javascript - Can I hide faces of a mesh in three.js? - Stack Overflow

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I want to make parts of a mesh invisible at runtime. Can I set these parts invisible/transparent, e.g. by changing attributes of single faces? The mesh itself uses only one material.

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Exemplary illustration as the editor understands this question: Imagine a mesh (here with a geometry of 20 vertices) where each quad of four vertices builds up a Face4. Now, some parts of the mesh should be made invisible (here two faces are invisible).

I want to make parts of a mesh invisible at runtime. Can I set these parts invisible/transparent, e.g. by changing attributes of single faces? The mesh itself uses only one material.

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Exemplary illustration as the editor understands this question: Imagine a mesh (here with a geometry of 20 vertices) where each quad of four vertices builds up a Face4. Now, some parts of the mesh should be made invisible (here two faces are invisible).

• javascript
• three.js
• mesh

Share Improve this question Follow edited Oct 8, 2013 at 21:47 user128511 asked Jun 14, 2012 at 0:38 user1455053user1455053 15111 silver badge33 bronze badges 2

• Your question is not really clear. Are you trying to set faces' visibility as false (make them invisible)? – frank Commented Jun 14, 2012 at 11:30
• I edited this question in a way I am understanding it. Especially, because I am having this question also and don't want to create a duplicate. – Matthias Commented Aug 23, 2012 at 1:56

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1 Answer 1

Sorted by: Reset to default 24 +50

Note: This answer applies to legacy versions of three.js

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You can assign a different material to each face. Here is an example where the faces share a material, but some faces are transparent:

// geometry
var geometry = new THREE.BoxGeometry( 100, 100, 100, 4, 4, 4 );

// materials
materials = [
    new THREE.MeshLambertMaterial( { color: 0xffff00, side: THREE.DoubleSide } ),
    new THREE.MeshBasicMaterial( { transparent: true, opacity: 0 } )
];

// assign material to each face
for( var i = 0; i < geometry.faces.length; i++ ) {
    geometry.faces[ i ].materialIndex = THREE.Math.randInt( 0, 1 );
}
geometry.sortFacesByMaterialIndex(); // optional, to reduce draw calls

// mesh
mesh = new THREE.Mesh( geometry, materials );
scene.add( mesh );

three.js r.87

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