Anistropic Filtering
Video Lecture
Description
Anisotropic Filtering allows us to improve the quality of the MIP maps.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | // If using Relative Import References import * as THREE from '/build/three.module.js' import { OrbitControls } from '/jsm/controls/OrbitControls' import Stats from '/jsm/libs/stats.module' import { GUI } from '/jsm/libs/dat.gui.module' // If using Module Specifiers //import * as THREE from 'three' //import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls' //import Stats from 'three/examples/jsm/libs/stats.module' //import { GUI } from 'three/examples/jsm/libs/dat.gui.module' const scene1: THREE.Scene = new THREE.Scene() const scene2: THREE.Scene = new THREE.Scene() const axesHelper1 = new THREE.AxesHelper(5) scene1.add(axesHelper1) const axesHelper2 = new THREE.AxesHelper(5) scene2.add(axesHelper2) const camera: THREE.PerspectiveCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.01, 1000) const renderer: THREE.WebGLRenderer = new THREE.WebGLRenderer() renderer.setSize(window.innerWidth, window.innerHeight) document.body.appendChild(renderer.domElement) const controls = new OrbitControls(camera, renderer.domElement) controls.screenSpacePanning = true //so that panning up and down doesn't zoom in/out const planeGeometry1: THREE.PlaneGeometry = new THREE.PlaneGeometry(2, 25) const planeGeometry2: THREE.PlaneGeometry = new THREE.PlaneGeometry(2, 25) //const texture1 = new THREE.TextureLoader().load("img/grid.png") //const texture2 = new THREE.TextureLoader().load("img/grid.png") let mipmap = (size: number, color: string) => { const imageCanvas = document.createElement("canvas") as HTMLCanvasElement const context = imageCanvas.getContext("2d") as CanvasRenderingContext2D imageCanvas.width = size imageCanvas.height = size context.fillStyle = "#888888" context.fillRect(0, 0, size, size) context.fillStyle = color context.fillRect(0, 0, size / 2, size / 2) context.fillRect(size / 2, size / 2, size / 2, size / 2) return context.getImageData(0, 0, size, size) } const texture1 = new THREE.CanvasTexture(document.createElement("canvas")); texture1.mipmaps[0] = mipmap(128, '#ff0000'); texture1.mipmaps[1] = mipmap(64, '#00ff00'); texture1.mipmaps[2] = mipmap(32, '#0000ff'); texture1.mipmaps[3] = mipmap(16, '#880000'); texture1.mipmaps[4] = mipmap(8, '#008800'); texture1.mipmaps[5] = mipmap(4, '#000088'); texture1.mipmaps[6] = mipmap(2, '#008888'); texture1.mipmaps[7] = mipmap(1, '#880088'); texture1.repeat.set(5, 50); texture1.wrapS = THREE.RepeatWrapping; texture1.wrapT = THREE.RepeatWrapping; const texture2 = new THREE.CanvasTexture(document.createElement("canvas")); texture2.mipmaps[0] = mipmap(128, '#ff0000'); texture2.mipmaps[1] = mipmap(64, '#00ff00'); texture2.mipmaps[2] = mipmap(32, '#0000ff'); texture2.mipmaps[3] = mipmap(16, '#880000'); texture2.mipmaps[4] = mipmap(8, '#008800'); texture2.mipmaps[5] = mipmap(4, '#000088'); texture2.mipmaps[6] = mipmap(2, '#008888'); texture2.mipmaps[7] = mipmap(1, '#880088'); texture2.repeat.set(5, 50); texture2.wrapS = THREE.RepeatWrapping; texture2.wrapT = THREE.RepeatWrapping; const material1: THREE.MeshBasicMaterial = new THREE.MeshBasicMaterial({ map: texture1 }) const material2: THREE.MeshBasicMaterial = new THREE.MeshBasicMaterial({ map: texture2 }) texture2.minFilter = THREE.NearestFilter texture2.magFilter = THREE.NearestFilter const plane1: THREE.Mesh = new THREE.Mesh(planeGeometry1, material1) const plane2: THREE.Mesh = new THREE.Mesh(planeGeometry2, material2) scene1.add(plane1) scene2.add(plane2) camera.position.z = 1 window.addEventListener('resize', onWindowResize, false) function onWindowResize() { camera.aspect = window.innerWidth / window.innerHeight camera.updateProjectionMatrix() renderer.setSize(window.innerWidth, window.innerHeight) render() } var options = { minFilters: { "NearestFilter": THREE.NearestFilter, "NearestMipMapLinearFilter": THREE.NearestMipMapLinearFilter, "NearestMipMapNearestFilter": THREE.NearestMipMapNearestFilter, "LinearFilter ": THREE.LinearFilter, "LinearMipMapLinearFilter (Default)": THREE.LinearMipMapLinearFilter, "LinearMipmapNearestFilter": THREE.LinearMipmapNearestFilter }, magFilters: { "NearestFilter": THREE.NearestFilter, "LinearFilter (Default)": THREE.LinearFilter, } } const gui = new GUI() const textureFolder = gui.addFolder('THREE.Texture') textureFolder.add(texture2, 'minFilter', options.minFilters).onChange(() => updateMinFilter()) textureFolder.add(texture2, 'magFilter', options.magFilters).onChange(() => updateMagFilter()) textureFolder.add(texture2, 'anisotropy', 1, renderer.capabilities.getMaxAnisotropy()).onChange(() => texture2.needsUpdate = true) textureFolder.open() function updateMinFilter() { texture2.minFilter = Number(texture2.minFilter) texture2.needsUpdate = true } function updateMagFilter() { texture2.magFilter = Number(texture2.magFilter) texture2.needsUpdate = true } const stats = Stats() document.body.appendChild(stats.dom) var animate = function () { requestAnimationFrame(animate) render() stats.update() }; function render() { renderer.setScissorTest(true); renderer.setScissor(0, 0, window.innerWidth / 2 - 2, window.innerHeight); renderer.render(scene1, camera); renderer.setScissor(window.innerWidth / 2, 0, window.innerWidth / 2 - 2, window.innerHeight); renderer.render(scene2, camera); renderer.setScissorTest(false); } animate(); |