diff --git a/src/maths/util.hpp b/src/maths/util.hpp
index a5302980..5f08253f 100644
--- a/src/maths/util.hpp
+++ b/src/maths/util.hpp
@@ -78,12 +78,24 @@ namespace util {
             (b.z - a.z) * (b.z - a.z);
     }
 
+    /// @return integer square of distance between two points
+    inline int distance2(int ax, int ay, int az, int bx, int by, int bz) {
+        return (bx - ax) * (bx - ax) +
+               (by - ay) * (by - ay) +
+               (bz - az) * (bz - az);
+    }
+
     /// @return integer square of vector length
     /// @note glm::length2 does not support integer vectors
     inline int length2(const glm::ivec3& a) {
         return a.x * a.x + a.y * a.y + a.z * a.z;
     }
 
+    /// @return integer square of vector length
+    inline int length2(int x, int y, int z) {
+        return x * x + y * y + z * z;
+    }
+
     /// @brief Find nearest point on segment to given
     /// @param a segment point A
     /// @param b segment point B
diff --git a/src/world/generator/WorldGenerator.cpp b/src/world/generator/WorldGenerator.cpp
index 301049b7..b29914c7 100644
--- a/src/world/generator/WorldGenerator.cpp
+++ b/src/world/generator/WorldGenerator.cpp
@@ -380,24 +380,30 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
             }
         }
     }
+    generateLines(prototype, voxels, chunkX, chunkZ);
+}
+
+void WorldGenerator::generateLines(
+    const ChunkPrototype& prototype, voxel* voxels, int chunkX, int chunkZ
+) {
     for (const auto& line : prototype.lines) {
         int cgx = chunkX * CHUNK_W;
         int cgz = chunkZ * CHUNK_D;
 
         int radius = line.radius;
 
-        int minX = std::max(0, std::min(line.a.x-radius-cgx, line.b.x-radius-cgx));
-        int maxX = std::min(CHUNK_W, std::max(line.a.x+radius-cgx, line.b.x+radius-cgx));
-
-        int minZ = std::max(0, std::min(line.a.z-radius-cgz, line.b.z-radius-cgz));
-        int maxZ = std::min(CHUNK_D, std::max(line.a.z+radius-cgz, line.b.z+radius-cgz));
-
-        int minY = std::max(0, std::min(line.a.y-radius, line.b.y-radius));
-        int maxY = std::min(CHUNK_H, std::max(line.a.y+radius, line.b.y+radius));
-
         auto a = line.a;
         auto b = line.b;
 
+        int minX = std::max(0, std::min(a.x-radius-cgx, b.x-radius-cgx));
+        int maxX = std::min(CHUNK_W, std::max(a.x+radius-cgx, b.x+radius-cgx));
+
+        int minZ = std::max(0, std::min(a.z-radius-cgz, b.z-radius-cgz));
+        int maxZ = std::min(CHUNK_D, std::max(a.z+radius-cgz, b.z+radius-cgz));
+
+        int minY = std::max(0, std::min(a.y-radius, b.y-radius));
+        int maxY = std::min(CHUNK_H, std::max(a.y+radius, b.y+radius));
+
         for (int y = minY; y < maxY; y++) {
             for (int z = minZ; z < maxZ; z++) {
                 for (int x = minX; x < maxX; x++) {
@@ -405,7 +411,8 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
                     int gz = z + cgz;
                     glm::ivec3 point {gx, y, gz};
                     glm::ivec3 closest = util::closest_point_on_segment(
-                        a, b, point);
+                        a, b, point
+                    );
                     if (util::distance2(closest, point) <= radius*radius) {
                         voxels[vox_index(x, y, z)] = {line.block, {}};
                     }
diff --git a/src/world/generator/WorldGenerator.hpp b/src/world/generator/WorldGenerator.hpp
index a503c312..784b4329 100644
--- a/src/world/generator/WorldGenerator.hpp
+++ b/src/world/generator/WorldGenerator.hpp
@@ -76,6 +76,10 @@ class WorldGenerator {
     );
 
     void placeLine(const LinePlacement& line);
+
+    void generateLines(
+        const ChunkPrototype& prototype, voxel* voxels, int x, int z
+    );
 public:
     WorldGenerator(
         const GeneratorDef& def,