About this 3D model

I create an experimental contours based on marching squares. Here's a demonstration. You can find source code on dotSCAD/examples/image_slicer.scad, too. The source code requires OpenSCAD and dotSCAD. If you want to slice your selected picture, use img2gray to convert an image into gray scale data. Then, use the gray scale data to replace the `level` value.