verb-nurbs/examples/js/verbToThreeConversion.js

A library for creating and manipulating NURBS surfaces and curves in many languages

// Utility methods to support converting verb.geom types to THREE.Geometry

(function(verb){

    verb.geom.NurbsCurve.prototype.toThreeGeometry = function(){
        return tessellateCurve( this );
    }

    verb.geom.NurbsSurface.prototype.toThreeGeometry = function(){
        return tessellateSurface( this );
    }

    function asVector3(pts){
        return pts.map(function(x){
            return new THREE.Vector3(x[0],x[1],x[2]);
        });
    }

    function tessellateCurve( curve ){
        var geometry = new THREE.Geometry();
        geometry.vertices = asVector3( curve.tessellate() );
        return geometry;
    }

    function tessellateSurface(srf) {

        var tess = srf.tessellate();

        var geometry = new THREE.Geometry();

        geometry.vertices = asVector3( tess.points );

        geometry.faces = tess.faces.map(function(faceIndices){
            var normals = faceIndices.map(function(x){
                var vn = tess.normals[x];
                return new THREE.Vector3( vn[0], vn[1], vn[2] );
            });

            return new THREE.Face3(faceIndices[0],faceIndices[1],faceIndices[2], normals);
        });

        return geometry;
    }

})(verb);