Restricting the noncompete to cover only a very narrow domain can work too. Depending on how specialized you are, that might not be enough, which is why I recommend conceding only term-of-employment.

Your example sounds perfectly fine! But if you've spent decades building "3D animation engines for games" at various companies that do so - and that's basically your career now - you won't be helped much by being specific about what type of work is considered competition. YMMV, so concede only in ways that leave your options open.