Origami Ship Reprise

This is a small variation on my original customizable Origami Ship. http://www.thingiverse.com/thing:753562 Travelling in Greece this year, I kept spotting the origami ship in gift shops in various forms and materials. However they looked slightly different. I realized that typically they had a quadrilateral side in place of two triangles. The revised design looks cleaner than the original I think. It is slower to render because calculating the 4th point in the quadrilateral requires iterati