Strange Lines using Toon Materials

Hi, I constantly have the following issue when using VRay Toon materials with translucent or transparent materials within them. Unwanted diagonal lines are appearing in windows, but I otherwise like the toon style for some diagrammatic drawings. Is there a way to edit the glass or toon settings to resolve this?

You must set Line Width to 0

Unfortunately, if I do this, the toon effect is entirely removed.