Solved a bug with negative x.

src/obstacle_detection_normals_alg.cpp

@@ -62,7 +62,7 @@ void ObstacleDetectionNormalsAlgorithm::cloud_all(const pcl::PointCloud<pcl::Poi
   {
     for (size_t colIndex=0; colIndex<cloud_out->width; ++colIndex, ++pointIndex)
     {
-      if (cloud_out->points[pointIndex].x > this->config_.filter_min_dist)
+      if (fabs(cloud_out->points[pointIndex].x) > this->config_.filter_min_dist)
       {
         if (fabs(cloud_out->points[pointIndex].normal_z) > cos(this->config_.max_inc))
         {