[Jinto]

I want to use UTIL_DecalTrace in my module but can't seem to figure out how to get it working.. I might have to just rewrite the function as a helper function in the module?

Its a pretty simple function.. Just wondering if there is a way I can use it without rewriting it.

void UTIL_DecalTrace( TraceResult *pTrace, int decalNumber );

[Twilight Suzuka]

Why wont it work?

[Freecode]

whats this do?

[mahnsawce]

That's just a declaration of the function. You would need to include the actual function in your module source somewhere. It's in multiplayer/dlls/util.cpp in the HLSDK source. But note that the default UTIL_DecalTrace uses CBaseEntities, unless you use those in your module you may want to consider converting it to use edicts instead.

[Jinto]

Yes I know its just the declaration.. And I do have it included..
It crashes I presume cause I can't find the proper decal ID's

I Stuck the decal list in but it just crashes no matter what decal I use.

[mahnsawce]

This could be a couple reasons...

My initial guesses are:

1. CBaseEntities are used in the standard decaltrace. CBaseEntities are generally bad when you're dealing with a metamod (or module).

2. You're passing an invalid decal index.

I use decals in a module I'm working on, but I modified the function a bit.

Here's what I use:

void UTIL_DecalTrace( TraceResult *pTrace, const char *decalName )
{
	short entityIndex;
	int index;
	int message;
	index = DECAL_INDEX(decalName);
	if ( index < 0 )
		return;

	if (pTrace->flFraction == 1.0)
		return;

	// Only decal BSP models
	if ( pTrace->pHit )
	{
		if (!(pTrace->pHit->v.solid == SOLID_BSP || pTrace->pHit->v.movetype == MOVETYPE_PUSHSTEP))
			return;
		entityIndex = ENTINDEX( pTrace->pHit );
	}
	else 
		entityIndex = 0;

	message = TE_DECAL;
	if ( entityIndex != 0 )
	{
		if ( index > 255 )
		{
			message = TE_DECALHIGH;
			index -= 256;
		}
	}
	else
	{
		message = TE_WORLDDECAL;
		if ( index > 255 )
		{
			message = TE_WORLDDECALHIGH;
			index -= 256;
		}
	}
	
	MESSAGE_BEGIN( MSG_BROADCAST, SVC_TEMPENTITY );
		WRITE_BYTE( message );
		WRITE_COORD( pTrace->vecEndPos.x );
		WRITE_COORD( pTrace->vecEndPos.y );
		WRITE_COORD( pTrace->vecEndPos.z );
		WRITE_BYTE( index );
		if ( entityIndex )
			WRITE_SHORT( entityIndex );
	MESSAGE_END();
}

You need to declare this version too (unless you modify it to use decal indexes rather than names), then just call something like `UTIL_DecalTrace(&tr,"{blood1")`.

[Jinto]

YAY it works... Now I can finish... Thanks..

[Da Bishop]

mahnsawce is just too smart for us