Panda3D

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Panda3D
Stable release 1.6.2 / May 14, 2009
Preview release 1.7.0
Written in C++
Operating system Microsoft Windows, Linux, Mac OS X, FreeBSD
Type Game Engine
License Revised BSD (Panda3D License for versions before May 28, 2008)
Website http://panda3d.org/

Panda3D is a game engine which includes graphics, audio, I/O, collision detection, and other abilities relevant to the creation of 3D games.[1]

Panda3D is open source and, as of May 28, 2008, free software under the revised BSD license. Releases prior to May 28, 2008 are not considered Free Software due to certain errors in the design of the old Panda3D license. Despite this, these older releases of Panda3D can also be used for both free and commercial game development at no financial cost.

Panda3D's intended game-development language is Python. The engine itself is written in C++, and utilizes an automatic wrapper-generator to expose the complete functionality of the engine in a Python interface. This approach gives a developer the advantages of Python development, such as rapid development and advanced memory management, but keeps the performance of a compiled language in the engine core. For instance, the engine is integrated with Python's garbage collector, and engine structures are automatically managed.

The manual and the sample programs use Python, although the developers are working on translating the manual to C++ and providing C++ sample programs.

A developer using Panda3D typically writes code in Python, but it is also possible to directly access the engine using C++ code.

The users of Panda3D include the developers of several large commercial games, a few open source projects, and a number of university courses that leverage Panda3D's short learning curve. The community is small but active, questions on the forum are generally answered quickly.

Contents

Design

Panda3D is a scene graph engine.[2] This means that the virtual world is initially an empty Cartesian space into which the game programmer inserts 3D models. Panda3D does not distinguish between "large" 3D models, such as the model of an entire dungeon or island, and "small" 3D models, such as a model of a table or a sword. Both large and small models are created using a standard modeling program such as Blender, 3ds Max or Maya, loaded into Panda3D, and then inserted into the Cartesian space.

The Panda3D scene graph exposes the functionality of OpenGL and DirectX in a fairly literal form. For instance, OpenGL and DirectX both have fog capabilities. To enable fog in Panda3D, one simply stores the fog parameters on a node in the scene graph. The fog parameters exactly match the parameters of the equivalent calls in the underlying APIs. In this way, Panda3D can be seen as a thin wrapper around the lower-level APIs. Where it differs from them is that it stores the scene, whereas OpenGL and DirectX do not. Of course, it also provides higher-level operators, such as loading models, executing animations, detecting collisions, and the like.

Panda3D was first engineered before the existence of vertex and pixel shaders. It acquired support for manually-written shaders in 2005. However, users have been slow to leverage modern per-pixel lighting techniques in their games. The developers theorize that this is because shader programming can be quite difficult, and that many game developers want the engine to handle it automatically.[citation needed]

To remedy this situation, the Panda3D developers have recently given Panda3D the ability to synthesize shaders automatically. This synthesis occurs if the 3D modeler marks a model for per-pixel lighting, or if the modeler applies a normal map, gloss map, self-illumination map, or other capability that exceeds the capabilities of the fixed-function pipeline.[3] The intent of the synthesis is to render the model as the modeler intended, without any intervention from the programmer.

Non-Graphical Capabilities

Panda3D provides capabilities other than 3D rendering. Chief among these are:

  • Performance analysis tools.
  • Scene graph exploration tools.
  • Debugging tools.
  • A complete art export/import pipeline.
  • 3D Audio, utilizing either FMOD, OpenAL or Miles Sound System.
  • Collision detection.
  • Physics system, and full integration for the Open Dynamics Engine.
  • Keyboard and Mouse support.
  • Support for unusual I/O devices.
  • Finite state machines.
  • GUI.
  • Networking

History

The Disney VR studio is a branch of Disney that was created to build 3D attractions for Disney theme parks. They built an attraction called "Aladdin's Magic Carpet," and the engine they created for that was eventually to become Panda3D. The engine in its current form bears little resemblance to those early years. Over time, Panda3D was used for additional VR rides at Disney theme parks, and was eventually used in the creation of Toontown, an online game set in a cartoon world, and later for the second MMORPG, Pirates of the Caribbean Online. [4]

In 2002, the engine was released as open source. According to the authors, this was so that they "could more easily work with universities on Virtual Reality research projects." [5] However, it took some time for Panda3D to take off as an open-source project. From the article:

The system, although quite usable by the team that developed it, was not quite "open source ready." There were several interested users, but building and installing the system was incredibly complex, and there was little in the way of documentation or sample code, so there was no significant open source community right away.

However, the open-sourcing of the engine allowed Carnegie Mellon's Entertainment Technology Center to join in the development of the engine. While Disney engineers continued to do the bulk of the development, the Carnegie-Mellon team built a role for itself polishing the engine for public consumption, writing documentation, and adding certain high-end features such as shaders.

Panda3D's name was once an acronym: "Platform Agnostic Networked Display Architecture."[6] However, since that phrase has largely lost its meaning, the word "Panda3D" is rarely thought of as an acronym any more.

Software License

In 2002, when the engine was open sourced, the goal of the developers was to create a Free Software license. However, the license had a few flaws that made it non-Free: it arguably required submitting changes to Panda.Project@Disney.com, and it explicitly prohibiting the export of the software to various nations against which the United States has trade embargos.

On Wednesday 28 May 2008, the trunk of Panda3D development switched to the BSD license. However, old releases still use the old license.[7]

Panda3D makes use of several third party libraries whose licenses are also not Free Software, including FMOD, Nvidia Cg, DirectX, and MFC.

Users

Here is a partial list of companies and commercial products that utilize Panda3D:

Here is an incomplete list of free software projects building on Panda3D:

References

  1. "Panda3D Manual". http://panda3d.org/wiki/index.php/Main_Page. 
  2. "Panda3D Manual Chapter: 'The Scene Graph'". http://panda3d.org/wiki/index.php/The_Scene_Graph. 
  3. "Panda3D Manual Chapter: 'The Shader Generator'". http://panda3d.org/wiki/index.php/The_Shader_Generator. 
  4. "Gamasutra Postmortem: Disney's Toontown (discusses history of Panda3D)". http://www.gamasutra.com/features/20040128/goslin_01.shtml. 
  5. "Proceedings, PyCon 2004: The Panda3D Engine - Python Scripting for Game and Simulation Development". http://www.etsimo.uniovi.es/python/pycon/dc2004/papers/29/. 
  6. "GameDev.net coverage of Game Developer's Conference, Austin, 2008". http://www.gamedev.net/reference/business/features/08AGDC1/page3.asp. 
  7. "Panda3D Manual Chapter: 'Introduction to Panda'". http://panda3d.org/wiki/index.php/Introduction_to_Panda. 

External links

it:Panda3D pl:Panda3D pt:Panda3D ru:Panda3D (графический движок)

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