Fix rotation values in GaussianSplattingMesh to use negative values f…

[takeru]

…or ROT_2 and ROT_3 cases

I noticed that the appearance differs between ply and spz.
It seems that the rot (rotation) of ply needs to be adjusted.

Lego left=ply, right=spz

Before(differ):

https://sandbox.babylonjs.com/?version=8.3.1

After(same):
https://sandbox.babylonjs.com/?snapshot=refs/pull/16521/merge

Debug

• Before(differ): https://playground.babylonjs.com/?version=8.3.1#3QY4KP#6
• After(same): https://playground.babylonjs.com/?snapshot=refs/pull/16521/merge#3QY4KP#6

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
refs/pull/16521/merge

Test environment:
https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16521/merge/index.html

To test a playground add it to the URL, for example:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16521/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/16521/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/16521/merge
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To test the snapshot in the playground with a playground ID add it after the snapshot query string:

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[bjsplat]

Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16521/merge/testResults/webgpuplaywright/index.html

[bjsplat]

WebGL2 visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16521/merge/testResults/webgl2playwright/index.html

[sebavan]

Let s check with @CedricGuillemet but I am pretty sure I have seen PRs doing the opposite and it might depend on the file type ?

[CedricGuillemet]

Let s check with @CedricGuillemet but I am pretty sure I have seen PRs doing the opposite and it might depend on the file type ?

yes, it's a nightmare to fix for 1 file type and not break the others

[CedricGuillemet]

Good catch. Tested fine with .PLY.