Check whether the unit is in visual range?

[zys924]

We all know LUA doesn't provide any functions that can check whether a unit is in visual range. The only way to achieve this AFAIK is to try to cast a spell and grab the check result from the combat log.
Is this sort of check clientside or serverside? if it's clientside, which C function does such stuffs?
Grateful for any help...

[Xarg0]

Traceline, take a look at the info dump thread
edit: inb4 srs flaming

[DrakeFish]

We all know LUA doesn't provide any functions that can check whether a unit is in visual range. The only way to achieve this AFAIK is to try to cast a spell and grab the check result from the combat log.
Is this sort of check clientside or serverside? if it's clientside, which C function does such stuffs?
Grateful for any help...

I won't tell you what is the offset, because I don't have it myself.
Traceline is a solution, but I don't think it's the easiest one. You may want to look at the unit structure (no I'm not talking about the structure you can find in the sticky post), you will probly find something that says if unit is in line of sight or not. If I'm not wrong, both client and server calculate line of sight.

[zys924]

Iv tried the TraceLine, and received some wierd results, here is some debug info:

[13:53:46]0x68000000128AF63, Start:-8766.732, 416.3979, 105.4191; End:-8753.438, 400.2535, 102.5564; ResultPos: -8755.156, 402.341, 102.9265; Result: 1
[13:53:46]0x68000000128AF63, Start:-8766.732, 416.3979, 105.4191; End:-8753.438, 400.2535, 102.5564; ResultPos: 0, 0, 0; Result: 0

As you can see, the same startPos and endPos can produce different result.

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate byte TraceLineDelegate(ref WoWPosition pEnd, ref WoWPosition pStart, ref WoWPosition pResult, ref float pDistance, uint dwFlag, uint pOptional);

pDistance = &1.0f
dwFlag = 0x00100171

Can anybody show me some way out. thx

---------- Post added at 02:21 AM ---------- Previous post was at 01:04 AM ----------

Resolved. Iv forgotten to reset *pDistance to 1

[MaiN]

It's done server side. There is nothing in the unit structure that represents in/out of LOS.

[DrakeFish]

It's done server side. There is nothing in the unit structure that represents in/out of LOS.

Ah I always thought there were both a server-side and client-side check (like GCD and such things).

[streppel]

i remember on emu servers when there was no collision mesh yet, you could cast everything throught everything,no matter of LOS,so it has to be serverside ^^

[unbekannt1]

struct WowPos
{
	float x;
	float y;
	float z;
};

//Traceline
typedef byte (__cdecl * tTraceline)(WowPos* End, WowPos* Start, WowPos* Result, float* Distance, UINT dwFlag, UINT Optional);
tTraceline Traceline = reinterpret_cast<tTraceline>(0x007A3B70);

bool isInLineOfSight(WowPos* End, WowPos* Start, WowPos* HitPos)
{
	float distance = 1.0f;
	return !Traceline(End,Start,HitPos,&distance,0x100011,0x0);
}

isInLineOfSight will return true if nothing is in the way and otherwise it will return false

[Robske]

http://www.mmowned.com/forums/world-of-warcraft/bots-programs/memory-editing/257771-wow-constant-data-enums-structs-etc.html#post1687087