COLLADA gains momentum as standard for exchanging 3D models between content and game creation tools
Google Earth and Sketchup add to the list of supporting applications
22nd June, 2006 - San Francisco, California - The Khronos™ Group announced that new version of KML, the geographic markup language for Google Earth, supports the COLLADA digital asset exchange schema. COLLADA enables Google Earth to take advantage of 3D models with enhanced geometry and support for textures for greater realism. Simply create a 3D model in any popular digital content creation software such as Maya, SOFTIMAGE|XSI, 3ds Max, Blender or Sketchup, add in photorealistic textures, export the model in COLLADA 1.4 format, and then import or drag and drop them into Google Earth.
COLLADA is an open standard XML-based digital asset exchange schema designed to transport data between 3D content creation tools and applications. It is specifically designed to let different content tools operate together in the same workflow and create efficient production pipelines. For applications that take advantage of COLLADA technology, this means you can move content freely from one application, add in additional features in another (e.g. shaders, physics, polygon optimization), and then pass the COLLADA document on to the next in a tool chain sequence. COLLADA is primarily targeted for the exchange of assets in a game pipeline, but it can be used in any area of 3D content creation that requires an intermediate format and good tool interoperability. By enabling a better tool chain, more tools are available to content developers. This in turn makes it easier to create better content at lower cost.
Google Earth is the first mainstream real-time 3D application and it is driving a new way of using the Internet based on 3D visualization, community and geospatial location. In selecting COLLADA as the format for geometry and textures, Google Earth can now be populated with high quality 3D content from popular content creation tools. After only a few days since the KML 2.1 announcement the Google 3D Warehouse is already rich with textured COLLADA content from 3D modelers and game content creators. Look for models with textures which are marked as downloadable by Google Earth V4.
COLLADA supported in most popular 3D content creation tools
The COLLADA 1.4 schema is already supported in many popular 3D content creation applications as well as middleware and 3D applications. COLLADA 1.4 includes core features such as mesh geometry, skinning, morphing, animation and data validation as well as COLLADA FX for defining visual effects and COLLADA Physics for physics effects including rigid body dynamics, rag dolls, constraints and collision volumes.
SOFTIMAGE|XSI v.5.1 - SOFTIMAGE|XSI is advanced animated character production software for game titles. The built-in COLLADA exporter and importer in XSI allow you to exchange 3D data with any digital content creation tool that supports COLLADA 1.4 including support for COLLADA FX shaders.
Maya using the free ColladaMaya plug-in Maya is an integrated 3D modeling, animation, effects and rendering solution used by film and video artists, game developers, and visualization professionals. The open source COLLADA plug-in for Maya supports importing/exporting Maya scenes using COLLADA 1.4.
3ds Max using the free ColladaMax plug-in - 3ds Max is a leading application for 3D animation for game development, design visualization, visual effects, and education. The open source COLLADA importer and exporter plug-in for 3ds Max supports all COLLADA 1.4 core features (e.g. animation and skinning) and a subset of ColladaFX.
Blender using the free ColladaBlender plug-in - Blender is a popular open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. This COLLADA plugin for blender is a script to import from and export to the Collada 1.4 format.
Sketchup 5 (beta) - Sketchup is an easy-to-learn 3D modeling program whose few simple tools enable you to create 3D models with details and textures
FX Composer 2 (beta) - FX Composer 2 provides a state-of-the-art integrated development environment for shader authoring in Cg and HLSL through COLLADA FX. (Currently available only to PLAYSTATION 3 developers.)
Houdini 8.1 (beta) - Houdini is advanced 3D animation and special effects software for use in film. The new v8.1 adds COLLADA import.
3D applications and middleware
Google Earth 4 (beta) - Google Earth offers a virtual globe of the planet which users can populate with maps, overlays, and 3D models. The new v4 supports import of textured COLLADA 3D models.
Unreal Engine 3 - Unreal Engine 3 is a complete game development framework for next-generation consoles and PC’s, providing the core technologies, content creation tools, and support infrastructure required by game developers. It is using COLLADA to transport content between DCC tools and the game engine tools.
Kynapse 4 - Kynapse is a middleware solution for large scale A.I. behavior simulation that lets non player characters move around in any 3D dynamic world, communicate and cooperate. The new v4 supports COLLADA import.
Tool Developers can add COLLADA support to their applications
Implementing COLLADA support in a 3D modeling tool is a straight forward process and can be handled in one of several ways:
- Use the open source COLLADA-DOM to enable load, save and modification in place of the data. COLLADA DOM uses LibXML to parse the COLLADA documents. The XML parser is a plug-in to COLLADA DOM, so you can replace it with your favorite parser. FX Composer 2.0 and Google Earth are using COLLADA-DOM as a loader
- Use the open source FCOLLADA C++ library to create their own tools for import/export. FCOLLADA is used for the ColladaMax and ColladaMaya plug-ins.
- Parse the XML themselves or they can use an automatic API generation tool for the COLLADA schema, such as for C# in Visual Studio 2005. SOFTIMAGE|XSI and BlenderCollada directly parse the XML.
- Use the COLLADA RT sample code that reads in a COLLADA document via the COLLADA-DOM and converts the structures into a form that is easier to use for a rendering / game engine purposes. It includes static libraries so developers can use COLLADA RT as an import API.
Learning more about COLLADA
During SIGGRAPH ‘06, AK Peters will be releasing the first book about COLLADA: “COLLADA: Sailing the Gulf of 3D Digital Content Creation”. This book explains in detail how to use the COLLADA technology in a project utilizing 3D assets, and ultimately how to create an effective content creation pipeline for the most complex development. It was created as a guide to the COLLADA 1.4 specification with the goal of providing readers with all the information that will help them understand the concepts, learn how the technology is already implemented by various tools, and provide guidance for using COLLADA in their applications.
The COLLADA specification, documentation, and sample code is available on the Khronos.org website at http://www.khronos.org/collada.
More About COLLADA
COLLADA is an intermediate format whose primary goal is to simplify the workflow between the different tools and the game engine. As an intermediate format, a COLLADA file can be broken into pieces that can be individually processed by the best tool. For example one COLLADA document may only contain physics data. The shader data may be contained in another COLLADA document. COLLADA is designed so that data can be split the way the user needs it for its particular tool chain. The data is even organized in libraries of specific type to help with this process (ie: shader and physics data is not mixed in COLLADA so it is easy to separate). You can simply merge the shaders and the physics later on in your pipeline or in the final applications.
The Khronos Group is a member-funded industry consortium focused on the creation of open standards such as OpenKODE™, OpenGL® ES, OpenMAX™, OpenVG™, OpenSL ES™, OpenML™ and COLLADA™ to enable the authoring and acceleration of dynamic media on a wide variety of platforms and devices. All Khronos members are able to contribute to the development of Khronos specifications, are empowered to vote at various stages before public deployment, and are able to accelerate the delivery of their cutting-edge media platforms and applications through early access to specification drafts and conformance tests. Please go to www.khronos.org for more information.
Khronos, OpenVG, OpenMAX and OpenSL ES are trademarks of the Khronos Group Inc. COLLADA is a trademark of Sony Computer Entertainment Inc. used by permission by Khronos. Google Earth and Sketchup are registered trademarks of Google, Inc. Softimage is a registered trademark of Avid Technology, Inc. 3ds Max and Maya are registered trademarks of Autodesk, Inc. Houdini is a registered trademark of Side Effects Software. Unreal is a registered trademark of Epic Games. PlayStation is a registered trademark of Sony Computer Entertainment Inc. All other product names, trademarks, and/or company names are used solely for identification and belong to their respective owners.