threepipe/examples/hdr-to-exr/script.ts

import {_testFinish, downloadBlob, IAsset, ITexture, LoadingScreenPlugin, ThreeViewer} from 'threepipe'

const viewer = new ThreeViewer({canvas: document.getElementById('mcanvas') as HTMLCanvasElement})

async function init() {
    viewer.addPluginSync(LoadingScreenPlugin)

    // import a hdr file
    const dataTexture = await viewer.import<ITexture>('https://threejs.org/examples/textures/equirectangular/venice_sunset_1k.hdr')
    if (!dataTexture) {
        console.error('Unable to import texture')
        return
    }

    // export as exr
    const blob = await viewer.export(dataTexture, {exportExt: 'exr'})
    if (!blob || blob.ext !== 'exr') {
        console.error('Unable to export texture', blob)
        return
    }

    // load the exr as environment map
    const map = await viewer.setEnvironmentMap({
        path: 'file.exr',
        file: blob,
    } as IAsset)
    if (!map) {
        console.error('Unable to load exr')
        return
    }
    viewer.scene.background = map

    // add download button
    const downloadButton = document.createElement('button')
    downloadButton.innerText = 'Download .exr'
    downloadButton.style.position = 'absolute'
    downloadButton.style.bottom = '3rem'
    downloadButton.style.right = '3rem'
    downloadButton.style.zIndex = '10000'
    downloadButton.onclick = () => downloadBlob(blob, 'file.exr')
    document.body.appendChild(downloadButton)

}

init().finally(_testFinish)