picked to type

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octothorpe

Sounds simple: create an index of triangle numbers to wall object pointers.

Dim tri_to_wall.wall(MAX_TRIS)

; add triangles for wall object
tri_index = AddTriangle(...)
tri_to_wall(tri_index) = the_wall

; find picked wall
local the_wall.wall = tri_to_wall(PickedTriangle(...))

Make sense?

If it isn't feasible to use an array to index (because you are going to continually add triangles) use a hash table instead. They're super fast for lookups!