The TiGL Viewer is not included in RCE anymore, but has to be downloaded and installed separately. Please visit https://dlr-sc.github.io/tigl/pages/download.html in order to obtain a copy. Once installed, add the following lines to your configuration file and restart RCE:
"thirdPartyIntegration": {
"tiglViewer" : {
"binaryPath" : "/path/to/tiglViewer.exe"
}
}
For additional configuration options for the TiGL Viewer refer to the configuration reference.