mkdir -p output/vis/Replica
cd output/vis/Replica
# you can also download the room1.zip manually through
# link: https://caiyun.139.com/m/i?1A5CwEM2ZjTNz  password: Z2o7
wget https://cvg-data.inf.ethz.ch/nice-slam/vis/Replica/room1.zip
unzip room1.zip