The current code doesn't build because of this part (with a / b = …).

  if(M === undefined || M === null) {
      // TODO verify this is correct; check for divide by 0 case?
      // SUPER TODO this is wrong; fix the tan inverse function and calculate the right brightness! that'll lead you to the correct C
      a / b = tan(h)
      M = a / Math.cos(Math.atan2(b,a));
  }

Is there something we can do to help you finish this module?

Right now declaring colors per cam16slice.html works as expected, however interpolation has chromatic inconsistencies for some but not all of the cases. I haven't been able to root cause the concern yet, but the current behavior is a release blocker. I'll track any discoveries in this issue.