im trying to create a simple 3d game with boxgeometries in three.js.
Everything works good but im not getting sharp edges on those boxes, no matter on mobile browser (safari) or on chrome on my macbook. See the screenshot below.

What i tried so far: set antialias on renderer to true (helps but still no straight lines from rotated cubes), set renderer pixel ratio (touch click intersects dont work then, and still pixelated lines.) Also tried the FXAA shader but result was not better. Using perspective camera, Boxgeometry with Basic Material.
My Question is, is it with three.js even possible to have sharp edges on those cubes ? especially when they are pretty small (like 30 equal sized on mobile screen).
Using three.js version 87, chrome 68, newest mobile safari.
Update: This is my renderer settings:
renderer = new THREE.WebGLRenderer({
alpha: true,
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setPixelRatio(window.devicePixelRatio); // doesnt do the trick and messes up the threex domevent touch inputs
document.body.appendChild(renderer.domElement);
canvas = document.getElementsByTagName('canvas')[0];
window.onresize = resizeCanvas;
resizeCanvas();
function resizeCanvas() {
canvas.style.width = '100%';
canvas.style.height = '100%';
canvas.width = canvas.offsetWidth;
canvas.height = canvas.offsetHeight;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
}
in my css i only have canvas { height: 100%; width: 100%; }
update2: demo link here https://jsfiddle.net/roxanfc4/11/