
Arkhios |

If a character gets sneak attack from a class or prestige class that is not a rogue, what is the intent of effective rogue level.
For example, for a character that is rogue 7/halfling opportunist 4, is his rogue level effectively 11 or 7, for purposes of being able to overcome improved uncanny dodge?

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I don't see anything in the Halfling Opportunist PrC that says its levels stack for the purpose of Uncanny Dodge.
I believe only classes that grant Uncanny Dodge increase your effective level for that purpose.
EDIT:
If a character already has uncanny dodge (see above) from another class, the levels from the classes that grant uncanny dodge stack to determine the minimum rogue level required to flank the character.

Xethik |

The relevant text is this, Nefreet:
This defense denies another rogue the ability to sneak attack the character by flanking her, unless the attacker has at least four more rogue levels than the target does.
This is about overcoming Imp Uncanny Dodge, not having it.
RAW, it only counts Rogue levels (Ninja would count, too). You could argue it works for Vivisectionist alchemists, but it's iffy.
At 1st level, a vivisectionist gains the sneak attack ability as a rogue of the same level. If a character already has sneak attack from another class, the levels from the classes that grant sneak attack stack to determine the effective rogue level for the sneak attack’s extra damage dice (so an alchemist 1/rogue 1 has a +1d6 sneak attack like a 2nd-level rogue, an alchemist 2/rogue 1 has a +2d6 sneak attack like a 3rd-level rogue, and so on).
That part seems to specify damage dice only. The first line somewhat implies that it would work for Uncanny Dodge, but it's iffy. No where in the Sneak Attack class feature does it mention counting as a Rogue for overcoming Improved Uncanny Dodge.
Something I wished they fixed from 3.5

Rub-Eta |
Sneak Attack have NOTHING to do with this. You get the ability to overcome Improved Uncanny Dodge from Improved Uncanny Dodge it self.
[...]This defense denies another rogue the ability to sneak attack the character by flanking her, unless the attacker has at least four more rogue levels than the target does. [...]
And there is nothing in Halfling Opportunist that says its' levels stack with a Rogue's from the purpose of Improved Uncanny Dodge. Your level is effectively 7 for overcoming Improved Uncanny Dodge.

Arkhios |

Jeez, don't get so heated up about it...
Quite the contrary, sneak attack has everything to do with Improved Uncanny Dodge.
What I was indeed wondering was if any other class than rogue that grants sneak attack dice were meant to stack or qualify as effective rogue levels for that purpose. Not whether they are now, but *meant to*.

Dolanar |
When 2 Rogues meet, they Compare their Uncanny Dodge (or more Specifically Improved Uncanny Dodge) IUD is the Class Ability that grants the immunity to Sneak Attack by other Rogues, Not Sneak Attack. Classes that offer Uncanny Dodge stack to determine who has priority (as stated in the Improved Uncanny Dodge entry)
just to be clear- a 15th level Rogue & a 16th level Rogue meet on opposite sides of a fight, the 16th level Rogue sneaks up behind the 15 & stabs him (no sneak attack), meanwhile the 20th level Rogue who is 4+ levels above either of the other Rogues would get his Sneak attack against both.

Arkhios |

When 2 Rogues meet, they Compare their Uncanny Dodge (or more Specifically Improved Uncanny Dodge) IUD is the Class Ability that grants the immunity to Sneak Attack by other Rogues, Not Sneak Attack. Classes that offer Uncanny Dodge stack to determine who has priority (as stated in the Improved Uncanny Dodge entry)
just to be clear- a 15th level Rogue & a 16th level Rogue meet on opposite sides of a fight, the 16th level Rogue sneaks up behind the 15 & stabs him (no sneak attack), meanwhile the 20th level Rogue who is 4+ levels above either of the other Rogues would get his Sneak attack against both.
I do understand your point; yes, it sure is improved uncanny dodge which gives you the immunity against sneak attack damage; but what really boggles me, is that you deliberately keep ignoring the fact that IUD only prevents Sneak Attack damage from flanking (nothing else!) and only if the attacker doesn't have high enough rogue levels. So, in that perspective IUD has everything to do with Sneak Attack and vice versa.

Khrysaor |
It just denies vs. flanking. It says you lose dex due to feint still in uncanny dodge. Uncanny dodge also says the rogue can't be caught flat footed, so with both in effect you need some ability that specifically says denied dex to AC like feinting.
It's not improved uncanny dodge vs improved uncanny dodge. It's level vs. level. A level 14 rogue can still flank a level 10 rogue where the rogues IUD doesn't provide the protection.
So a rogue should have a few points in wisdom along with maxed out sense motive to protect vs feinting and he's set unless an enemy is 4 levels above them.

CrazyGnomes |

RAW, Improved Uncanny Dodge only cares about rogue levels vs. stacking levels from classes that grant Uncanny Dodge (barbarian 2+, assassin 2+, shadowdancer 2+, stalwart defender 3+, rogue 4+, ninja 4+).
RAI, I would imagine that if a class stacks with (or substitutes for, like ninja) rogue levels for the purposes of sneak attack dice (vivisectionist alchemist, assassin, inner sea pirate, master spy, red mantis assassin, sleepless detective, arcane trickster 2+, halfling opportunist 2+, lion blade 2+, pain taster 2+, aspis agent 3+, bellflower tiller 3+, low templar 3+), it would also stack for the purposes of flanking an enemy that has Improved Uncanny Dodge.
(Oddly, unlike other archetypes/PrCs that give Sneak Attack, sandman bard 5+ does not say the bonuses on damage stack.)

