How to download and setup j3d
Open terminal and run command
                                            git clone https://github.com/janm31415/j3d.git
                                        
                                        git clone is used to create a copy or clone of j3d repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with j3d https://github.com/janm31415/j3d/archive/master.zip
Or simply clone j3d with SSH
                                            [email protected]:janm31415/j3d.git                                    
                                    If you have some problems with j3d
You may open issue on j3d support forum (system) here: https://github.com/janm31415/j3d/issuesSimilar to j3d repositories
Here you may see j3d alternatives and analogs
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