MPPI cost-based visualization

nav2_mppi_controller/include/nav2_mppi_controller/critics/path_align_critic.hpp

@@ -18,6 +18,8 @@
 #include "nav2_mppi_controller/critic_function.hpp"
 #include "nav2_mppi_controller/models/state.hpp"
 #include "nav2_mppi_controller/tools/utils.hpp"
+#include "geometry_msgs/msg/pose_stamped.hpp"
+#include "nav2_ros_common/publisher.hpp"
 
 namespace mppi::critics
 {
@@ -52,6 +54,9 @@ class PathAlignCritic : public CriticFunction
   bool use_path_orientations_{false};
   unsigned int power_{0};
   float weight_{0};
+
+  bool visualize_{false};
+  nav2::Publisher<geometry_msgs::msg::PoseStamped>::SharedPtr target_pose_pub_;
 };
 
 }  // namespace mppi::critics

nav2_mppi_controller/include/nav2_mppi_controller/critics/path_angle_critic.hpp

@@ -20,6 +20,8 @@
 #include "nav2_mppi_controller/models/state.hpp"
 #include "nav2_mppi_controller/tools/utils.hpp"
 #include "nav2_core/controller_exceptions.hpp"
+#include "geometry_msgs/msg/pose_stamped.hpp"
+#include "nav2_ros_common/publisher.hpp"
 
 namespace mppi::critics
 {
@@ -81,6 +83,9 @@ class PathAngleCritic : public CriticFunction
 
   unsigned int power_{0};
   float weight_{0};
+
+  bool visualize_{false};
+  nav2::Publisher<geometry_msgs::msg::PoseStamped>::SharedPtr target_pose_pub_;
 };
 
 }  // namespace mppi::critics

nav2_mppi_controller/include/nav2_mppi_controller/critics/path_follow_critic.hpp

@@ -19,6 +19,8 @@
 #include "nav2_mppi_controller/critic_function.hpp"
 #include "nav2_mppi_controller/models/state.hpp"
 #include "nav2_mppi_controller/tools/utils.hpp"
+#include "geometry_msgs/msg/pose_stamped.hpp"
+#include "nav2_ros_common/publisher.hpp"
 
 namespace mppi::critics
 {
@@ -53,6 +55,9 @@ class PathFollowCritic : public CriticFunction
 
   unsigned int power_{0};
   float weight_{0};
+
+  bool visualize_{false};
+  nav2::Publisher<geometry_msgs::msg::PoseStamped>::SharedPtr target_pose_pub_;
 };
 
 }  // namespace mppi::critics

nav2_mppi_controller/include/nav2_mppi_controller/optimizer.hpp

@@ -118,6 +118,15 @@ class Optimizer
    */
   const models::ControlSequence & getOptimalControlSequence();
 
+  /**
+   * @brief Get the costs for trajectories for visualization
+   * @return Costs array
+   */
+  const Eigen::ArrayXf & getCosts() const
+  {
+    return costs_;
+  }
+
   /**
    * @brief Set the maximum speed based on the speed limits callback
    * @param speed_limit Limit of the speed for use

nav2_mppi_controller/include/nav2_mppi_controller/tools/trajectory_visualizer.hpp

@@ -78,10 +78,14 @@ class TrajectoryVisualizer
     const builtin_interfaces::msg::Time & cmd_stamp);
 
   /**
-    * @brief Add candidate trajectories to visualize
+    * @brief Add candidate trajectories with costs to visualize
     * @param trajectories Candidate trajectories
+    * @param costs Cost array for each trajectory
     */
-  void add(const models::Trajectories & trajectories, const std::string & marker_namespace);
+  void add(
+    const models::Trajectories & trajectories, const Eigen::ArrayXf & costs,
+    const std::string & marker_namespace,
+    const builtin_interfaces::msg::Time & cmd_stamp);
 
