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