Most PDF viewers don't support the 3D models feature, and just show a static image (literally an embedded image; they don't look at the 3D data at all). I've u

Most PDF viewers don't support the 3D models feature, and just show a static image (literally an embedded image; they don't look at the 3D data at all). I've used it to make 3D diagrams for multivariable calculus, done with Asymptote (https://asymptote.sourceforge.io/ https://asymptote.sourceforge.io/).