I want to present some 3D models to my clients via email. I don't know what apps they have installed and I can't have then install any apps, most of them have a strict app policy.
What 3D formats does Preview for iOS support?
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You probably should look at what is listed here: QLPreviewController
Clipped from the developer site:
A Quick Look preview controller can display previews for the following items:
Microsoft Office documents (Office ‘97 and newer)
Rich Text Format (RTF) documents
Text files whose uniform type identifier (UTI) conforms to the public.text type (see Uniform Type Identifiers Reference)
Comma-separated value (csv) files
As far as I know, the only format that could embed 3D information in the format is the PDF file. But does QLPreviewController render it? I do not know.
Maybe an alternative for you would be to make a WebGL website that you link your customers to?