32 lines
1.1 KiB
Lua
32 lines
1.1 KiB
Lua
--[[
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Crater MG - Crater Map Generator for Minetest
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(c) Pierre-Yves Rollo
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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--]]
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local mod = _G[minetest.get_current_modname()]
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-- Computes noise amplitude (actually half amplitude, can go form -amplitude
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-- to + amplitude)
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function mod.get_noise_amplitude(noise_params)
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if (noise_params.persist == 1) then
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return noise_params.octaves * noise_params.scale
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else
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return noise_params.scale *
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(noise_params.persist ^ noise_params.noise_params.octaves - 1)
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/ (noise_params.persist - 1)
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end
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end
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