Why are Nuance, Nitro, XChange, Apple Preview PDF viewers missing 3D?

Why are Nuance, Nitro, XChange, Apple Preview PDF viewers missing 3D?

Most PDF viewers, editors and processors do not yet support 3D display, and will only show the 2D parts of the PDF. We recommend Adobe Reader to view 3D PDFs.

Update: 11 June 2018.

Nuance PDF Reader is no longer available (replaced by paid for Power PDF Advanced).
Nitro (Pro 11) does not yet support 3D PDFs
PDF-XChange Viewer is no longer available (replaced by paid for PDF-XChange Editor).
Apple Preview does not yet support 3D PDFs.

sodaPDF claims to support “3D viewing technology” but did not appear to support demo 3D PDFs from this or some other sites.