   /**
     * @brief Visualize the plan
@@ -109,6 +113,7 @@ class TrajectoryVisualizer
 
   size_t trajectory_step_{0};
   size_t time_step_{0};
+  float time_step_elevation_{0.0f};
 
   rclcpp::Logger logger_{rclcpp::get_logger("MPPIController")};
 };

nav2_mppi_controller/src/controller.cpp

@@ -140,7 +140,12 @@ void MPPIController::visualize(
   const builtin_interfaces::msg::Time & cmd_stamp,
   const Eigen::ArrayXXf & optimal_trajectory)
 {
-  trajectory_visualizer_.add(optimizer_.getGeneratedTrajectories(), "Candidate Trajectories");
+  trajectory_visualizer_.add(
+    optimizer_.getGeneratedTrajectories(),
+    optimizer_.getCosts(),
+    "Candidate Trajectories Cost",
+    cmd_stamp);
+
   trajectory_visualizer_.add(optimal_trajectory, "Optimal Trajectory", cmd_stamp);
   trajectory_visualizer_.visualize(std::move(transformed_plan));
 }

nav2_mppi_controller/src/critics/path_align_critic.cpp

@@ -30,6 +30,16 @@ void PathAlignCritic::initialize()
     threshold_to_consider_,
     "threshold_to_consider", 0.5f);
   getParam(use_path_orientations_, "use_path_orientations", false);
+  getParam(visualize_, "visualize", false);
+
+  if (visualize_) {
+    auto node = parent_.lock();
+    if (node) {
+      target_pose_pub_ = node->create_publisher<geometry_msgs::msg::PoseStamped>(
+        "/PathAlignCritic/furthest_reached_path_point", 1);
+      target_pose_pub_->on_activate();
+    }
+  }
 
   RCLCPP_INFO(
     logger_,
@@ -48,6 +58,20 @@ void PathAlignCritic::score(CriticData & data)
   // Up to furthest only, closest path point is always 0 from path handler
   const size_t path_segments_count = *data.furthest_reached_path_point;
   float path_segments_flt = static_cast<float>(path_segments_count);
+
+  // Visualize target pose if enabled
+  if (visualize_ && path_segments_count > 0) {
+    auto node = parent_.lock();
+    geometry_msgs::msg::PoseStamped target_pose;
+    target_pose.header.frame_id = costmap_ros_->getGlobalFrameID();
+    target_pose.header.stamp = node->get_clock()->now();
+    target_pose.pose.position.x = data.path.x(path_segments_count);
+    target_pose.pose.position.y = data.path.y(path_segments_count);
+    target_pose.pose.position.z = 0.0;
+    target_pose.pose.orientation.w = 1.0;
+    target_pose_pub_->publish(target_pose);
+  }
+
   if (path_segments_count < offset_from_furthest_) {
     return;
   }

nav2_mppi_controller/src/critics/path_angle_critic.cpp

@@ -41,6 +41,7 @@ void PathAngleCritic::initialize()
   getParam(
     max_angle_to_furthest_,
     "max_angle_to_furthest", 0.785398f);
+  getParam(visualize_, "visualize", false);
 
   int mode = 0;
   getParam(mode, "mode", mode);
@@ -53,6 +54,15 @@ void PathAngleCritic::initialize()
       "don't allow for reversing! Setting mode to forward preference.");
   }
 
+  if (visualize_) {
+    auto node = parent_.lock();
+    if (node) {
+      target_pose_pub_ = node->create_publisher<geometry_msgs::msg::PoseStamped>(
+      "PathAngleCritic/furthest_reached_path_point", 1);
+      target_pose_pub_->on_activate();
+    }
+  }
+
   RCLCPP_INFO(
     logger_,
     "PathAngleCritic instantiated with %d power and %f weight. Mode set to: %s",
@@ -75,6 +85,19 @@ void PathAngleCritic::score(CriticData & data)
   const float goal_yaw = data.path.yaws(offsetted_idx);
   const geometry_msgs::msg::Pose & pose = data.state.pose.pose;
 
