Basing your application on MeshLib

First of all you should make main function like this

#include <MRMesh/MRLog.h>
#include <MRMesh/MRSystem.h>
#include <MRViewer/MRSetupViewer.h>
#include <MRViewer/MRViewer.h>
 
int main( int argc, char** argv )
{
    MR::setupLoggerByDefault();
 
    // Init the viewer
 
    MR::Viewer::LaunchParams launchParams{ .argc = argc, .argv = argv };
    MR::Viewer::parseLaunchParams( launchParams );
    launchParams.name = "Your app name";
 
    MR::ViewerSetup viewerSetup;
    viewerSetup.setupBasePlugins( MR::Viewer::instance() );
    viewerSetup.setupCommonModifiers( MR::Viewer::instance() );
    viewerSetup.setupCommonPlugins( MR::Viewer::instance() );
    viewerSetup.setupSettingsManager( MR::Viewer::instance(), launchParams.name );
    viewerSetup.setupConfiguration( MR::Viewer::instance() );
 
    return MR::launchDefaultViewer( launchParams, viewerSetup );
}

Then you should make your plugins, to find how have a look at State Plugins overview page