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-rw-r--r--data/mods/default/init.lua12
1 files changed, 12 insertions, 0 deletions
diff --git a/data/mods/default/init.lua b/data/mods/default/init.lua
index c37f0e815..09648699d 100644
--- a/data/mods/default/init.lua
+++ b/data/mods/default/init.lua
@@ -429,6 +429,18 @@
-- chance = 1, -- (chance of trigger is 1.0/this)
-- action = func(pos, node, active_object_count, active_object_count_wider),
-- }
+--
+-- Item groups:
+-- - Groups always have a rating associated with them. If there is no
+-- useful meaning for a rating for a given group, it shall be 1.
+-- - When not defined, the rating of a group defaults to 0.
+--
+-- Special groups:
+-- - dig_immediate:
+-- - 2: node is removed without tool wear after 1 second or so
+-- - 3: node is removed without tool wear immediately (like a torch)
+-- - level: Can be used to give an additional sense of progression in the game.
+-- - 0 is something that is directly accessible at the start of gameplay
WATER_ALPHA = 160
WATER_VISC = 1