Currently, I'm involved in a three.js project where I need to display all edges of geometries, even when those edges intersect with surfaces of other objects.
Below is the code snippet that showcases my dilemma:
var camera, scene, renderer, material, stats, group, wireframeMaterial;
init();
animate();
function init() {
// Renderer.
renderer = new THREE.WebGLRenderer({antialias: true, alpha:true,clearAlpha:0,clearColor: 0xff0000});
//renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
// Add renderer to page
document.body.appendChild(renderer.domElement);
// Create camera.
camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.z = 400;
// Create scene.
scene = new THREE.Scene();
group=new THREE.Group()
// Create material
material = new THREE.MeshBasicMaterial();
wireframeMaterial=new THREE.LineBasicMaterial( { color: 0x000000, side:THREE.FrontSide ,transparent:false,opacity:1,linewidth: 1 })
// Create cube and add to scene.
var geometry = new THREE.BoxGeometry(200, 200, 200);
var mesh1 = new THREE.Mesh(geometry, material);
group.add(mesh1);
var geometry2 = new THREE.BoxGeometry(100,100,100);
var mesh2 = new THREE.Mesh(geometry2, material);
group.add(mesh2);
mesh2.position.fromArray([0,150,0])
var edges = new THREE.EdgesGeometry( geometry );
var line = new THREE.LineSegments( edges, wireframeMaterial );
mesh1.add( line );
var edges2 = new THREE.EdgesGeometry( geometry2 );
var line2 = new THREE.LineSegments( edges2, wireframeMaterial );
mesh2.add( line2 );
scene.add(group)
// Add listener for window resize.
window.addEventListener('resize', onWindowResize, false);
}
function animate() {
requestAnimationFrame(animate);
group.rotation.x += 0.005;
group.rotation.y += 0.01;
renderer.render(scene, camera);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}body {
padding: 0;
margin: 0;
}
canvas {
display: block;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/97/three.min.js"></script>On the fiddle code, there are two cubes stacked on top of each other. I am aiming to make the bottom edges of the smaller cube visible. One approach is to set the mesh basic material as transparent. However, this method would also reveal edges that are behind the cubes themselves, which is not permissible in the project.
Are there any alternative solutions available to address this issue?