Now generating roads on terrain. Still some trouble left.

modules/world/world_generator.h

@@ -52,7 +52,7 @@ private:
 	static void _bind_methods();
 protected:
 	template <typename Height_F>
-	void generate(VoxelBuffer &out_buffer, Height_F height_func, Vector3i origin, int lod) {
+	Result generate(VoxelBufferInternal &out_buffer, Height_F height_func, Vector3i origin, int lod) {
 
 		const int channel = _channel;
 		const Vector3i bs = out_buffer.get_size();
@@ -60,12 +60,16 @@ protected:
 
 		if (origin.y > get_height_start() + get_height_range()) {
 			// The bottom of the block is above the highest ground can go (default is air)
-			return;
+			Result result;
+			result.max_lod_hint = true;
+			return result;
 		}
 		if (origin.y + (bs.y << lod) < get_height_start()) {
 			// The top of the block is below the lowest ground can go
 			out_buffer.clear_channel(_channel, use_sdf ? 0 : _matter_type);
-			return;
+			Result result;
+			result.max_lod_hint = true;
+			return result;
 		}
 
 		const int stride = 1 << lod;
@@ -111,6 +115,8 @@ protected:
 				} // for x
 			} // for z
 		} // use_sdf
+
+		return Result();
 	}
 
 private: