Have you ever noticed that in Three.js / WebGL, when you have two planes and one or both are transparent, the plane behind can be hidden by the transparent plane on top? Why does this happen?
Have you ever noticed that in Three.js / WebGL, when you have two planes and one or both are transparent, the plane behind can be hidden by the transparent plane on top? Why does this happen?
My problem was resolved by setting the depthWrite attribute to false.
Creating a new THREE.MeshBasicMaterial with the following properties:
opacity: 0.25,
transparent: true,
side: THREE.DoubleSide,
depthWrite: false
Imagine you have a partially transparent image in *.png format. In this case, you can make use of the following code snippet:
const material = new THREE.MeshBasicMaterial({
depthWrite: false,
depthTest: false,
side: THREE.DoubleSide,
map: texture
});
One potential solution could be to include alphaTest: 0.5 in the material settings.
The behavior you are experiencing is not a bug, but rather a result of how OpenGL (and consequently WebGL) functions. Transparent surfaces do not interact well with the z-buffer, requiring manual sorting and rendering in a back-to-front sequence. While Three JS tries to handle this automatically (which explains why the issue disappears with X value > 0), it struggles to manage intersecting geometries like the ones in your case.
For a more detailed explanation, you can refer to a related discussion on a different SO thread.
Just a heads up, if you have numerous parallel planes (unfortunately, I can't view your sample as Google is unable to resolve your domain), it is simple to maintain their order along the perpendicular axis. When dealing with a series of planes [A B C D], they will either be drawn in the order [A B C D] or [D C B A], and no other sequence! This means there is no need to worry about any performance issues from sorting. Just ensure they remain in the correct order as you progress.
Using Mesh renderOrder to resolve the issue at hand, the following snippet shows my implementation. Feel free to adjust the value of node.renderOrder:
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
}
})
})
I found success with this method; instead of using the value true for transparency, I recommend using the number 1.
object3d.material.transparent = 1;
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