Targeting burst spells, how to do it?

[Deliverance]

How does a burst spell work in regards to targeting? Does it target a square, thus making a 10 foot radius spell 25 feet across (The 20 feet of total radius plus the targeted square) or do they target square intersections, thus making a 10 foot burst simply a 10 foot square (more or less)

[Jeraa]

Quote:

Regardless of the shape of the area, you select the point where the spell originates, but otherwise you don't control which creatures or objects the spell affects. The point of origin of a spell is always a grid intersection. When determining whether a given creature is within the area of a spell, count out the distance from the point of origin in squares just as you do when moving a character or when determining the range for a ranged attack. The only difference is that instead of counting from the center of one square to the center of the next, you count from intersection to intersection.

[Kayerloth]

Given the above quote by Jeraa that means your 10ft burst is a 20ft diameter or most closely resembles a 20ft square missing the 5ft square corners. See the section on CRB>Magic>Casting Spell (scroll down to )>Aiming A Spell.

Link

[Theconiel]

HERE is another good source. It has area of effect diagrams for bursts, cones and lines. I made a set of them (except lines) on 1" x 1" graph paper and laminated the lot.