Joe loves Rules |
I believe every class that grants SA dice specifically says that it functions exactly as the rogue ability. Thus a reasonable RAW argument could be made that all the class levels do stack, and the RAI seems clear.
As for the IUD vs IUD to determine who can sneak attack whom, it is clear RAW and RAI that even a rogue who gives up IUD through an archetype can sneak attack another rogue that has IUD, if the IUD-lacking rogue has a high enough relative level.

Dolanar |
The original Question was about overcoming IUD, my post was simply about IUD, if you are moving on to some other aspect that is different. For the purposes of Sneak Attack Damage, if Precision Damage ability says it stacks with Sneak Attack it stacks. However, when it comes to overcoming IUD only classes that offer Uncanny Dodge count (& only after they get the Uncanny Dodge ability, I would think.)
Essentially you have to divorce the idea of Sneak Attack & Uncanny Dodge from each other. Your sneak Attack effective level is meaningless when it comes to dealing with Uncanny Dodge, only your Uncanny Dodge levels matter. If your Uncanny Dodge levels are +4 over the other persons then you do your Sneak Attack Damage. As far as using your Sneak Attack in other ways...
Feint works, Invisibility does not (called out specifically in Uncanny Dodge), Flanking does not, Immobilization does, any method of forcing the Flat Footed status does not. Other options not mentioned that fall into other categories may work.

Joe loves Rules |
The original Question was about overcoming IUD, my post was simply about IUD, if you are moving on to some other aspect that is different. For the purposes of Sneak Attack Damage, if Precision Damage ability says it stacks with Sneak Attack it stacks. However, when it comes to overcoming IUD only classes that offer Uncanny Dodge count (& only after they get the Uncanny Dodge ability, I would think.)
Essentially you have to divorce the idea of Sneak Attack & Uncanny Dodge from each other. Your sneak Attack effective level is meaningless when it comes to dealing with Uncanny Dodge, only your Uncanny Dodge levels matter. If your Uncanny Dodge levels are +4 over the other persons then you do your Sneak Attack Damage. As far as using your Sneak Attack in other ways...
Feint works, Invisibility does not (called out specifically in Uncanny Dodge), Flanking does not, Immobilization does, any method of forcing the Flat Footed status does not. Other options not mentioned that fall into other categories may work.
Only the defender's IUD matters. Levels in barbarian would not help overcome IUD.

laarddrym |

just to be clear- a 15th level Rogue & a 16th level Rogue meet on opposite sides of a fight, the 16th level Rogue sneaks up behind the 15 & stabs him (no sneak attack), meanwhile the 20th level Rogue who is 4+ levels above either of the other Rogues would get his Sneak attack against both.
Actually, the 20th level Rogue would still have to flank the other two rogues in order to get Sneak Attack. The other two rogues still have Uncanny Dodge and do not lose their Dex to AC when flatfooted or when attacked by unseen/invisible assailants. The 20th level Rogue would have to flank one of the other rogues to get Sneak Attack.
Any of the rogues could get sneak attack against any of the other rogues in this scenario by successfully feinting or by rendering their target stunned, helpless, pinned, or cowering.

Joe loves Rules |
Now that misunderstandings about how uncanny dodge actually works under normal single-class situations have been cleared up, back to the original question! I think it can be succinctly paraphrased as:
Is your effective rogue level for sneak attack what determines your effective rogue level for flanking opponents with improved uncanny dodge?
Or in other words:
Is the text of IUD about sneak attack a reminder that denying flanking denies sneak attack from flanking, or is it saying that the sneak attack ability itself is what overcomes IUD?

Arkhios |

But, if two characters with IUD meet in battle and neither has rogue levels and/or sneak attack dice pool, they would end up none the wiser both. IUD vs. IUD has no effect whatsoever, it's the sneak attack, or more specifically, rogue levels, that matter against IUD, if anything.
Plus I didn't say, or at least didn't mean to say, that Sneak Attack in itself would overcome IUD, rather, the effective rogue level in conjunctiom with sneak attack, when it would even have some effect.

Dolanar |
Its any class that offers IUD, if a Rogue & a Fighter approach a Barbarian in flanking position & the Rogue is not 4+ levels above the Barbarian, the Rogue does not Flank the Barbarian (& the Fighter does not Flank the Barbarian at all)
As I am reading & understanding this- IUD makes anyone who has it Immune to Flanking period. The exception to this is if a Rogue has 4 more levels than the Barbarian has levels. However this would mean that you would need 2 Rogues to do this.
Any Levels from a class that offers Uncanny Dodge are added together to determine total level (such as an 8Rogue/5Barbarian counting as level 13 for purposes of Flanking as opposed to an 8Rogue/5Fighter only counting as lvl 8)
My question then becomes this. if 2 level 15 barbarians come across a level 10 Rogue...Do they flank him?

Dolanar |
So bottom line is this: IUD stops anyone from Flanking. The exception is anyone with Precision Based damage attacks who also have IUD, in this case, count all of your Uncanny Dodge class levels, if they total +4 over the opponent's levels then you may Flank (if you have a partner who also may flank) & use your sneak attack.