add chunk_height parameter to place_structures

res/content/base/generators/demo.files/script.lua

@@ -1,10 +1,10 @@
-function place_structures(x, z, w, d, seed, hmap)
+function place_structures(x, z, w, d, seed, hmap, chunk_height)
     local placements = {}
     for i=1,10 do
         local sx = math.random() * w
         local sz = math.random() * d
-        local sy = math.random() * 128
+        local sy = math.random() * (chunk_height * 0.5)
-        if sy < hmap:at(sx, sz) * 256 - 6 then
+        if sy < hmap:at(sx, sz) * chunk_height - 6 then
             table.insert(placements, {"coal_ore0", {sx, sy, sz}, math.random()*4})
         end
     end

src/logic/scripting/scripting_world_generation.cpp

@@ -76,7 +76,7 @@ public:
 
     std::vector<StructurePlacement> placeStructures(
         const glm::ivec2& offset, const glm::ivec2& size, uint64_t seed,
-        const std::shared_ptr<Heightmap>& heightmap
+        const std::shared_ptr<Heightmap>& heightmap, uint chunkHeight
     ) override {
         std::vector<StructurePlacement> placements;
         
@@ -88,7 +88,8 @@ public:
             lua::pushivec_stack(L, size);
             lua::pushinteger(L, seed);
             lua::newuserdata<lua::LuaHeightmap>(L, heightmap);
-            if (lua::call_nothrow(L, 6, 1)) {
+            lua::pushinteger(L, chunkHeight);
+            if (lua::call_nothrow(L, 7, 1)) {
                 int len = lua::objlen(L, -1);
                 for (int i = 1; i <= len; i++) {
                     lua::rawgeti(L, i);

src/world/generator/GeneratorDef.hpp

@@ -155,10 +155,11 @@ public:
     /// @param size size of the area (blocks)
     /// @param seed world seed
     /// @param heightmap area heightmap
+    /// @param chunkHeight chunk height to use as heights multiplier
     /// @return structure placements
     virtual std::vector<StructurePlacement> placeStructures(
         const glm::ivec2& offset, const glm::ivec2& size, uint64_t seed,
-        const std::shared_ptr<Heightmap>& heightmap) = 0;
+        const std::shared_ptr<Heightmap>& heightmap, uint chunkHeight) = 0;
 };
 
 /// @brief Structure voxel fragments and metadata

src/world/generator/WorldGenerator.cpp

@@ -177,7 +177,7 @@ void WorldGenerator::generateStructures(
 
     util::concat(prototype.structures, def.script->placeStructures(
         {chunkX * CHUNK_W, chunkZ * CHUNK_D}, {CHUNK_W, CHUNK_D}, seed,
-        heightmap
+        heightmap, CHUNK_H
     ));
     for (const auto& placement : prototype.structures) {
         const auto& offset = placement.position;