3 files changed, 23 insertions, 6 deletions
diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
index 0d0f74bf5..f5d312ba2 100644
--- a/src/mg_ore.cpp
+++ b/src/mg_ore.cpp
@@ -176,8 +176,8 @@ void OreSheet::generate(MMVManip *vm, int mapseed, u32 blockseed,
 	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);
+	u16 max_height = column_height_max;
+	int y_start = pr.range(nmin.Y + max_height, nmax.Y - max_height);
 
 	if (!noise) {
 		int sx = nmax.X - nmin.X + 1;
@@ -200,10 +200,12 @@ void OreSheet::generate(MMVManip *vm, int mapseed, u32 blockseed,
 				continue;
 		}
 
-		int height = max_height * (1. / pr.range(1, 3));
-		int y0 = y_start + np.scale * noiseval; //pr.range(1, 3) - 1;
+		u16 height = pr.range(column_height_min, column_height_max);
+		int ymidpoint = y_start + noiseval;
+		int y0 = ymidpoint - height * (1 - column_midpoint_factor);
 		int y1 = y0 + height;
-		for (int y = y0; y != y1; y++) {
+
+		for (int y = y0; y < y1; y++) {
 			u32 i = vm->m_area.index(x, y, z);
 			if (!vm->m_area.contains(i))
 				continue;
diff --git a/src/mg_ore.h b/src/mg_ore.h
index ffe8cfe50..db204437e 100644
--- a/src/mg_ore.h
+++ b/src/mg_ore.h
@@ -87,6 +87,10 @@ class OreSheet : public Ore {
 public:
 	static const bool NEEDS_NOISE = true;
 
+	u16 column_height_min;
+	u16 column_height_max;
+	float column_midpoint_factor;
+
 	virtual void generate(MMVManip *vm, int mapseed, u32 blockseed,
 		v3s16 nmin, v3s16 nmax, u8 *biomemap);
 };
diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index d30b68054..9050816bb 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -937,8 +937,19 @@ int ModApiMapgen::l_register_ore(lua_State *L)
 	}
 	lua_pop(L, 1);
 
-	if (oretype == ORE_VEIN) {
+	//// Get type-specific parameters
+	if (oretype == ORE_SHEET) {
+		OreSheet *oresheet = (OreSheet *)ore;
+
+		oresheet->column_height_min = getintfield_default(L, index,
+			"column_height_min", 1);
+		oresheet->column_height_max = getintfield_default(L, index,
+			"column_height_max", ore->clust_size);
+		oresheet->column_midpoint_factor = getfloatfield_default(L, index,
+			"column_midpoint_factor", 0.5f);
+	} else if (oretype == ORE_VEIN) {
 		OreVein *orevein = (OreVein *)ore;
+
 		orevein->random_factor = getfloatfield_default(L, index,
 			"random_factor", 1.f);
 	}