+  // Visualize target pose if enabled
+  if (visualize_) {
+    auto node = parent_.lock();
+    geometry_msgs::msg::PoseStamped target_pose;
+    target_pose.header.frame_id = costmap_ros_->getGlobalFrameID();
+    target_pose.header.stamp = node->get_clock()->now();
+    target_pose.pose.position.x = goal_x;
+    target_pose.pose.position.y = goal_y;
+    target_pose.pose.position.z = 0.0;
+    target_pose.pose.orientation.w = 1.0;
+    target_pose_pub_->publish(target_pose);
+  }
+
   switch (mode_) {
     case PathAngleMode::FORWARD_PREFERENCE:
       if (utils::posePointAngle(pose, goal_x, goal_y, true) < max_angle_to_furthest_) {

nav2_mppi_controller/src/critics/path_follow_critic.cpp

@@ -29,6 +29,16 @@ void PathFollowCritic::initialize()
   getParam(offset_from_furthest_, "offset_from_furthest", 6);
   getParam(power_, "cost_power", 1);
   getParam(weight_, "cost_weight", 5.0f);
+  getParam(visualize_, "visualize", false);
+
+  if (visualize_) {
+    auto node = parent_.lock();
+    if (node) {
+      target_pose_pub_ = node->create_publisher<geometry_msgs::msg::PoseStamped>(
+        "/PathFollowCritic/furthest_reached_path_point", 1);
+      target_pose_pub_->on_activate();
+    }
+  }
 }
 
 void PathFollowCritic::score(CriticData & data)
@@ -60,6 +70,18 @@ void PathFollowCritic::score(CriticData & data)
 
   const auto path_x = data.path.x(offsetted_idx);
   const auto path_y = data.path.y(offsetted_idx);
+  // Visualize target pose if enabled
+  if (visualize_) {
+    auto node = parent_.lock();
+    geometry_msgs::msg::PoseStamped target_pose;
+    target_pose.header.frame_id = costmap_ros_->getGlobalFrameID();
+    target_pose.header.stamp = node->get_clock()->now();
+    target_pose.pose.position.x = path_x;
+    target_pose.pose.position.y = path_y;
+    target_pose.pose.position.z = 0.0;
+    target_pose.pose.orientation.w = 1.0;
+    target_pose_pub_->publish(target_pose);
+  }
 
   const int && rightmost_idx = data.trajectories.x.cols() - 1;
   const auto last_x = data.trajectories.x.col(rightmost_idx);

nav2_mppi_controller/src/trajectory_visualizer.cpp

@@ -13,6 +13,8 @@
 // limitations under the License.
 
 #include <memory>
+#include <vector>
+#include <algorithm>
 #include "nav2_mppi_controller/tools/trajectory_visualizer.hpp"
 
 namespace mppi
@@ -36,6 +38,7 @@ void TrajectoryVisualizer::on_configure(
 
   getParam(trajectory_step_, "trajectory_step", 5);
   getParam(time_step_, "time_step", 3);
+  getParam(time_step_elevation_, "time_step_elevation", 0.0f);
 
   reset();
 }
@@ -104,27 +107,95 @@ void TrajectoryVisualizer::add(
 }
 
 void TrajectoryVisualizer::add(
-  const models::Trajectories & trajectories, const std::string & marker_namespace)
+  const models::Trajectories & trajectories, const Eigen::ArrayXf & costs,
+  const std::string & marker_namespace,
+  const builtin_interfaces::msg::Time & cmd_stamp)
 {
   size_t n_rows = trajectories.x.rows();
   size_t n_cols = trajectories.x.cols();
-  const float shape_1 = static_cast<float>(n_cols);
-  points_->markers.reserve(floor(n_rows / trajectory_step_) * floor(n_cols * time_step_));
+  points_->markers.reserve(n_rows / trajectory_step_);
 
-  for (size_t i = 0; i < n_rows; i += trajectory_step_) {
-    for (size_t j = 0; j < n_cols; j += time_step_) {
-      const float j_flt = static_cast<float>(j);
-      float blue_component = 1.0f - j_flt / shape_1;
-      float green_component = j_flt / shape_1;
+  // Use percentile-based normalization to handle outliers
+  // Sort costs to find percentiles
+  std::vector<float> sorted_costs(costs.data(), costs.data() + costs.size());
+  std::sort(sorted_costs.begin(), sorted_costs.end());
 
-      auto pose = utils::createPose(trajectories.x(i, j), trajectories.y(i, j), 0.03);
-      auto scale = utils::createScale(0.03, 0.03, 0.03);
-      auto color = utils::createColor(0, green_component, blue_component, 1);
-      auto marker = utils::createMarker(
-        marker_id_++, pose, scale, color, frame_id_, marker_namespace);
+  // Use 10th and 90th percentile for robust color mapping
+  size_t idx_5th = static_cast<size_t>(sorted_costs.size() * 0.1);
+  size_t idx_95th = static_cast<size_t>(sorted_costs.size() * 0.9);
 
