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In computer-generated imagery and real-time 3D computer graphics, portal rendering is an algorithm for visibility determination. For example, consider a 3D computer game environment, which may contain many polygons, only a few of which may be visible on screen at a given time.
Panda3D is open source game engine and 3d rendering engine using Python and C++. Some features include physics, particle effects, GUI creation, AI, OpenGL/DirectX, render to texture and advanced shaders (normals, gloss, glow maps, HDR, cel shading).
Any 3D game engine can be used to create 2d games. Although using a 3d game engine to create a 2d game can often be excessive. If you are looking for recommended 2D game engines, see this post (Coming Soon.) Overview List: Recommended 3D Game Engines Here is the full list of game engines in this article: Unreal Engine 4 Unreal Engine 3 (UDK)
The use of portals simplifies the game engine 's task of determining visible areas and objects from any given point of view of the level, and simplifies rendering by allowing it to use each portal as a viewing frustum for the area it leads to.