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The spell areas image is the only place to start for cones, but when it comes to converting cones in to 3-D space restricted on a one inch grid, interpretations may vary.
Here's the two house-ruled approaches I know of:
1. The first and easiest technique is to turn the template on its edge, to tell who is also caught above and below in the same cone. We'll call this technique the Cross-Configuration
2. The other technique requires assuming that the cone not only reaches out fifteen feet, but it also is 15 ft in diameter at its maximum range. This infers which additional squares are also included. We'll call this technique the 3-Space inference.
I've attempted to represent both in this image, (with each approach building on the previous).
Unfortunately, both interpretations currently appear to be beyond the scope of the RAW.
To better see how this impacts play will requires a thought experiment:
Imagine, if you will, four subjects in combat:
- Large Lion
- Medium-sized medium flying higher than the head of his large lion lackey.
- Small shaman standing on some stairs
- Tiny triggered Grim Lantern dancing behind the shoulders of its shaman
Clearly, the shaman will be safe while the lion will be lit up, even if it's only partially protruding into the path (and therefore, I left the lion out of the picture.)
But what of the medium? Do the "corners" of the cubist's cone cause him too to combust?
I'd also like to get a consensus of which technique is preferred and why, so be sure to add your vote to the tally:
X-Config: 0, 3-Space: 1