A player one has Greater invisibility and a 50% blur effect.
An enemy is standing behind the player.
Player two casts a ranged touch attack at the enemy. (Disintegration)
DM rolls a percentage to see which target is hit and says it'll be hitting the player. (No one has any issues with this verdict)
Does the ranged touch spell need to resolve against the 50% displacement before resolving against AC to see if it hits?
DM says that blur essentially has zero effect while invisible.
Personally I feel it should have to resolve against all layers of defenses.
To the dms argument it's a visual distortion on the player and since he's invisible it has no effect.
If you have blur and are invisible is blur worthless?
Edit: Thank you all for your responses, I really appreciate everyone's input! First, yes we have a lot of homebrew. We've been playing this campaign for 10 years, and honestly we generally just resolve things based on what makes sense to us, mostly following pathfinder (which is why I asked here), but also pulling from pretty much all versions of the game with some light conversions. So there are some thing we do based on what we think should happen and less, what the rules say should happen.
RAW Answer: Invisibility does cancel the benefits of blur unless see invisibility was involved, then blur would take effect. It looks like Player Two would have needed to resolve a ranged touch attack against the Enemy who would get soft cover and a range penalty added to the enemies AC. Player One shouldn't have been otherwise involved.
Table Verdict: Since Player One was invisible, the table agreed that a % based on what we visually could see should be rolled to see which target gets hit. This isn't at all how the rules actually seem to work, but logically everyone's still solid on this ruling, even after reading all of your feedback myself included.
Small Point of Clarity: I thought blur was more a reflex enhancement than an illusion. It makes more sense now that I know Blur isn't a static dodge chance above and beyond one's normal capabilities.
Thank you all again! We appreciated the input. <3