You can rewrite this as a single expression, with $r_s$, $r_m$, and $r_l$ as rows of a matrix $M$. Then $v = M\Phi$, where $v = [S, M, L]$. Therefore, your output is Vec3, which can be plotted per the next slide.
You can rewrite this as a single expression, with $r_s$, $r_m$, and $r_l$ as rows of a matrix $M$. Then $v = M\Phi$, where $v = [S, M, L]$. Therefore, your output is Vec3, which can be plotted per the next slide.