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This preview generation happens on the cluster nodes. A Chrome browser instance is started on a virtual framebuffer device. The model is loaded by the browser and then a screenshot of the browser is taken.
The software can be obtained by executing
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git clone https://dev.fiz-karlsruhe.de/stash/scm/ddb/3d-screenshot-generator.git |
In order for this the scripts to work the follwing packages things need to be installed done on the cluster nodes:
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sudo yum install npm xorg-x11-server-Xvfb atk java-atk-wrapper at-spi2-atk gtk3 libXt ImageMagick # Register and start Xvfb service sudo echo " [Unit] Description=Xvfb headless plotting After=network.target [Service] User=root ExecStart=/usr/bin/Xvfb :0 -screen 0 1280x1024x24 [Install] WantedBy=multi-user.target Alias=Xvfb.service Alias=xvfbd.service " > /etc/systemd/system/xvfb.service sudo systemctl daemon-reload sudo systemctl enable xvfb sudo systemctl start xvfb |
The configuration in appconfig.json needs to be adapted.
Please also refer to the projects Readme file, especially for CentOS 7 systems.