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Cavegen/Mgv5/Mgv7: Add optional giant caverns

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Add to MapgenBasic for use by multiple mapgens.
Add to mgv5 and mgv7, enabled by default.

Similar to mgvalleys caverns but half the scale.
Parameters for upper y limit, distance caverns taper to full size, and
noise threshold (full cavern size).
As with mgvalleys caverns are generated first and classic caves are
disabled in any mapchunk containing a cavern, to avoid excessive
spreading volumes of liquids.
This also avoids floating blobs of liquid where a large classic cave
has overgenerated out into a neighbouring previously-generated mapchunk.
This commit is contained in:
paramat 2017-03-12 13:26:09 +00:00
parent 86b1542181
commit 859141a0ce
10 changed files with 303 additions and 54 deletions
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12
src/mapgen.cpp
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@ -840,6 +840,18 @@ void MapgenBasic::generateCaves(s16 max_stone_y, s16 large_cave_depth)
}
bool MapgenBasic::generateCaverns(s16 max_stone_y)
{
if (node_min.Y > max_stone_y || node_min.Y > cavern_limit)
return false;
CavernsNoise caverns_noise(ndef, csize, &np_cavern,
seed, cavern_limit, cavern_taper, cavern_threshold);
return caverns_noise.generateCaverns(vm, node_min, node_max);
}
void MapgenBasic::generateDungeons(s16 max_stone_y, MgStoneType stone_type)
{
if (max_stone_y < node_min.Y)