I'm having another issue with the cel shader.

Some of the models I use produce different results than other models. For example, look at the screenshot below. The purple blob thing has a much thinner cel-shaded line then the two women and the gun (you can barely see the gun, it's behind the purple blob). The red egg with feet and the tree have a weird effect going on. What am I doing incorrectly?

Excuse me once again if this is a newbish question!