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diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
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+/*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "mg_ore.h"
+#include "mapgen.h"
+#include "util/numeric.h"
+#include "map.h"
+#include "log.h"
+
+
+FlagDesc flagdesc_ore[] = {
+ {"absheight", OREFLAG_ABSHEIGHT},
+ {"scatter_noisedensity", OREFLAG_DENSITY},
+ {"claylike_nodeisnt", OREFLAG_NODEISNT},
+ {NULL, 0}
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+Ore *createOre(OreType type)
+{
+ switch (type) {
+ case ORE_SCATTER:
+ return new OreScatter;
+ case ORE_SHEET:
+ return new OreSheet;
+ //case ORE_CLAYLIKE: //TODO: implement this!
+ // return new OreClaylike;
+ default:
+ return NULL;
+ }
+}
+
+
+Ore::~Ore()
+{
+ delete np;
+ delete noise;
+}
+
+
+void Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+ int in_range = 0;
+
+ in_range |= (nmin.Y <= height_max && nmax.Y >= height_min);
+ if (flags & OREFLAG_ABSHEIGHT)
+ in_range |= (nmin.Y >= -height_max && nmax.Y <= -height_min) << 1;
+ if (!in_range)
+ return;
+
+ int ymin, ymax;
+ if (in_range & ORE_RANGE_MIRROR) {
+ ymin = MYMAX(nmin.Y, -height_max);
+ ymax = MYMIN(nmax.Y, -height_min);
+ } else {
+ ymin = MYMAX(nmin.Y, height_min);
+ ymax = MYMIN(nmax.Y, height_max);
+ }
+ if (clust_size >= ymax - ymin + 1)
+ return;
+
+ nmin.Y = ymin;
+ nmax.Y = ymax;
+ generate(mg->vm, mg->seed, blockseed, nmin, nmax);
+}
+
+
+void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
+ u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+ PseudoRandom pr(blockseed);
+ MapNode n_ore(c_ore, 0, ore_param2);
+
+ int volume = (nmax.X - nmin.X + 1) *
+ (nmax.Y - nmin.Y + 1) *
+ (nmax.Z - nmin.Z + 1);
+ int csize = clust_size;
+ int orechance = (csize * csize * csize) / clust_num_ores;
+ int nclusters = volume / clust_scarcity;
+
+ for (int i = 0; i != nclusters; i++) {
+ int x0 = pr.range(nmin.X, nmax.X - csize + 1);
+ int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
+ int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
+
+ if (np && (NoisePerlin3D(np, x0, y0, z0, seed) < nthresh))
+ continue;
+
+ for (int z1 = 0; z1 != csize; z1++)
+ for (int y1 = 0; y1 != csize; y1++)
+ for (int x1 = 0; x1 != csize; x1++) {
+ if (pr.range(1, orechance) != 1)
+ continue;
+
+ u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
+ if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+ continue;
+
+ vm->m_data[i] = n_ore;
+ }
+ }
+}
+
+
+void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
+ u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+ PseudoRandom pr(blockseed + 4234);
+ MapNode n_ore(c_ore, 0, ore_param2);
+
+ int max_height = clust_size;
+ int y_start = pr.range(nmin.Y, nmax.Y - max_height);
+
+ if (!noise) {
+ int sx = nmax.X - nmin.X + 1;
+ int sz = nmax.Z - nmin.Z + 1;
+ noise = new Noise(np, 0, sx, sz);
+ }
+ noise->seed = seed + y_start;
+ noise->perlinMap2D(nmin.X, nmin.Z);
+
+ int index = 0;
+ for (int z = nmin.Z; z <= nmax.Z; z++)
+ for (int x = nmin.X; x <= nmax.X; x++) {
+ float noiseval = noise->result[index++];
+ if (noiseval < nthresh)
+ continue;
+
+ int height = max_height * (1. / pr.range(1, 3));
+ int y0 = y_start + np->scale * noiseval; //pr.range(1, 3) - 1;
+ int y1 = y0 + height;
+ for (int y = y0; y != y1; y++) {
+ u32 i = vm->m_area.index(x, y, z);
+ if (!vm->m_area.contains(i))
+ continue;
+ if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+ continue;
+
+ vm->m_data[i] = n_ore;
+ }
+ }
+}
+