if you are going to use plane geometry, you can try the following link ...
Edgehelper
var geometry = new THREE.PlaneGeometry(10, 10, 10,10);
var material = new THREE.MeshLambertMaterial({color:0xff0000,opacity:0.2,transparent:true,overdraw:0.5});
for (var i = 0; i < 1; i ++) { var mesh = new THREE.Mesh(geometry, material);
mesh.position.x = i*20; mesh.position.y = 0;
check the link ..
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