3D PDF would be my suggestion
https://www.simlab-soft.com/technologies/simlab-3d-pdf.aspx
Its the easiest path to success without asking clients to download some additional app to view.
Simlab has a nice Composer integration too so baking textures and other 'effects' are possible for that wow factor.
Or you could go bespoke and try using threejs to build your own html viewer. Sam's PBR tool is worth exploring too.
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