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Biome API decorations: 'spawnby' searches a 3D neighbourhood

The neighbours checked are the 8 nodes horizontally surrounding the decoration base
and the 8 nodes horizontally surrounding the ground node below the decoration
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paramat committed Jul 8, 2015
1 parent 39439cb commit b51738177e2dae60153a825e200ea9cdeb1cec99
Showing with 14 additions and 3 deletions.
  1. +3 −1 doc/lua_api.txt
  2. +11 −2 src/mg_decoration.cpp
@@ -3331,7 +3331,9 @@ Definition tables
-- ^ Number of nodes the decoration can be at maximum.
-- ^ If absent, the parameter 'height' is used as a constant.
spawn_by = "default:water",
-- ^ Node that the decoration only spawns next to, in a 1-node square radius.
-- ^ Node that the decoration only spawns next to.
-- ^ The neighbours checked are the 8 nodes horizontally surrounding the lowest node of the
-- ^ decoration, and the 8 nodes horizontally surrounding the ground node below the decoration.
num_spawn_by = 1,
-- ^ Number of spawn_by nodes that must be surrounding the decoration position to occur.
-- ^ If absent or -1, decorations occur next to any nodes.
@@ -246,15 +246,24 @@ bool DecoSimple::canPlaceDecoration(MMVManip *vm, v3s16 p)
return true;

int nneighs = 0;
v3s16 dirs[8] = {
v3s16 dirs[16] = {
v3s16( 0, 0, 1),
v3s16( 0, 0, -1),
v3s16( 1, 0, 0),
v3s16(-1, 0, 0),
v3s16( 1, 0, 1),
v3s16(-1, 0, 1),
v3s16(-1, 0, -1),
v3s16( 1, 0, -1)
v3s16( 1, 0, -1),

v3s16( 0, 1, 1),
v3s16( 0, 1, -1),
v3s16( 1, 1, 0),
v3s16(-1, 1, 0),
v3s16( 1, 1, 1),
v3s16(-1, 1, 1),
v3s16(-1, 1, -1),
v3s16( 1, 1, -1)
};

// Check a Moore neighborhood if there are enough spawnby nodes

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