Android follows normal java package conventions plus here is an important snippet of text to read (this is important regarding the wide use of xml files while developing on android).he concept comes from Package Naming Conventions in Java, more about which can be read here:*. http://en.wikipedia.org/wiki/Java_package#Package_naming_conventions. Source: http://www.quora.com/Why-do-a-majority-of-Android-package-names-begin-with-com.
Files that contain the .3ds file extension are most commonly associated with the Autodesk 3D Studio software.he 3DS files that are used by the software contain a variety of information used to form a three dimensional scene, like coordinates, list of polygons used to form the objects, color information etc.
You only need to use any 3D modeling or CAD program to be precise, then most of these softwares can save or export your data into .stl file format which is the native file format for 3D printers.f you want to get started with a 3D modeling program you can pick up Blender which is a free and open source modeling program, http://www.blender.org/ . Be sure to check out the education section to find tutorials on how to use it.