This is a 2D optical 4th-order aspheric curve of the form Dx^4+x^2/(R+(R^2+x^2(k+1) )^.5) that I'm trying to sketch, then revolve:
y(x)= .0002629*x^4+x^2/(39.5194+(1561.78-27.7483*x^2)^.5) -11 <= x <= 11
and SW fails on it. Click on the green checkmark and it just disappears w/o a trace. Anyone know why? Is there a limit on the length of the equation or the number of of nested parentheses?