-      points_->markers.push_back(marker);
+  float min_cost = sorted_costs[idx_5th];
+  float max_cost = sorted_costs[idx_95th];
+  float cost_range = max_cost - min_cost;
+
+  // Avoid division by zero
+  if (cost_range < 1e-6f) {
+    cost_range = 1.0f;
+  }
+
+  for (size_t i = 0; i < n_rows; i += trajectory_step_) {
+    float red_component, green_component, blue_component;
+
+    // Normalize cost using percentile-based range, clamping outliers
+    float normalized_cost = (costs(i) - min_cost) / cost_range;
+
+    // Clamp to [0, 1] range (handles outliers beyond percentiles)
+    normalized_cost = std::max(0.0f, std::min(1.0f, normalized_cost));
+
+    // Apply power function for better visual distribution
+    normalized_cost = std::pow(normalized_cost, 0.5f);
+
+    // Color scheme with smooth gradient:
+    // Green (0.0) -> Yellow-Green (0.25) -> Yellow (0.5) -> Orange (0.75) -> Red (1.0)
+    // Very high outlier costs (>95th percentile) will be clamped to red
+    blue_component = 0.0f;
+
+    if (normalized_cost < 0.5f) {
+      // Transition from Green to Yellow (0.0 - 0.5)
+      float t = normalized_cost * 2.0f;  // Scale to [0, 1]
+      red_component = t;
+      green_component = 1.0f;
+    } else {
+      // Transition from Yellow to Red (0.5 - 1.0)
+      float t = (normalized_cost - 0.5f) * 2.0f;  // Scale to [0, 1]
+      red_component = 1.0f;
+      green_component = 1.0f - t;
     }
+
+    // Create line strip marker for this trajectory
+    visualization_msgs::msg::Marker marker;
+    marker.header.frame_id = frame_id_;
+    marker.header.stamp = cmd_stamp;
+    marker.ns = marker_namespace;
+    marker.id = marker_id_++;
+    marker.type = visualization_msgs::msg::Marker::LINE_STRIP;
+    marker.action = visualization_msgs::msg::Marker::ADD;
+    marker.pose.orientation.w = 1.0;
+
+    // Set line width
+    marker.scale.x = 0.01;  // Line width
+
+    // Set color for entire trajectory
+    marker.color.r = red_component;
+    marker.color.g = green_component;
+    marker.color.b = blue_component;
+    marker.color.a = 0.8f;  // Slightly transparent
+
+    // Add all points in this trajectory to the line strip
+    for (size_t j = 0; j < n_cols; j += time_step_) {
+      geometry_msgs::msg::Point point;
+      point.x = trajectories.x(i, j);
+      point.y = trajectories.y(i, j);
+      // Increment z by time_step_elevation_ for each time step
+      if (time_step_elevation_ > 0.0f) {
+        point.z = static_cast<float>(j) * time_step_elevation_;
+      } else {
+        point.z = 0.0f;
+      }
+      marker.points.push_back(point);
+    }
+
+    points_->markers.push_back(marker);
   }
 }
 

nav2_mppi_controller/test/trajectory_visualizer_tests.cpp

@@ -147,10 +147,13 @@ TEST(TrajectoryVisualizerTests, VisCandidateTrajectories)
   candidate_trajectories.y = Eigen::ArrayXXf::Ones(200, 12);
   candidate_trajectories.yaws = Eigen::ArrayXXf::Ones(200, 12);
 
+  // Create costs array for the trajectories
+  Eigen::ArrayXf costs = Eigen::ArrayXf::LinSpaced(200, 0.0f, 100.0f);
+
   TrajectoryVisualizer vis;
   vis.on_configure(node, "my_name", "fkmap", parameters_handler.get());
   vis.on_activate();
-  vis.add(candidate_trajectories, "Candidate Trajectories");
+  vis.add(candidate_trajectories, costs, "Candidate Trajectories", cmd_stamp);
   nav_msgs::msg::Path bogus_path;
   vis.visualize(bogus_path);