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Decoration API: Add lightweight ability to have complete coverage (#7456)

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When the noise value or fill_ratio >= 10.0 complete coverage is enabled.
This disables random placement to avoid redundant multiple placements
at one position. Instead, 1 decoration per surface node is placed by
looping across each division.

'10' was chosen as this is the fill_ratio that previously created
very near complete coverage. The complete coverage feature therefore
integrates smoothly when noise is used for variable decoration density.

'fill_ratio = 10' should be used by modders who want a decoration
placed on every surface node. Compared to before such a decoration
placement will be 10 times faster.
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Paramat 2018-06-24 17:14:18 +01:00 • committed by GitHub
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commit de621d5d4b
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2 changed files with 33 additions and 9 deletions
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doc/lua_api.txt
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@ -5769,6 +5769,8 @@ Definition tables
fill_ratio = 0.02,
-- ^ The value determines 'decorations per surface node'.
-- ^ Used only if noise_params is not specified.
-- ^ If >= 10.0 complete coverage is enabled and decoration placement uses
-- ^ a different and much faster method.
noise_params = {
offset = 0,
scale = 0.45,
@ -5783,6 +5785,8 @@ Definition tables
-- ^ distribution.
-- ^ A noise value is calculated for each square division and determines
-- ^ 'decorations per surface node' within each division.
-- ^ If the noise value >= 10.0 complete coverage is enabled and decoration
-- ^ placement uses a different and much faster method.
biomes = {"Oceanside", "Hills", "Plains"},
-- ^ List of biomes in which this decoration occurs. Occurs in all biomes
-- ^ if this is omitted, and ignored if the Mapgen being used does not