Metadata about the 3D model including the URL are stored in a Post transaction on the DeSo blockchain and minted to create a Non Fungible Token which can be bought and sold like any other NFT.

This repo contains front and back end code which can be used separately or in combination as in the demo.

NPM Installation

npm install 3d-nft-viewer

Back End NodeJS Module

Class: NFTReader

Functionality

Checks to see if the 3D model is already downloaded to your server.
Retrieves the NFT post data from the deso blockchain chain.
Downloads the model assets from arweave and extracts them.
Finds the local path of the glb or gltf model file.
Returns the URL of the extracted 3D model which you can then use to load the model into the Front End viewer or any other 3d app or metaverse experience.

Express JS Example

In the example below nftPostHashHex is the token that identifies the individual NFT You will see this during the minting process and on any DeSo node that displays your NFT.

https://docs.deso.org/for-developers/backend/blockchain-data/basics/data-types#postentryresponse

var express = require('express');
var router = express.Router();
var D3DNFT = require('3d-nft-viewer');

router.post('/:nftPostHashHex', (req, res) => {

  const nftPostHashHex = req.params.nftPostHashHex;

  let nftReader = new D3DNFT.NFTReader({
      nodeEndpoint: 'https://node.deso.org/api/v0/',  // DeSo API Endpoint (any node can be used)
      readerPublicKey: '<Your DeSo Public Key>',
      modelStorageDir: 'public/models/' // public directory to serve the model files
  });

  nftReader.retrieveNFT(nftPostHashHex)
  .then((responseJson)=>{
    res.send(responseJson);
  }).catch((responseJson)=>{
    console.log(responseJson);
    console.log('retrieveNFT error');
    res.send(responseJson);
  });
});

module.exports = router;

Front End Three JS Plugin

Class: Viewer

Functionality

Searches the DOM for elements with the nft-viewer css class name. For best results we recommend this is the container for a preview image showing a rotating gif of the 3D model (this is created automatically during the minting process - see How To Mint)
Sends an API request to the back end to fetch the URL for the 3D model file, downloading it from remote storage if necessary
When the 3D model URL is returned, a link with text "Click to View in 3D" is appended along with a click event handler
On click of the link the ThreeJS code replaces the image in the container element with a CANVAS tag and initializes the Three JS interactive view.

Example Front End Page Structure

  <head>
    <title>3D NFT Viewer</title>
    <link rel='stylesheet' href='/css/styles.css' />
  </head>
  <body>
    <div class="container">
		<img class="nft-preview" src="https://images.deso.org/746201e0167a8176c3c0ca2b141b4ed2c92442a1d16a55ab999a558e8a831a28.gif"/>
	</div>
	<p class="nft-viewer" data-nft="0b88277db8b3ddac74537b3f5b10897865e0fea5edcc47c86547a36fd5cf6693">Loading...</p>

  <script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
    <script type="importmap">
      {
        "imports": {
          "three": "https://cdn.skypack.dev/three"
        }
      }
    </script>
    <script type="module">
      // Find the latest version by visiting https://cdn.skypack.dev/three.
      import * as THREE from 'three';


      import { OrbitControls } from 'https://unpkg.com/three@0.139.1/examples/jsm/controls/OrbitControls.js';
      import { GLTFLoader } from 'https://unpkg.com/three@0.139.1/examples/jsm/loaders/GLTFLoader.js';
      import { XRControllerModelFactory } from '/js/webxr/XRControllerModelFactory.js';

      import { VRButton } from '/js/D3D_VRButton.js';

      import { D3DNFTViewer } from '/js/3dviewer.js'

            //initialize NFT viewer front end
        let nftViewer = new D3DNFTViewer({
            three: THREE,
            GLTFLoader: GLTFLoader,
            OrbitControls: OrbitControls,
            XRControllerModelFactory: XRControllerModelFactory,
            VRButton: VRButton,
            ctrClass: 'nft-viewer', // class of div which has posthashhex attribute
            nftDataAttr: 'data-nft', // Name of attribute of of div.ctrClass which contains posthashhex
            nftsRoute: 'nfts', // Back end route to initialize NFTs
            modelsRoute: 'models', // Back end route to load models
            linkText: 'View in 3D',
            previewCtrCls: 'container', //container element in which to create the preview
            skyboxes: true
        });
        nftViewer.initNFTs();

   </script>
  </body>
</html>

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Package last updated on 29 Jun 2023

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