Install textures and meshes

[Thomas-Feldmeier]

After installation of WebotsR2021b, all textures and meshes can be copied into installation folder of webots.

• fixes issues like #3853
• cache can be cleared and is not required anymore

This was tested with Ubuntu 20.04: Webots Guided Tour worked, nothing was added to cache, all textures/meshes where visible. But adding a new node with 'Add New' in Scene Tree is much slower (several seconds).

Linux commands to generate these files: (tested with Ubuntu 20.04)

mkdir /tmp/webotsOffline
mkdir /tmp/webotsOffline/projects
cd /tmp/webotsOffline
echo [1] download Webots R2021b source code...
wget https://github.com/cyberbotics/webots/archive/refs/tags/R2021b.tar.gz
tar xvfz R2021b.tar.gz
echo [2] copy files with url, change url
cd /tmp/webotsOffline/webots-R2021b/projects
grep -rl 'webots://' . | xargs cp --parents -t /tmp/webotsOffline/projects
cd /tmp/webotsOffline/projects
grep -rl 'webots://' . | xargs sed -i -E 's~webots://projects.*(/worlds/|/protos/)~~g'
echo [3] copy textures and meshes folders
cd /tmp/webotsOffline/webots-R2021b/projects
shopt -s globstar
cp -r --parents -t /tmp/webotsOffline/projects **/meshes **/textures

The /tmp/webotsOffline/projects can be zipped and and should work under Windows or macOS too (not tested). Copy the files to webots/project installation folder, overwriting some files which have url's inside. Under Linux:
sudo cp -r /tmp/webotsOffline/projects $WEBOTS_HOME

It would be nice if that zipfile can be downloaded from webots.

[Thomas-Feldmeier]

'add node' is much slower if textures/meshes files are installed.

i changed the script to move textures and meshes subfolder at same level like worlds or protos directory, e.g.

project/abc/worlds/def/textures/ghi.png => project/abc/textures/ghi.png

This way maybe the 'AddNode' would be faster, as protos can only be in protos folder, and other project folders like worlds or textures should not be searched.

mkdir /tmp/webotsOffline
mkdir /tmp/webotsOffline/projects
cd /tmp/webotsOffline
echo [1] download Webots R2021b source code...
wget https://github.com/cyberbotics/webots/archive/refs/tags/R2021b.tar.gz
tar xvfz R2021b.tar.gz
echo [2] copy files with url, change url
cd /tmp/webotsOffline/webots-R2021b/projects
grep -rl 'webots://' . | xargs cp --parents -t /tmp/webotsOffline/projects
cd /tmp/webotsOffline/projects
grep -rl 'webots://' . | xargs sed -i -E 's~webots://(.*)(/worlds/|/protos/)(.*)(meshes/|textures/)~/usr/local/webots/\1/\4\3~g'
echo [3] copy textures and meshes folders
cd /tmp/webotsOffline/webots-R2021b/projects
find . \( -name meshes -o -name textures \) >out
sed -i -E 's~(.*)(/worlds/|/protos/)([^ ]*)(meshes|textures)~mkdir -p /tmp/webotsOffline/projects/\1/\4/\3; cp -r \1\2\3\4/* /tmp/webotsOffline/projects/\1/\4/\3~g' out
bash out

It did not help, still AddNode is slow. It seems that all projects folders are read.