Viewing 3D PDF files on a Mac can be a bit tricky if you're not using the right tools. Luckily, there are a few ways to easily view 3D PDFs on your Mac. The most common methods are using Adobe Reader or Preview, which are both free and easy to use. Here's how to do it:

1. Using Adobe Reader:

Adobe Reader is a popular PDF viewer that also supports 3D PDFs. If you don't have Adobe Reader installed on your Mac, you can download it for free from the Adobe website. Once you have it installed, simply open the 3D PDF file in Adobe Reader and you should be able to view and interact with the 3D content.

2. Using Preview:

If you prefer not to use Adobe Reader, you can also view 3D PDF files using the built-in Preview app on your Mac. To do this, simply right-click on the 3D PDF file and select 'Open With' and then choose 'Preview'. You should be able to view the 3D content within the Preview window.

3. Enabling 3D View:

If you're having trouble viewing the 3D content in either Adobe Reader or Preview, you may need to enable the 3D view. In Adobe Reader, you can do this by going to 'View' > 'Show/Hide' > 'Toolbar Items' > '3D & Multimedia' and then selecting '3D View'. In Preview, you can enable 3D view by going to 'View' > 'Show Markup Toolbar' and then clicking on the '3D' icon.

By following these simple steps, you can easily view 3D PDF files on your Mac without the need for any additional software. Whether you choose to use Adobe Reader or Preview, both options provide a hassle-free way to view and interact with 3D content within PDF files. Now you can easily view 3D models, product designs, and other 3D content without any hassle on your Mac.