nray
                                Nray is a multithreaded physically based path tracer. It reads a scene file that describes a camera, a lighting environment and several objects. It can render spheres and triangle meshes (loaded as obj files) as well as implicit surfaces (sdf)
                            
                        How to download and setup nray
Open terminal and run command
                                            git clone https://github.com/ngrafx/nray.git
                                        
                                        git clone is used to create a copy or clone of nray 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 nray https://github.com/ngrafx/nray/archive/master.zip
Or simply clone nray with SSH
                                            [email protected]:ngrafx/nray.git                                    
                                    If you have some problems with nray
You may open issue on nray support forum (system) here: https://github.com/ngrafx/nray/issuesSimilar to nray repositories
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