Why do objects display in a left-hand coordinate system about diligentengine

[TheMostDiligent]

Because Diligent uses a left-handed coordinate system.

[Haidiye00]

Diligent math library uses the right-handed coordinate system by default.
But rendering is a left-hand coordinate system， then How do I change the rendering to a right-hand coordinate system

[TheMostDiligent]

Please read this
If you want right-handed you need to apply a transform that changes handness, for example inverses x axis.

[Haidiye00]

The projection matrix in bgfx can support right-hand coordinate systems. Will DiligentEngine support it in the future

[TheMostDiligent]

This is the matter of changing the signs of a few members in a matrix.
You can trivially do it yourself if you need it.

[Haidiye00]

Can you help provide a demo? Thank you

[TheMostDiligent]

You likely need to swap X axis here:
https://github.com/DiligentGraphics/DiligentSamples/blob/7d4f4e14ea21aeb155dcd2d5ca2790c4e429fdb9/Samples/GLTFViewer/src/GLTFViewer.cpp#L121

And also change cull mode here:

https://github.com/DiligentGraphics/DiligentFX/blob/a0a5802d58b63ad158d68fb041f8d6a1b0a3ccdc/GLTF_PBR_Renderer/src/GLTF_PBR_Renderer.cpp#L253