Three.js / WebGL - transparent planes hiding other planes behind them

Question

When you have two planes in Three.js / WebGL and one or both of them are transparent, sometimes the plane behind will be hidden by the transparent plane above. Why is this?<

Answer 1

fwiw, if you have lots of parallel planes (can't see your sample, google can't resolve your domain), it's easy to keep them sorted along the perpendicular axis. For a list of planes [A B C D] the order-to-draw will be either [A B C D] or [D C B A] and nothing else! So there need not be a performance hit from sorting. Just keep them in order as you go.

Answer 2

Let's say that you are using some transparent *.png image. Then this would help:

new THREE.MeshBasicMaterial( { side:THREE.BackSide,map:texture, depthWrite: false, depthTest: false });

Answer 3

Setting the depthWrite property to false solved my issue.

new THREE.MeshBasicMaterial({ 
    opacity: 0.25, 
    transparent: true, 
    side: THREE.DoubleSide, 
    depthWrite: false
});

Answer 4

This is not a bug, it's just how OpenGL (and, hence, WebGL) works. Transparent surfaces don't play well with the z-buffer, and as such must be manually sorted and rendered back-to-front. Three JS is attempting to do this for you (which is why the problem goes away when you set the X value > 0) but cannot robustly handle the case of intersecting geometry like you're showing.

I've explained the issue more in-depth in a different SO question, so you may want to reference that.

Answer 5

Try adding alphaTest: 0.5 to the material.

Answer 6

Setting Mesh renderOrder to solve my problem, below is my code, you can modify node.renderOrder value:

loader.load(model_url, (gltf)=>{
            let scene = gltf.scene

            scene.traverse((node)=>{

                if(node.isMesh){
                    node.material.transparent = true

                    if(node.name === 'car_windows'){
                        node.material.opacity = 0.4
                        node.material.side = 0
                        node.renderOrder = 110
                    }

                    if(node.name === 'car_body'){
                        node.material.opacity = 0.4
                        node.renderOrder = 100
                    }

                    if(node.name === 'car_seats'){
                        node.material.opacity = .5
                        node.renderOrder = 90
                    }

                    mesh_arr.push(node)
                    mesh_objs[node.name] = node
                }
            })
})