Construct is an HTML5-based 2D game editor, developed by Scirra Ltd. It is aimed primarily at non-programmers, allowing quick creation of games in a drag-and-drop fashion using a visual editor and a behavior-based logic system.
The primary method of programming games and applications in Construct is through ‘event sheets’, which are similar to source files used in programming languages. Each event sheet has a list of events, which contain conditional statements or triggers. Once these are met, actions or functions can be carried out. Event logic such as OR and AND, as well as sub-events (representing scope) allow for sophisticated systems to be programmed without learning a comparatively more difficult programming language.Groups can be used to enable and disable multiple events at once, and to organize events.
With an emphasis on portability, the engine targets the following APIs: Direct3D on Windows and Xbox 360; OpenGL on Mac, Linux, and Windows; OpenGL ES on Android and iOS; and proprietary APIs on video game consoles. Unity allows specification of texture compression and resolution settings for each platform that the game engine supports, and provides support for bump mapping, reflection mapping, parallax mapping, screen space ambient occlusion (SSAO), dynamic shadows using shadow maps, render-to-texture and full-screen post-processing effects. Unity’s graphics engine’s platform diversity can provide a shader with multiple variants and a declarative fallback specification, allowing Unity to detect the best variant for the current video hardware and, if none are compatible, to fall back to an alternative shader that may sacrifice features for performance.
Unity is notable for its ability to target games to multiple platforms. Within a project, developers have control over delivery to mobile devices, web browsers, desktops, and consoles. Supported platforms include Android, Apple TV, BlackBerry 10, iOS, Linux, Nintendo 3DS line, macOS, PlayStation 4, PlayStation Vita, Unity Web Player (including Facebook), Wii, Wii U, Windows Phone 8, Windows, Xbox 360, and Xbox One. It includes an asset server and Nvidia’s PhysX physics engine. Unity Web Player is a browser plugin that is supported in Windows and OS X only, which has been deprecated in favor of WebGL. Unity is the default software development kit (SDK) for Nintendo’s Wii U video game console platform, with a free copy included by Nintendo with each Wii U developer license. Unity Technologies calls this bundling of a third-party SDK an “industry first”