Creating see-through front walls in a 3D room using THREE.js

Question

Creating see-through front walls in a 3D room using THREE.js

I am aiming to create a 3D room using three.js. My goal is to have the walls facing the camera rotate while becoming transparent.

If you need an example, check out this link: http://jsfiddle.net/tp2f2oo4/

It appears that adding THREE.BackSide to the material might be the solution.

var material2 = new THREE.MeshPhongMaterial( {
    color: 0xffffff, 
    transparent: false,
    side: THREE.BackSide
} );

This method works well when the room is represented by a single THREE.BoxGeometry. However, in my scenario, each wall, ceiling, and floor are separate THREE.BoxGeometry objects. Is there a way to either hide them or prevent them from rendering when they are facing the camera?

javascript three.js

Answer 1

Answer №1

Are you looking to conceal a mesh under certain conditions? Utilizing the onBeforeRender() and onAfterRender() methods could be the solution you need.

// functions
var onBeforeRender = function() {

    var v = new THREE.Vector3();

    return function onBeforeRender( renderer, scene, camera, geometry, material, group ) {

        // Customize this based on your requirements.
        if ( v.subVectors( camera.position, this.position ).dot( this.userData.normal ) < 0 ) {

            geometry.setDrawRange( 0, 0 ); // Adjust visibility here instead of using visible = false

        }

    };

}();

var onAfterRender = function( renderer, scene, camera, geometry, material, group ) {

    geometry.setDrawRange( 0, Infinity );

};

// create mesh
mesh = new THREE.Mesh( geometry, material );
mesh.position.set( 0, 0, 10 );
mesh.rotation.set( 0, 0, 0 );
scene.add( mesh );
mesh.userData.normal = new THREE.Vector3( 0, 0, - 1 );
mesh.onBeforeRender = onBeforeRender;
mesh.onAfterRender = onAfterRender;

See it in action: http://jsfiddle.net/3qh815xa/

Using three.js version r.114

Answer 2

Are you looking to conceal a mesh under certain conditions? Utilizing the onBeforeRender() and onAfterRender() methods could be the solution you need.

// functions
var onBeforeRender = function() {

    var v = new THREE.Vector3();

    return function onBeforeRender( renderer, scene, camera, geometry, material, group ) {

        // Customize this based on your requirements.
        if ( v.subVectors( camera.position, this.position ).dot( this.userData.normal ) < 0 ) {

            geometry.setDrawRange( 0, 0 ); // Adjust visibility here instead of using visible = false

        }

    };

}();

var onAfterRender = function( renderer, scene, camera, geometry, material, group ) {

    geometry.setDrawRange( 0, Infinity );

};

// create mesh
mesh = new THREE.Mesh( geometry, material );
mesh.position.set( 0, 0, 10 );
mesh.rotation.set( 0, 0, 0 );
scene.add( mesh );
mesh.userData.normal = new THREE.Vector3( 0, 0, - 1 );
mesh.onBeforeRender = onBeforeRender;
mesh.onAfterRender = onAfterRender;

See it in action: http://jsfiddle.net/3qh815xa/

Using three.js version r.114

Answer 3

Answer №2

To determine which walls to hide, you can utilize ray-casting. The concept involves projecting a ray from your camera and adjusting the transparency of any walls it intersects.

For a basic example, refer to the updateWallTransparency_simple function in the code snippet below. This function shoots a ray from the center of the camera and modifies the transparency of the wall it hits.

In certain scenarios, such as navigating corners, you may encounter specific challenges. To address this, implement a secondary raycast with modified offsets to prevent hitting the same wall at a corner. You can find an illustration of this technique in the updateWallTransparency_corners function.

Remember that this is a simplified demonstration. If your walls have complex shapes, additional checks will be necessary to control which walls should remain visible. Additionally, tilting the camera excessively upwards might cause rear walls to disappear. There are several factors to consider when dealing with this problem, but these initial steps should set you on the right path.

// Your custom JavaScript code goes here
// Feel free to modify and enhance as needed

function customFunctionality() {
  // Add your unique logic here
  
}

// Consider integrating more features and functionalities as required

Answer 4

To determine which walls to hide, you can utilize ray-casting. The concept involves projecting a ray from your camera and adjusting the transparency of any walls it intersects.

For a basic example, refer to the updateWallTransparency_simple function in the code snippet below. This function shoots a ray from the center of the camera and modifies the transparency of the wall it hits.

In certain scenarios, such as navigating corners, you may encounter specific challenges. To address this, implement a secondary raycast with modified offsets to prevent hitting the same wall at a corner. You can find an illustration of this technique in the updateWallTransparency_corners function.

Remember that this is a simplified demonstration. If your walls have complex shapes, additional checks will be necessary to control which walls should remain visible. Additionally, tilting the camera excessively upwards might cause rear walls to disappear. There are several factors to consider when dealing with this problem, but these initial steps should set you on the right path.

// Your custom JavaScript code goes here
// Feel free to modify and enhance as needed

function customFunctionality() {
  // Add your unique logic here
  
}

// Consider integrating more features and functionalities as required

Creating see-through front walls in a 3D room using THREE.js

Answer №1

Answer №2

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