Save 3D scene to PDF as unprotected

Hi,

When I save a 3D scene to a PDF with this code:

        PdfSaveOptions opt = new PdfSaveOptions();
        opt.LightingScheme = PdfLightingScheme.CAD;
        opt.RenderMode = PdfRenderMode.Solid;                        
        scene.Save(@"C:\temp\output3D.pdf", opt);

Then when I open this output 3D PDF with Adobe Acrobat Reader, I always get the ‘?’ as shown in the attachment. Is there a way to save 3D PDF which will immediately be opened without the ‘?’ ?

AdobeAcrobatReader.png (23.8 KB)

kind regards

@phapnguyen

It seems like a limitation of Adobe Reader. However, can you please provide the sample source file and output PDF so that we can further investigate the case?