How to use the fold.filter function in fold

foldData.edges_vertices.push([edge[0], edge[1]]);
            foldData.edges_assignment.push("U");
            foldData.edges_foldAngles.push(null);
        });
        _.each(_cutsRaw, function(edge){
            foldData.edges_vertices.push([edge[0], edge[1]]);
            foldData.edges_assignment.push("C");
            foldData.edges_foldAngles.push(null);
        });

        if (foldData.vertices_coords.length == 0 || foldData.edges_vertices.length == 0){
            globals.warn("No valid geometry found in SVG, be sure to ungroup all and remove all clipping masks.");
            return false;
        }

        foldData = FOLD.filter.collapseNearbyVertices(foldData, globals.vertTol);
        foldData = FOLD.filter.removeLoopEdges(foldData);//remove edges that points to same vertex
        foldData = FOLD.filter.removeDuplicateEdges_vertices(foldData);//remove duplicate edges
        // foldData = FOLD.filter.subdivideCrossingEdges_vertices(foldData, globals.vertTol);//find intersections and add vertices/edges

        foldData = findIntersections(foldData, globals.vertTol);
        //cleanup after intersection operation
        foldData = FOLD.filter.collapseNearbyVertices(foldData, globals.vertTol);
        foldData = FOLD.filter.removeLoopEdges(foldData);//remove edges that points to same vertex
        foldData = FOLD.filter.removeDuplicateEdges_vertices(foldData);//remove duplicate edges

        foldData = FOLD.convert.edges_vertices_to_vertices_vertices_unsorted(foldData);
        foldData = removeStrayVertices(foldData);//delete stray anchors
        foldData = removeRedundantVertices(foldData, 0.01);//remove vertices that split edge

        foldData.vertices_vertices = FOLD.convert.sort_vertices_vertices(foldData);
        foldData = FOLD.convert.vertices_vertices_to_faces_vertices(foldData);

if (!fold.vertices_vertices) {
            console.warn("compute vertices_vertices first");
            fold = FOLD.convert.edges_vertices_to_vertices_vertices_unsorted(fold);
        }
        var numStrays = 0;
        var old2new = [];
        var newIndex = 0;
        for (var i=0;i

function processFold(fold, returnCreaseParams){

        rawFold = JSON.parse(JSON.stringify(fold));//save pre-triangulated for for save later
        //make 3d
        for (var i=0;i0) {
            fold = splitCuts(fold);
            fold = FOLD.convert.edges_vertices_to_vertices_vertices_unsorted(fold);
            fold = removeRedundantVertices(fold, 0.01);//remove vertices that split edge
        }
        delete fold.vertices_vertices;
        delete fold.vertices_edges;

        foldData = triangulatePolys(fold, true);

        for (var i=0;i

delete fold.vertices_vertices;
        delete fold.vertices_edges;

        foldData = triangulatePolys(fold, true);

        for (var i=0;i