Fixed Shadows (#5166)
Fixed some minor regressions

🚀 v4.3.0
This release introduces multi-model scene support, texture updates, and critical compatibility patches for iOS WKWebViews and WebXR overlays.

🌟 Highlights
Multi-Model Support: Easily render multiple models in a single scene using < extra-model >.
Modern Formats: Added KTX2 texture API support, enabled KTX2 compressed scene exports, and migrated to HDRLoader.
iOS & WebXR Fixes: Resolved a critical WebGL memory leak on iOS, patched AR Quick Look transitions inside WKWebView-based browsers (Chrome, Google Search App), and fixed input target misalignment inside WebXR DOM Overlays.
three.js Compatibility: Renamed internal elements to ensure full compatibility with the upcoming three.js r183 release.

❤️ Contributors
A huge thank you to Douglas Holm, Vincent Fretin, Frank, and Salman Chishti for submitting features and bug fixes for this release!

Features

🆕 UI/UX updates to the XR mode, thanks @samaneh-kazemi!

Bug fixes

• Backwards animation works again, thanks @mohammadbaghaei! #5026

Other notable changes

• Upgraded to Three.js r182
• A lot of code maintenance, thanks @samaneh-kazemi, @mohammadbaghaei, @Frank3K!

Features

🆕 Added the ability to run and combine multiple animations simultaneously, thanks @mohammadbaghaei! #4979

Bug fixes

• For better AR support across different devices, moved the hit-test to optionalFeatures, thanks @mohammadbaghaei! #4960

Other notable changes

• Upgraded to Three.js r174, thanks @mohammadbaghaei!
• maxTextureSize parameter in the three.js parseAsync options for QuickLook can be set through model-viewer, thanks @mohammadbaghaei!

✋Breaking Change

• Our default tone-mapping has been updated to PBR Neutral, for improved color accuracy. If you have not been specifying tone-mapping, you'll need to either regenerate your poster images or use tone-mapping="aces" to get our legacy behavior. #4886
• The default min and max camera-orbit have been updated to allow straight top and bottom views. #4916

Bug fixes

• Fixed variants. #4882
• Fixed surface hotspot updates. #4867
• Fixed withCredentials updating. #4892
• getCameraTarget now returns the instantaneous position, like getCameraOrbit. #4895

Examples

✨ Updated model documentation. #4776
✨ Fixed material picking example to work in WebXR mode, thanks @Hamidrzash! #4851

Other notable changes

• Upgraded to Three.js r169. #4885, #4907
• We no longer require a meta viewport tag to render at full DPR resolution. #4896
• Moved the render fidelity comparisons out of this repo to Khronos ownership. #4779

Editor

• Fixed tone mapping drop-down, thanks @rsax! #4890

Features

🆕 Added localization API for a11y for WCAG compliance, thanks @cybmiper! #4715
🆕 Added Khronos PBR Neutral tone mapping standard ("neutral") - "commerce" is now an alias for this. #4716, #4760

Bug fixes

• Fixed USDZ auto-generation when changing baseColorFactor. #4690
• Fixed progress event reason propagation, thanks @rsleyland! #4701
• Fixed build problems related to imports, thanks @chamby! #4707, #4710
• Fixed DPR for iframes. #4723
• Fixed grounded skybox rotation. #4752
• Fixed USDZ rotation. #4753
• Fixed toBlob for offscreen elements. #4754
• Improved performance when model-viewer.js loads before a 3D element is visible, thanks @Arecsu! #4758

Examples

✨ Added example of a11y localization, thanks @cybmiper! #4715

Other notable changes

• Upgraded to Three.js r163. #4738, #4745
• Updated three-gpu-pathtracer comparisons, thanks @gkjohnson! #4686, #4696
• Added Blender Cycles to fidelity comparisons, thanks @vis-prime! #4492

