vdlib
                                Visibility Determination Library: hierarchical frustum and occlusion culling algorithms
                            
                        How to download and setup vdlib
Open terminal and run command
                                            git clone https://github.com/potato3d/vdlib.git
                                        
                                        git clone is used to create a copy or clone of vdlib 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 vdlib https://github.com/potato3d/vdlib/archive/master.zip
Or simply clone vdlib with SSH
                                            [email protected]:potato3d/vdlib.git                                    
                                    If you have some problems with vdlib
You may open issue on vdlib support forum (system) here: https://github.com/potato3d/vdlib/issuesSimilar to vdlib repositories
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