Line of Effect exists as long as the target isn't completely behind a solid physical barrier. Behind as viewed from where? The center of your space? Perhaps from anywhere in your space, including edges and corners?
Worst case scenario would be from any corner of your space.
But I think as long as you have a clear line from any 1 corner you probably have line of effect.
I would probably look back to PF1 rules and examples of line of effect because I can't imagine intent changed there.
Cover uses 'center to center' measurement.
For whatever that is worth.
The periscope was what got me thinking about this.
Reading description of the periscope makes it sound more likely that you measure from the center instead of a corner.
PF1 rules (if I understood them correctly) you could be around a 90° corner from someone (imagine one edge of one of your square is on the same line as your target but there is a corner between you) and that would grant you cover, but you would still have line of effect to them.
So from the center of your space to any point in the target's space then? Unless you use an action to lean as described in the Cover rules, of course.
So from the center of your space to any point in the target's space then? Unless you use an action to lean as described in the Cover rules, of course.
I think so
line of sight uses corner to corner. line of effect uses center to center. you can see these in action during one of Jason Bulmahn's recent (I say recent, but apparently it was 8 months ago lol) play examples on his YouTubeses
That doesn't make sense. Light of Sight is just Like of Effect with a precise sense being used
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Center to center is how you determine cover, but the language "entirely behind a solid physical barrier" is much stronger than the merely "Behind an obstacle" cover uses.
Center to center for LoE also doesn't make sense because that would mean anything that gives you cover breaks line of effect, which is clearly wrong because you're intended to be able to hit things behind cover.
Yeah, center to center is too much, but perhaps center to anywhere-in-the-target-space isn't too restrictive. VTTs like Roll20 and Foundry already seem to handle it this way anyway with the line of sight functionality.
Ooh, I just realized that measuring line of effect from center also has another weird effect. If you can't see around an adjacent corner without leaning, then you're flat-footed/off-guard to any creature well beyond the corner, but you presumably also have standard or greater cover to offset this.
Wait, no! Checking for line of effect from the center doesn't work at all! Look here at the Cover picture in the Cover rules. Kyra and the ogre are described as barely being able to see each other and likely having greater cover against each other. If you measure line of effect only from the center of the ogre's space, it can't reach anywhere in Kyra's space. The only way for the ogre in the picture to have line of effect (let alone line of sight) to Kyra is to be able to measure from anywhere in his space to anywhere in Kyra's space. Then for cover, he checks the line from his center to Kyra's center.