Home Tab > Analyze Panel > Create 3D PDF Files 
Instructs TANK to create or update the 3D PDF files during an analysis run. When TANK creates the 3D PDF files, the software activates the Insert 2D Page and Insert 3D Page options on the Preview/Print pane of the Output Processor.
Select this option and create the 3D PDF files prior to generating your final reports. If you make modifications to the dimensions of your tank after creating the 3D PDF files, select this option prior to reanalyzing the tank to update your 3D PDF files. After selecting reports from the Report List, click Print to PDF on the Preview/Print pane of the Output Processor and select Insert 3D Page to include the 3D model in the output report PDF. You can also click Print to 3D PDF on the Preview/Print pane of the Input Processor to print the 3D model as a separate PDF file.
You must have Adobe Acrobat version 11 (or higher) to use the 3D PDF feature.