Now I like the effect but the ‘solid’ part of the turtle is a bit transparent and I can see the “hidden” second mesh that’s supposed to be inside and thus invisible because I want the turtle to be opaque. What can I change so I can achieve this effect?
Try switching the inputs where the Transparent BSDF joins the Mix- Shader, or you might have to reverse the upper Color Ramp, don’t know at this point with nothing to play around with.
OK, all I have done is check the outer shell, and re-did the noodling so that the vanish effect removes the outer shell…It will still show the parts under it if you unhide them in the outliner…