Error running the Demo

[samuel-cerezo]

Hi,

When i followed the steps for running the demo, i obtained

Traceback (most recent call last):
  File "visualizer.py", line 34, in <module>
    scalemat = np.load(f'Datasets/processed/Replica/scan{scanid}/cameras.npz')['scale_mat_0']
  File "/home/samuel/anaconda3/envs/nicer-slam/lib/python3.8/site-packages/numpy/lib/npyio.py", line 407, in load
    fid = stack.enter_context(open(os_fspath(file), "rb"))
FileNotFoundError: [Errno 2] No such file or directory: 'Datasets/processed/Replica/scan3/cameras.npz'

Can you help me please?

Thanks!

[OnHaDe]

Looks like you are using the wrong configuration.

[YerldSHO]

I also faced this problem. Haven't found a solution yet

[YerldSHO]

Where is Datasets/processed/Replica/scan{scanid}/cameras.npz? The error is that the file does not exist at the specified path

[samuel-cerezo]

Exactly, the file is missing

[OnHaDe]

What are the steps you followed?
Demo 1 and 2 use /Datasets/processed/Demo as their data path.
The fact that you get the Replica path in your Error suggests the wrong config file

Call the visualizer script with --output "path"
The path needs to contain the word 'demo'
This is because of:
https://github.com/cvg/nicer-slam/blob/main/visualizer.py#L47-L49

[YerldSHO]

It's not entirely clear what you meant.

bash scripts/download_vis_replica_room2.sh
OUTPUT_FOLDER=exps/replica_3/2024_02_27_00_12_45sample_vis
python visualizer.py --output $OUTPUT_FOLDER

your example ->
bash scripts/download_vis_replica_room2.sh
OUTPUT_FOLDER=exps/replica_3/2024_02_27_00_12_45sample_vis replica
python visualizer.py --output $OUTPUT_FOLDER ???

[OnHaDe]

I answered under the assumption you are trying to run the demo and not the Replica dataset.
The Replica Dataset requires you to run the preprocessing first, which creates the camera.npz file (Unless the Replica dataset comes with one in which case you manually have to move it into the correct directory). I don't know why that is not pointed out except for the "Run" section of the Readme

[Zzh2000]

You are right, cameras.npz is generated during the Replica dataset preprocessing, when running Demo many users will not have this file. I will later directly provide a cameras.npz for demo. Sorry for this confusion.