improve readme

README.md

@@ -95,7 +95,7 @@ For more detailed instructions, please refer to [TRAINING.md](TRAINING.md).
 Training data is generated from the [Matterport 3D](https://github.com/niessner/Matterport), [Carla](https://carla.org/) and [NVIDIA Warehouse](https://docs.omniverse.nvidia.com/isaacsim/latest/tutorial_static_assets.html) using IsaacLab. For detailed instruction on how to install the extension and run the data collection script, please see [here](omniverse/README.md)
 
 1. Build Cost-Map <br>
-The first step in training the policy is to build a cost-map from the available depth and semantic data. A cost-map is a representation of the environment where each cell is assigned a cost value indicating its traversability. The cost-map guides the optimization, therefore, is required to be differentiable. Cost-maps are built using the [cost-builder](viplanner/cost_builder.py) with configs [here](viplanner/config/costmap_cfg.py), given a pointcloud of the environment with semantic information (either from simultion or real-world information).
+The first step in training the policy is to build a cost-map from the available depth and semantic data. A cost-map is a representation of the environment where each cell is assigned a cost value indicating its traversability. The cost-map guides the optimization, therefore, is required to be differentiable. Cost-maps are built using the [cost-builder](viplanner/cost_builder.py) with configs [here](viplanner/config/costmap_cfg.py), given a pointcloud of the environment with semantic information (either from simultion or real-world information). The point-cloud of the simulated environments can be generated with the [reconstruction-script](viplanner/depth_reconstruct.py) with config [here](viplanner/config/costmap_cfg.py).
 
 2. Training <br>
 Once the cost-map is constructed, the next step is to train the policy. The policy is a machine learning model that learns to make decisions based on the depth and semantic measurements. An example training script can be found [here](viplanner/train.py) with configs [here](viplanner/config/learning_cfg.py)

TRAINING.md

@@ -2,6 +2,12 @@
 
 Here an overview of the steps involved in training the policy is provided.
 
+
+## Data Generation
+
+For the data generation, please follow the instruction given in [here](omniverse/README.md).
+
+
 ## Cost-Map Building
 
 Cost-Map building is an essential step in guiding optimization and representing the environment.
@@ -28,13 +34,14 @@ If depth and semantic images of the simulation are available, then first 3D reco
         ├── xxxx.png                            # images saved with 4 digits, e.g. 0000.png
     ```
 
-    when both depth and semantic images are available, then define sem_suffic and depth_suffix in ReconstructionCfg to differentiate between the two with the following structure:
+    In the case that the semantic and depth images have an offset in their position (as typical on some robotic platforms),
+    define a `sem_suffic` and `depth_suffix` in `ReconstructionCfg` to differentiate between the two with the following structure:
 
     ``` graphql
     env_name
     ├── camera_extrinsic{depth_suffix}.txt      # format: x y z qx qy qz qw
     ├── camera_extrinsic{sem_suffix}.txt        # format: x y z qx qy qz qw
-    ├── intrinsics.txt                          # P-Matrix for intrinsics of depth and semantic images
+    ├── intrinsics.txt                          # P-Matrix for intrinsics of depth and semantic images (depth first)
     ├── depth                                   # either png and/ or npy, if both npy is used
     |   ├── xxxx{depth_suffix}.png              # images saved with 4 digits, e.g. 0000.png
     |   ├── xxxx{depth_suffix}.npy              # arrays saved with 4 digits, e.g. 0000.npy
@@ -49,7 +56,7 @@ If depth and semantic images of the simulation are available, then first 3D reco
 
 3. **Cost-Building** <br>
 
-    Fully automated, either a geometric or semantic cost map can be generated running the following command:
+    Either a geometric or semantic cost map can be generated running the following command:
 
     ```
     python viplanner/cost_builder.py
@@ -72,7 +79,6 @@ If depth and semantic images of the simulation are available, then first 3D reco
     ```
 
 
-
 ## Training
 
 Configurations of the training given in [TrainCfg](viplanner/config/learning_cfg.py). Training can be started using the example training script [train.py](viplanner/train.py).