# Material SideOrientation/Normal flipped during glb export **URL:** \ **Category:** Bugs\ **Created:** [March 21, 2019, 3:31pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046 "2019-03-21T15:31:28Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [March 21, 2019, 3:31pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/1 "2019-03-21T15:31:28Z")
Hello! I am importing an obj file into my scene. Then I am exporting it using GLTF2Export.GLBAsync. I am using a right-handed coordinate system. When I re-import the glb file I have the wrong sideOrientation on materials. Is it possibly an issue of converting between standard material and PBR material not taking into account the right handed coordinate system? When I switch to left handed it works fine. Best Regards, -Brian ---
**Author:** ![MZIskandar](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mziskandar/32/422_2.png) [@MZIskandar](https://forum.babylonjs.com/u/MZIskandar)\ **Post date:** [March 21, 2019, 3:37pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/2 "2019-03-21T15:37:05Z")
Try… var theMesh = scene.getMeshByID(“theMeshName”); theMesh.overrideMaterialSideOrientation = 1; ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [March 21, 2019, 3:42pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/3 "2019-03-21T15:42:39Z")
That would fix the issue but it seems like a band-aid? ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [March 21, 2019, 4:32pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/4 "2019-03-21T16:32:10Z")
This should work as we are taking the useRightHandedSystem in account in the exporter. Can you repro on the playground? Pinging @bghgary ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [March 21, 2019, 4:32pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/5 "2019-03-21T16:32:45Z")
Yeah, this sounds like a bug. A PG would be helpful. ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [March 21, 2019, 6:30pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/6 "2019-03-21T18:30:41Z")
I’m working on a playground. I got it to this point: [https://www.babylonjs-playground.com/#95MJI8#15](https://www.babylonjs-playground.com/#95MJI8#15) Unable to import exported glb at the moment. ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [March 21, 2019, 7:44pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/7 "2019-03-21T19:44:06Z")
Okay I can reproduce it now. Here you go: [https://www.babylonjs-playground.com/#95MJI8#22](https://www.babylonjs-playground.com/#95MJI8#22) When right handed the material orientation is wrong. ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [March 22, 2019, 12:26am UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/8 "2019-03-22T00:26:56Z")
@BrianW Thanks for the PG. Do you mind filing a GitHub issue? ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [March 22, 2019, 12:15pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/9 "2019-03-22T12:15:40Z")
Not at all. Here you go: > Thanks! ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [May 14, 2019, 6:45pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/10 "2019-05-14T18:45:02Z")
I’m having the same issue with another block. I believe it has something to do with multi-material. Also the difference in lighting between the direct import vs glb import is strange if anyone could explain it to me I would be very happy. [https://www.babylonjs-playground.com/index.html#95MJI8#32](https://www.babylonjs-playground.com/index.html#95MJI8#32) ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [May 14, 2019, 6:50pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/11 "2019-05-14T18:50:18Z")
pinging @bghgary ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [May 14, 2019, 7:53pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/12 "2019-05-14T19:53:46Z")
The root of the problem is that the babylon file is referencing a texture `https://dl.dropbox.com/s/oziv24ps27qhel2/basket_texture.jpg` that isn’t an image. The handling of this is wrong somewhere in the rendering/export for this edge case, but fixing the asset will probably make it work. ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [May 15, 2019, 12:37pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/13 "2019-05-15T12:37:58Z")
Replaced texture with base64 string. The issue seems to still be there… [https://www.babylonjs-playground.com/index.html#95MJI8#33](https://www.babylonjs-playground.com/index.html#95MJI8#33) ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [May 15, 2019, 6:06pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/14 "2019-05-15T18:06:25Z")
I was not adding in the multi-material + sub materials to the scene. This fixed the side-orientation issue. Texture doesn’t seem to import though. [https://www.babylonjs-playground.com/index.html#95MJI8#34](https://www.babylonjs-playground.com/index.html#95MJI8#34) ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [May 15, 2019, 10:54pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/15 "2019-05-15T22:54:30Z")
@bghgary should be able to answer soon (We have a busy week, sorry for the inconvenience ) ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [May 16, 2019, 11:42am UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/16 "2019-05-16T11:42:26Z")
No problem. Thanks for the help. ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [May 16, 2019, 5:27pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/17 "2019-05-16T17:27:08Z")
Looks like there is an issue with the exporting code. @BrianW Can you file an issue on GitHub? @Drigax Can you look at this? Something is wrong with the way the materials are being exported. I can show you offline. ---
**Author:** ![Drigax](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/drigax/32/16585_2.png) [@Drigax](https://forum.babylonjs.com/u/Drigax)\ **Post date:** [May 17, 2019, 11:41am UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/18 "2019-05-17T11:41:18Z")
Sure, I have about 2 weeks worth of backlog to get through before I can give this my full attention, but I’d greatly appreciate any analysis 🙂 ---
**Author:** ![BrianW](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@BrianW](https://forum.babylonjs.com/u/BrianW)\ **Post date:** [May 21, 2019, 2:50pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/19 "2019-05-21T14:50:56Z")
Heres the issue: > ---
**Author:** ![trevordev](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/trevordev/32/16_2.png) [@trevordev](https://forum.babylonjs.com/u/trevordev)\ **Post date:** [May 22, 2019, 5:12pm UTC](https://forum.babylonjs.com/t/material-sideorientation-normal-flipped-during-glb-export/2046/20 "2019-05-22T17:12:34Z")
Thanks for creating the issue, I’ll try to take a look at this today. Created a possible PR to fix this here: >