Rice University (Texas, US) has a pretty image illustrating the process of making 2D nanoflakes, Caption: The image displays the exfoliation of hexagonal boron nitride into atomically thin nanosheets ...

Viewer for many 3D and 2D model formats: glTF, X3D, VRML, Collada, 3DS, MD3, Wavefront OBJ, STL, Spine JSON, sprite sheets in Cocos2D and Starling XML formats ...