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163 | 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 'dat.gui'
const scene1 = new THREE.Scene()
const scene2 = new THREE.Scene()
const axesHelper1 = new THREE.AxesHelper(5)
scene1.add(axesHelper1)
const axesHelper2 = new THREE.AxesHelper(5)
scene2.add(axesHelper2)
const camera = new THREE.PerspectiveCamera(
75,
window.innerWidth / window.innerHeight,
0.1,
1000
)
camera.position.set(0, -0.35, 0.2)
const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)
new OrbitControls(camera, renderer.domElement)
const planeGeometry1 = new THREE.PlaneGeometry(2, 25)
const planeGeometry2 = new THREE.PlaneGeometry(2, 25)
// const texture1 = new THREE.TextureLoader().load("img/grid.png")
// const texture2 = new THREE.TextureLoader().load("img/grid.png")
const mipmap = (size: number, color: string): HTMLCanvasElement => {
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 imageCanvas
}
const blankCanvas = document.createElement('canvas') as HTMLCanvasElement
blankCanvas.width = 128
blankCanvas.height = 128
const texture1 = new THREE.CanvasTexture(blankCanvas)
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 = texture1.clone()
texture2.minFilter = THREE.NearestFilter
texture2.magFilter = THREE.NearestFilter
const material1 = new THREE.MeshBasicMaterial({ map: texture1 })
const material2 = new THREE.MeshBasicMaterial({ map: texture2 })
const plane1 = new THREE.Mesh(planeGeometry1, material1)
const plane2 = new THREE.Mesh(planeGeometry2, material2)
scene1.add(plane1)
scene2.add(plane2)
window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight
camera.updateProjectionMatrix()
renderer.setSize(window.innerWidth, window.innerHeight)
render()
}
const 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(() => updateAnistropy())
textureFolder.open()
function updateAnistropy() {
// for Three r137 and earlier
// texture2.needsUpdate = true
// for Three r138 and later
material2.map = texture2.clone()
}
function updateMinFilter() {
// for Three r137 and earlier
// texture2.minFilter = Number(texture2.minFilter)
// texture2.needsUpdate = true
// for Three r138 and later
material2.map = texture2.clone()
}
function updateMagFilter() {
// for Three r137 and earlier
// texture2.magFilter = Number(texture2.magFilter)
// texture2.needsUpdate = true
// for Three r138 and later
material2.map = texture2.clone()
}
const stats = Stats()
document.body.appendChild(stats.dom)
function animate() {
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()
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