Align Technology interview questions

It was a meeting in an office. First part was about presenting the company, role, expectations. They asked typical interview questions, nothing unusual. Second part was about checking my spacemouse skills to see if I'm able to work as a CAD designer.

First of all, there was a phone interview with an HR manager. It was more about common qualifications, career pursuits and so on. Then there was a phone interview with a team leader containing a couple of C++ oriented questions and several 3D-math ones. During the onsite interview, there were supposed to be people from various teams, so I could find a better fit, but it all came down to one team (the one from the phone interview), a couple of easy programming questions and some kind of a linear algebra and calculus exam. At last, the hiring manager came in, we've chatted a little bit, and I went home. I wasn't really satisfied with the interview process (didn't like the phone interview quality and math exam at the coding interview) and the environments of the company, therefore I rejected the offer.