Editor

• Removed some use of innerHTML (XSS security), thanks @Shivam7-1! #4748

Features

🆕 Added UltraHDR lighting support for 10x-30x smaller environments! #4578
🆕 Added skybox-height option to project an outdoor skybox onto the ground plane. #4604
🆕 Added AgX tone mapping and Commerce tone mapping is improved and no longer experimental! #4615
🆕 Added a reason property to the progress event, thanks @alexdaube! #4647

Bug fixes

• Improved AR button accessibility, thanks @Technickel-Dev! #4524
• Made CreateVideoTexture() respect with-credentials, thanks @navidadelpour! #4635

Examples

✨ Added example of toggling visibility of mesh variants. #4528
✨ Updated lighting examples for UltraHDR example. #4578
✨ Added Grounded Skybox example. #4604
✨ Added a tone mapping comparison example. #4615
✨ Small fixes for examples. #4514, #4627
✨ Added an FAQ on color accuracy, including links to longer write-ups on tone mapping and model validation. #4637

Other notable changes

• Upgraded to Three.js r160. #4610
• Added V-Ray support for emissive strength comparison, thanks @jasondavies! #4509
• Fixed Babylon transparency for fidelity comparisons, thanks @bghgary! #4531
• Switch from glTF-Sample-Models to the newer glTF-Sample-Assets, thanks @bhouston! #4534, #4546
• Add anisotropy tests to render-fidelity-tests (and update Babylon + Filament to latest), thanks @bhouston! #4535
• Update render fidelity main page to list renderers in a table, thanks @bhouston! #4539
• Enable complex arguments for "npm run render-goldens" command, thanks @bhouston! #4542
• Reduce time for fidelity test CI, thanks @bhouston! #4543
• Removed IE11-specific code, thanks @Frank3K! #4603
• Updated our commerce tone mapper for improved contrast and color accuracy. #4614

Editor

• Added open graph metadata to editor, thanks @Technickel-Dev! #4527
• Commerce tone mapping is now the editor default. #4615

Features

🆕 Added an experimental tone-mapping attribute to allow switching from our default, aces, to a new commerce function designed specifically for color accuracy in 3D commerce. #4495
🆕 Added zoom-sensitivity and pan-sensitivity attributes, thanks @nicolas-daures! #4412

Bug fixes

• Fixed sampler API that was leaking three.js internals. #4473, #4499, #4502
• Fixed variants normal map inversion. #4476
• Fixed glTF lights punctual support. #4477

Other notable changes

• Upgraded to Three.js r157. #4471, #4489
• Added V-Ray renders to fidelity comparisons, thanks @jasondavies and @bhouston! #4487

Editor

• Added a dropdown in the lighting tab to switch the tone mapping function. #4495

Bug fixes

• Fix npm postinstall script that was blocking install. #4359 #4363
• Fix not awaiting for QuickLook when activating AR in iOS, thanks @heatblayze! #4405

Other notable changes

• Removed Lerna in favor of npm workspaces. #4368 #4408

Features

🆕 Added optional post-processing API with a variety of rendering effects, thanks @Beilinson! #3948
🆕 Added an unbundled build, model-viewer-module.min.js, for use with post-processing or any others who need to de-duplicate three.js using import maps, thanks @Beilinson! #3948
🆕 Added anisotropy support. #4314, mrdoob/three.js#25580
🆕 Added PBR Next material extensions API, including anisotropy, clearcoat, ior, iridescence, sheen, specular, etc. #4319, #4330, #4348
🆕 Added texture transform API to Sampler: setRotation, setScale, and setOffset. #4209

Bug fixes

• Fix transmissive objects losing color. #4314, mrdoob/three.js#25819
• Fix webpack compilation warning, thanks @annahassel! #4350

Examples

✨ Added many post-processing examples, thanks @Beilinson! #3948
✨ Added transform textures example. #4209

Other notable changes

• Upgraded to Three.js r154
• Switched testing framework to modern-web and playwright. Also swapped jasmine for mocha in the space-opera tests. #4268
• Added postinstall script that updates the three importmap version, thanks @Beilinson! #4260