Three.js Cookbook

Book Image

Three.js Cookbook

By : Jos Dirksen

Book Image

Three.js Cookbook

By: Jos Dirksen

Overview of this book

Three.js Cookbook

Three.js Cookbook

Credits

About the Author

About the Author

Acknowledgments

Acknowledgments

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Free Chapter

Getting Started

Getting Started

Getting started with the WebGL renderer

Getting started with the Canvas renderer

Getting started with the CSS 3D renderer

Detecting WebGL support

Setting up an animation loop

Determining the frame rate for your scene

Controlling the variables used in the scene

Setting up a local web server with Python

Setting up a local web server with Node.js

Setting up a local web server using Mongoose

Solving cross-origin-domain error messages in Chrome

Solving cross-origin-domain error messages in Firefox

Adding keyboard controls

Loading textures asynchronously

Loading models asynchronously

Loading models asynchronously with progress

Loading other resources asynchronously with progress

Waiting until resources are loaded

Dragging a file from the desktop to the scene

Geometries and Meshes

Geometries and Meshes

Rotating an object around its own axis

Rotating an object around a point in space

Informing Three.js about updates

Working with a large number of objects

Creating geometries from height maps

Pointing an object to another object

Writing text in 3D

Rendering 3D formulas as 3D geometries

Extending Three.js with a custom geometry object

Creating a spline curve between two points

Creating and exporting a model from Blender

Using OBJMTLLoader with multiple materials

Applying matrix transformations

Working with the Camera

Working with the Camera

Making the camera follow an object

Zooming the camera to an object

Using a perspective camera

Using an orthographic camera

Creating a 2D overlay

Rotating the camera around a scene

Matching the rendered view to a resized browser

Converting world coordinates to screen coordinates

Selecting an object in the scene

Materials and Textures

Materials and Textures

Adding depth to a mesh with a bump map

Adding depth to a mesh with a normal map

Using HTML canvas as a texture

Using HTML video as a texture

Creating a mesh with multiple materials

Using separate materials for faces

Setting up repeating textures

Making part of an object transparent

Using a cubemap to create reflective materials

Using a dynamic cubemap to create reflective materials

Using Blender to create custom UV mapping

Configuring blend modes

Using a shadow map for fixed shadows

Lights and Custom Shaders

Lights and Custom Shaders

Creating shadows with THREE.SpotLight

Creating shadows with THREE.DirectionalLight

Softening lights by adding ambient lighting

Using THREE.HemisphereLight for natural lighting

Adding a moving all-directional light

Moving a light source along a path

Making a light source follow an object

Creating a custom vertex shader

Creating a custom fragment shader

Point Clouds and Postprocessing

Point Clouds and Postprocessing

Creating a point cloud based on a geometry

Creating a point cloud from scratch

Coloring the individual points in a point cloud

Styling individual points

Moving individual points of a point cloud

Exploding a point cloud

Setting up the basic postprocessing pipeline

Creating custom postprocessing steps

Saving WebGL output to disk

Animation and Physics

Animation and Physics

Creating animations with Tween.js

Animating using morph targets

Animating with skeletons

Using morph animations created in Blender

Using skeleton animations created in Blender

Adding a simple collision detection

Saving a movie of an animation in Chrome

Dragging and dropping objects around a scene

Adding a physics engine

Index

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Rotating the camera around a scene

In Chapter 2, Geometries and Meshes, we already showed you a number of recipes that explained how to rotate objects. In this recipe, we'll show you how to rotate the camera around a scene while the camera will keep looking at the center of the scene.

Getting ready

For this recipe, we'll use the standard THREE.PerspectiveCamera object, which we rotate around a simple scene. To see the final result, open the 03.08-rotate-camera-around-scene-y-axis.html example in your browser.

On this web page, you can see that the camera rotates around the scene while the floor, box, and lights stay at the same position.

How to do it...

To accomplish this, we only need to perform a couple of very simple steps:

The first thing we need to do is create THREE.PerspectiveCamera and position it somewhere in the scene:

  // create a camera, which defines where we're looking at.
  camera = new THREE.PerspectiveCamera(45,window.innerWidth / window.innerHeight, 0.1, 1000);
  // position...