Creating 3D geometries in webGL and p5.js is a powerful way to create interactive and visually interesting web applications. With the ability to create basic shapes, add textures, lighting, and materials, and transform 3D geometries, we can create a wide range of 3D graphics and animations. By understanding the basics of webGL and p5.js, we can create stunning 3D geometries for their web applications.
3D Shape Creation
The first step is to generate some 3D geometries using webGL and p5.js built-in functions. These shapes can be produced using the library's built-in methods, such as sphere(), box(), and cylinder() .
Use webGL
In webGL, the gl.drawArrays() function can be used to build basic shapes. This function has three input parameters, which are the basic primitive type, the starting index and the number of indexes to be displayed. For example, to create a sphere, we can use the gl.TRIANGLES primitive type and pass in the vertices and indices of the sphere.
Example
<!DOCTYPE html> <html> <head> <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/110/three.min.js"></script> </head> <body> <canvas id="canvas"></canvas> <script> // Set up the scene const scene = new THREE.Scene(); // Set up the camera const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 ); camera.position.z = 5; // Set up the renderer const renderer = new THREE.WebGLRenderer({ canvas: document.getElementById("canvas"), }); renderer.setSize(window.innerWidth, window.innerHeight); // Create the sphere const sphereGeometry = new THREE.SphereGeometry(1, 32, 32); const sphereMaterial = new THREE.MeshBasicMaterial({ color: 0xffff00 }); const sphere = new THREE.Mesh(sphereGeometry, sphereMaterial); scene.add(sphere); // Render the scene renderer.render(scene, camera); </script> </body> </html>
Using p5.js
The createShape() function in p5.js can be used to make simple shapes. The CreateShape() function takes a single parameter i.e., “the type of shape to be created”. To make a sphere, for example, we can use the createShape(SPHERE) method.
Example
<!DOCTYPE html> <html> <head> <title>3D Sphere Example</title> <script src="https://cdn.jsdelivr.net/npm/p5@1.1.9/lib/p5.min.js"></script> </head> <body> <script> function setup() { createCanvas(windowWidth, windowHeight, WEBGL); } function draw() { background(200); // Create the sphere push(); fill(255, 0, 0); sphere(150); pop(); } </script> </body> </html>
Adding Textures
After generating our 3D designs, we can add textures to make them more attractive. In webGL and p5.js, textures can be applied to shapes using the gl.texImage2D() and texture() APIs respectively.
Use webGL
The gl.texImage2D() function in webGL is used to generate a 2D texture from an image file. This function accepts lots of arguments, including the target, level of detail, internal format, image width and height, and image data format and type.
Example
<html> <head> <script src="https://cdn.jsdelivr.net/npm/three@0.115.0/build/three.min.js"></script> </head> <body> <script> // Set up the scene var scene = new THREE.Scene(); var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 ); var renderer = new THREE.WebGLRenderer(); renderer.setSize(window.innerWidth, window.innerHeight); document.body.appendChild(renderer.domElement); // Create a cube var geometry = new THREE.BoxGeometry(3, 3, 3); var texture = new THREE.TextureLoader().load("https://images.pexels.com/photos/1029604/pexels-photo-1029604.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1"); var material = new THREE.MeshBasicMaterial({ map: texture }); var cube = new THREE.Mesh(geometry, material); scene.add(cube); // Position the camera camera.position.z = 5; // Render the scene function render() { requestAnimationFrame(render); cube.rotation.x += 0.01; cube.rotation.y += 0.01; renderer.render(scene, camera); } render(); </script> </body> </html>
Using p5.js
In p5.js, the texture() function is used to apply texture to an object. The texture() function accepts one parameter: the texture image file.
Example
<html> <head> <title>p5.js Texture Example</title> <script src="https://cdn.jsdelivr.net/npm/p5"></script> <script src="https://cdn.jsdelivr.net/npm/p5/lib/addons/p5.dom.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/p5/lib/addons/p5.sound.min.js"></script> </head> <body> <script> let img; function preload() { img = loadImage("https://images.pexels.com/photos/1029604/pexels-photo-1029604.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1"); } function setup() { createCanvas(650, 300, WEBGL); noStroke(); } function draw() { background(200); texture(img); rotateX(frameCount * 0.01); rotateY(frameCount * 0.01); box(100); } </script> </body> </html>
We applied WebGL and p5.js to build 3D geometry and applied animation in our web apps. We discussed some basic concepts of creating 3D geometries in webGL and p5.js, including shapes, textures, lighting, and more.
The above is the detailed content of How to create 3D geometry in webGL and p5.js?. For more information, please follow other related articles on the PHP Chinese website!

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Dreamweaver CS6
Visual web development tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.