javascript - How to reverse the direction of applying texture in the object CylinderGeometry? -


how reverse direction of applying texture in object cylindergeometry?

var obj = new three.mesh(     new three.cylindergeometry(20, 15, 1, 20),     new three.meshlambertmaterial({color: 0x000000}) //the material later changed correct );

thank in advance :)

this function works:

        var inverttextureoncylindergeometry = function(obj) {             var facevertexes = obj.geometry.facevertexuvs[0];             var facevertexeslength = facevertexes.length;             var divisiont = 1 / (facevertexeslength * 0.25);             facevertexes.map(function(face, index) {                 if (index < 0.5*facevertexeslength) {                     var thisindexdivision = [                         math.floor(index/2) * divisiont,                         math.ceil((index+divisiont)/2) * divisiont                     ];                     if (index % 2) {                         face[0].set(1, thisindexdivision[0]);                         face[1].set(1, thisindexdivision[1]);                         face[2].set(0, thisindexdivision[1]);                     } else {                         face[0].set(0, thisindexdivision[0]);                         face[1].set(1, thisindexdivision[0]);                         face[2].set(0, thisindexdivision[1]);                     }                 }             });             obj.geometry.uvsneedupdate = true;         };

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