modules/flow: restore previous Z depth

While optimizing the threaded rendering in commit 6d6c141, the
pos.{xy} expanding from 0-1 to -1..+1 were eliminated from the
inner loops in favor of just having the positions always in
-1..+1 coordinates.  But I missed that it was only the x/y
coordinates which were being expanded, with .z being left in the
0-1 space, which had a desirable aesthetic effect of condensing
the Z space, flattening everything.

This commit undoes that, without reintroducing the expansion to
the inner loops.  It's a bit crufty because now .z is treated
exceptionally throughout as 0..1 while {.x,.y} are in -1..+1, but
it's fine for now.

0 files changed, 0 insertions, 0 deletions