = 14;
			dl->die = gpGlobals->curtime + 0.05f;
			dl->radius = random->RandomFloat( 245.0f, 256.0f );
			dl->decay = 512.0f;

Note: In Source 2013, the episodic code version is the only one that will work.

Edit: Changed the code for the colors, by default it was set to a magenta-ish color. A good muzzle flash color is closer to white, you can try 252, 238, 128 for a realistic washed out yellow.

Notes

Further work is being made on this idea, the updates will add more visual effects to this idea to create a more realistic and cleaner look to the muzzle flash. The update will only work on the orange box engine A link will be provided HERE when the new muzzle flash is done

A NOTE FROM GAMERMAN12: I had updated this code so that the lights decay after firing, so you have a flashing effect when shooting machine guns. And it fades so that it's a litle more realistic. Thanks.