Parameters of Physics2D.BoxCast are unclear in the documentation

Questions & Answers
1

Looking at the documentation for BoxCast, it seems there are multiple ways to interpret the first two parameters origin and size. Notably, we could have

     +------ size.x -------+
[origin] ------------------+  +
     |                     |  |
     |                     |  size.y     (1)
     |                     |  |
     +---------------------+  +

     +------ size.x -------+
     +---------------------+  +
     |                     |  |
     |                     |  size.y     (2)
     |                     |  |
[origin]-------------------+  +

                +- size.x -+
     +---------------------+  +
     |                     |  |size.y
     |       [origin]      |  +          (3)
     |                     |
     +---------------------+

So which one is it? For what it’s worth, having the pivot of a 2D sprite character at its feet (so at the center bottom) seems to not align with the parameters of this function.

EDIT: it turns out this is the correct picture:

     +------- size.x ------+
     +---------------------+  +
     |                     |  |
     |       [origin]      | size.y      (4)
     |                     |  |
     +---------------------+  +
2

The origin of all shapes is the center point. Just like the BoxCollider2D defines the Box, you have a box of the specified size centered on the Origin.