/usr/lib/pd/extra/Gem/depth-help.pd is in gem 1:0.93.3-5ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #N canvas 52 90 600 500 10;
#X obj 124 219 depth;
#X msg 173 156 1;
#X msg 173 184 0;
#X text 92 291 depth turns on and off depth test (also known as Z-buffering).
This is very useful if you are in single-buffer mode \, because then
a painting effect can be achieved. In double-buffered mode \, you probably
do not want to turn off the depth test \, unless you have taken control
of the rendering order by setting the priority of each gemhead (see
the gemhead example for explanation).;
#X text 138 6 depth;
#X msg 124 249 gemList;
#X msg 124 123 gemList;
#X text 124 61 GEM object;
#X text 93 403 By default \, this object will turn OFF depth buffering
for the objects "below".;
#X text 94 438 You can set the initial state via an argument;
#X connect 0 0 5 0;
#X connect 1 0 0 0;
#X connect 2 0 0 0;
#X connect 6 0 0 0;
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