If you were a photographer, your camera angle, viewing height, lens focal length, lighting, framing and composition all work together to create great pictures. Constructing models may be easy, but establishing the right kind of perspective view can be tricky. Usually commercial software or games are produced for sale or to serve a commercial purpose.In recent years, SketchUp modeling has become the preferred digital tool for academic and professional design environments allowing students, architects, interior designers, planners, industrial designers and practically anyone involved with design to easily build, manipulate and view 3D digital mock-ups of their concepts. Even though, most trial software products are only time-limited some also have feature limitations. After that trial period (usually 15 to 90 days) the user can decide whether to buy the software or not. Trial software allows the user to evaluate the software for a limited amount of time. Demos are usually not time-limited (like Trial software) but the functionality is limited. In some cases, all the functionality is disabled until the license is purchased. Demoĭemo programs have a limited functionality for free, but charge for an advanced set of features or for the removal of advertisements from the program's interfaces. In some cases, ads may be show to the users. Basically, a product is offered Free to Play (Freemium) and the user can decide if he wants to pay the money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game. This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared.

Programs released under this license can be used at no cost for both personal and commercial purposes.

Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). Freeware programs can be downloaded used free of charge and without any time limitations.

Sketchup make 2013