Transform your scene into a stunning 3D texture using THREE.js's 3D Render Targets feature

Question

Transform your scene into a stunning 3D texture using THREE.js's 3D Render Targets feature

After exploring the THREE.js example available here, I am curious about how to avoid scenes rendered as textures from appearing 'flattened'. Essentially, I want to maintain the depth illusion within the scene when using a WebGLRenderTarget.

I have extensively searched for information on this issue, including in the THREE.js documentation, but have not come across any references to this specific functionality. It is possible that such a feature could strain the user's processor unnecessarily, except in certain unique circumstances. Could it be achievable in pure WebGL instead?

EDIT: To those who downvoted - what makes this question inadequate? I have put effort into researching this topic, but my lack of experience with WebGL may be causing me to struggle with articulating my inquiry effectively. How can I enhance my question?

javascript three.js webgl

Answer 1

Answer №1

In my opinion, screenspace projections would be more suitable in this scenario rather than UV projections. For instance, taking your television example into account, the screen would contain the UV points that undergo transformation as the camera is repositioned. What you need is something static, meaning regardless of how much you move, the same image remains in view. I'm uncertain about achieving this without shaders, but when it comes to fragment shaders, there's the option of utilizing gl_FragCoord.

Answer 2

In my opinion, screenspace projections would be more suitable in this scenario rather than UV projections. For instance, taking your television example into account, the screen would contain the UV points that undergo transformation as the camera is repositioned. What you need is something static, meaning regardless of how much you move, the same image remains in view. I'm uncertain about achieving this without shaders, but when it comes to fragment shaders, there's the option of utilizing gl_FragCoord.

Answer 3

Answer №2

When rendering a scene with THREE.js, it "flattens" the objects to maintain the illusion of depth in render targets by changing the perspective relative to the main camera of the main scene. Below is a basic outline of how this can be achieved:

var scene = new THREE.Scene(),
    rtScene = new THREE.Scene(),
    camera = new THREE.PerspectiveCamera( ..... ),
    rtCamera = new THREE.PerspectiveCamera( ..... ),
    rtCube = new THREE.Mesh(new THREE.CubeGeometry(1,1,1), new THREE.MeshSimpleMaterial({ color: 0x0000ff }),
    rtTexture = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, { minFilter: THREE.LinearFilter, magFilter: THREE.NearestFilter, format: THREE.RGBFormat }),
    material = new THREE.MeshBasicMaterial({ map: rtTexture }),
    cube = new THREE.Mesh(new THREE.CubeGeometry(1,1,1), material);

function init() {
  //manipulate cameras
  //add any textures, lighting, etc

  rtScene.add( rtCube );
  scene.add( cube );
}

function update() {
   //some function of cube.rotation & cube.position
   //that changes the rtCamera rotation & position,
   //depending on the desired effect.
}

function animate() {
  requestAnimationFrame( animate );
  render();
}

function render() {
  renderer.clear();
  update();
  renderer.render( rtScene, rtCamera, rtTexture, true );
  renderer.render( scene, camera );
}

init();
animate();

The code assumes that the main camera remains fixed while the cube rotates around the y-axis. Each face has its own updating instance of material. The update() function involves trigonometric calculations based on the law of cosines. A jsFiddle example will be provided once my local setup is working correctly.

Answer 4

When rendering a scene with THREE.js, it "flattens" the objects to maintain the illusion of depth in render targets by changing the perspective relative to the main camera of the main scene. Below is a basic outline of how this can be achieved:

var scene = new THREE.Scene(),
    rtScene = new THREE.Scene(),
    camera = new THREE.PerspectiveCamera( ..... ),
    rtCamera = new THREE.PerspectiveCamera( ..... ),
    rtCube = new THREE.Mesh(new THREE.CubeGeometry(1,1,1), new THREE.MeshSimpleMaterial({ color: 0x0000ff }),
    rtTexture = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, { minFilter: THREE.LinearFilter, magFilter: THREE.NearestFilter, format: THREE.RGBFormat }),
    material = new THREE.MeshBasicMaterial({ map: rtTexture }),
    cube = new THREE.Mesh(new THREE.CubeGeometry(1,1,1), material);

function init() {
  //manipulate cameras
  //add any textures, lighting, etc

  rtScene.add( rtCube );
  scene.add( cube );
}

function update() {
   //some function of cube.rotation & cube.position
   //that changes the rtCamera rotation & position,
   //depending on the desired effect.
}

function animate() {
  requestAnimationFrame( animate );
  render();
}

function render() {
  renderer.clear();
  update();
  renderer.render( rtScene, rtCamera, rtTexture, true );
  renderer.render( scene, camera );
}

init();
animate();

The code assumes that the main camera remains fixed while the cube rotates around the y-axis. Each face has its own updating instance of material. The update() function involves trigonometric calculations based on the law of cosines. A jsFiddle example will be provided once my local setup is working correctly.

Transform your scene into a stunning 3D texture using THREE.js's 3D Render Targets feature

Answer №1

Answer №2

Similar questions

Sluggish Bootstrap Carousel Requires Mouseover or Click to Start Sliding

Display the JSON boolean value on the webpage using Ajax and Jquery

Advanced filtering of arrays in JavaScript

Tips for successfully passing multiple variables to the onload function within an Angular ng-include

slow loading background slideshow in css

I encountered an ECONNREFUSED error while attempting to fetch data from a URL using NodeJS on my company-issued computer while connected to the company network. Strangely

What is the reason why Prettier does not automatically format code in Visual Studio Code?

Adjust the node's location in Cytoscape.js

The functionality of jQuery.hover with AJAX is malfunctioning

Open in a new tab for enhanced content formatting in Prismic on NextJs

The route is redirecting to an incorrect destination

What is the best way to trigger a function after the v-model has been updated

Typescript is throwing a fit over namespaces

I am looking to include query string variables within JSON key-value pairs

Creating a Node.js application using Express requires careful consideration of file structure and communication methods

How come the useState function remains undefined, even when initialized with a default value?

What is the best way to efficiently input identical data into multiple controllers ($scope) using just one call in AngularJS?

Instructions on including a directory in the package.json file for publication on npm

The path NPM Package is missing in the package export

What methods can I use to identify if the browser my users are using does not have support for Bootstrap 4?