# needDepthPrePass creates flickering in 8.6.2 **URL:** \ **Category:** Bugs\ **Created:** [May 14, 2025, 12:45pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421 "2025-05-14T12:45:17Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 14, 2025, 12:45pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/1 "2025-05-14T12:45:17Z")
There is a lot of flickering on the mesh, whenever “needDepthPrePass” is enabled. To test, drag [https://test-realtime.lindberg.com/Demo/Flicker.babylon](https://test-realtime.lindberg.com/Demo/Flicker.babylon) into these sandboxes: 8.6.1 - No flicker: [Babylon.js Sandbox - View glTF, glb, obj and babylon files](https://sandbox.babylonjs.com/?version=8.6.1) 8.6.2 - Flickering: [Babylon.js Sandbox - View glTF, glb, obj and babylon files](https://sandbox.babylonjs.com/?version=8.6.2) I can’t reproduce in playground right now, but I’ll continue trying ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [May 14, 2025, 3:00pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/2 "2025-05-14T15:00:11Z")
I don’t see any flickering in 8.6.2 with this model (tested in Chrome, Edge and Firefox, Windows 11)? Try closing/restarting your browser, sometimes strange things happen… ---
**Author:** ![AlitarSemiramis](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/alitarsemiramis/32/49920_2.png) [@AlitarSemiramis](https://forum.babylonjs.com/u/AlitarSemiramis)\ **Post date:** [May 14, 2025, 4:18pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/3 "2025-05-14T16:18:37Z")
I also tried in Windows 11, with Edge, and no flickering on my end either. ---
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 16, 2025, 6:44am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/4 "2025-05-16T06:44:32Z")
Just tested Windows 11 and so there was no flickering for me either, but i can still reproduce in both Safari and Chrome on macOS ---
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 16, 2025, 9:10am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/5 "2025-05-16T09:10:41Z")
Finally able to reproduce in a PG: > **[Babylon.js Playground](https://playground.babylonjs.com/#RNWZOX)** > > Babylon.js playground is a live editor for Babylon.js WebGL and WebGPU 3D scenes Also confirmed on a co-workers mac For some wierd reason this only happens: - on macOS (Safari and Chrome) - when scene.useRightHandedSystem == true - when material.needDepthPrePass == true - when mesh.position != new Vector3(0, 0, 0) 8.6.1 - No flicker: [Babylon.js Playground](https://playground.babylonjs.com/?version=8.6.1#RNWZOX) 8.6.2 - Flickering: [Babylon.js Playground](https://playground.babylonjs.com/?version=8.6.2#RNWZOX) ---
**Author:** ![docEdub](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/docedub/32/14525_2.png) [@docEdub](https://forum.babylonjs.com/u/docEdub)\ **Post date:** [May 16, 2025, 4:49pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/6 "2025-05-16T16:49:11Z")
I don’t see any flickering on my MacBook Air M3. macOS 15.4.1 Safari 18.4 Chrome 136.0.7103.93 (arm64) ---
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 19, 2025, 9:59am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/7 "2025-05-19T09:59:31Z")
Interesting - I’m also on : 15.4.1, 18.4 and 136.0.7103.114 I can also reproduce on iOS 18.4.1 ---
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 21, 2025, 7:29am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/8 "2025-05-21T07:29:16Z")
Did you try zooming in, like in the videos? I have reproduced it on my iPhone and 3 different Macs now ---
**Author:** ![roland](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/roland/32/38940_2.png) [@roland](https://forum.babylonjs.com/u/roland)\ **Post date:** [May 21, 2025, 8:41am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/9 "2025-05-21T08:41:18Z")
I can repro on M4/Chrome Version 136.0.7103.114 (Official Build) (arm64)/BJS 8.8.5 Only WebGL is affected. ---
**Author:** ![roland](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/roland/32/38940_2.png) [@roland](https://forum.babylonjs.com/u/roland)\ **Post date:** [May 21, 2025, 8:43am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/10 "2025-05-21T08:43:14Z")
BJS 7.54.2 works fine. Safari, like Chrome, has issues as well with the newest BJS version. ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [May 21, 2025, 12:24pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/11 "2025-05-21T12:24:15Z")
---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [May 21, 2025, 1:34pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/12 "2025-05-21T13:34:35Z")
Can you check that this PG works for you? > **[Babylon.js Playground](https://playground.babylonjs.com/#RNWZOX%2348)** > > Babylon.js playground is a live editor for Babylon.js WebGL and WebGPU 3D scenes It works for me on my iPhone SE, unlike [https://playground.babylonjs.com/#RNWZOX#44](https://playground.babylonjs.com/#RNWZOX#44). I will create a PR if that is ok. ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [May 21, 2025, 1:34pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/13 "2025-05-21T13:34:39Z")
---
**Author:** ![roland](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/roland/32/38940_2.png) [@roland](https://forum.babylonjs.com/u/roland)\ **Post date:** [May 21, 2025, 1:56pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/14 "2025-05-21T13:56:38Z")
> [@Evgeni\_Popov](#): > > Can you check that this PG works for you? Works for me 😉 Tested both in Chrome and Safari. ---
**Author:** ![roland](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/roland/32/38940_2.png) [@roland](https://forum.babylonjs.com/u/roland)\ **Post date:** [May 21, 2025, 2:00pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/15 "2025-05-21T14:00:17Z")
@Evgeni_Popov Wait, wait! Something strange just happened. I tried opening the PG a second time, and it started flickering again… What the heck? Let me dig into this. **EDIT – Summary:** **Chrome and Brave:** 1. The first run works fine. 2. Refreshing the PG causes flickering to start again. 3. I need to quit the browser(s) and restart them to display the mesh without flickering. Closing the tab doesn’t do the job. **Safari:** Works fine, even with multiple refreshes. Quite interesting… ---
**Author:** ![docEdub](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/docedub/32/14525_2.png) [@docEdub](https://forum.babylonjs.com/u/docEdub)\ **Post date:** [May 21, 2025, 3:29pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/16 "2025-05-21T15:29:54Z")
Ah! I didn’t realize zooming in would repro this. I see the flickering on my mac now, too, when zooming in. ---
**Author:** ![Boye](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/boye/32/27574_2.png) [@Boye](https://forum.babylonjs.com/u/Boye)\ **Post date:** [May 26, 2025, 7:54am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/17 "2025-05-26T07:54:48Z")
> [@roland](#): > > Wait, wait! Something strange just happened. I tried opening the PG a second time, and it started flickering again… What the heck? Let me dig into this. Same for me - Fixed in Safari and the first time i launch it in Chrome, but it happens afterwards in Chrome ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [May 26, 2025, 9:11am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/18 "2025-05-26T09:11:19Z")
Very strange… At least it improves things overall, so here’s the PR: [https://github.com/BabylonJS/Babylon.js/pull/16668](https://github.com/BabylonJS/Babylon.js/pull/16668) ---
**Author:** ![roland](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/roland/32/38940_2.png) [@roland](https://forum.babylonjs.com/u/roland)\ **Post date:** [May 26, 2025, 10:36am UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/19 "2025-05-26T10:36:00Z")
shader voodoo 😃 ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [May 26, 2025, 9:18pm UTC](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421/20 "2025-05-26T21:18:33Z")
The fix is scary AF 🙂 Can you open a bug on webkit to be sure it gets handled one day ? [Next page](https://forum.babylonjs.com/t/needdepthprepass-creates-flickering-in-8-6-2/58421.md?page=2)