tailieunhanh - 3D Graphics with OpenGL ES and M3G- P5

3D Graphics with OpenGL ES and M3G- P5:Mobile phones are the new vehicle for bringing interactive graphics technologies to consumers. Graphics that in the 1980s was only seen in industrial flight simulators and at the turn of the millennium in desktop PCs and game consoles is now in the hands of billions of people. This book is about the technology underpinnings of mobile threedimensional graphics, the newest and most rapidly advancing area of computer graphics. | 24 INTRODUCTION CHAPTER 1 COLLADA COLLADA short for COLLAborative Design Activity 12 started as an open-source project led by Sony but is nowadays being developed and promoted by the Khronos Group. COLLADA is an interchange format for 3D content it is the glue which binds together digital content creation DCC tools and various intermediate processing tools to form a production pipeline. In other words COLLADA is a tool for content development not for content delivery the final applications are better served with more compact formats designed for their particular tasks. COLLADA can represent pretty much everything in a 3D scene that the content authoring tools can including geometry material and shading properties physics and animation just to name a few. It also has a mobile profile that corresponds to OpenGL ES and M3G enabling an easy mapping to the M3G binary file format. One of the latest additions is COLLADA FX which allows interchange of complex multi-pass shader effects. COLLADA FX allows encapsulation of multiple descriptions of an effect such as different levels of detail or different shading for daytime and nighttime versions. Exporters for COLLADA are currently available for all major 3D content creation tools such as Lightwave Blender Maya Softimage and 3ds Max. A stand-alone viewer is also available from Feeling Software. Adobe uses COLLADA as an import format for editing 3D textures and it has been adopted as a data format for Google Earth and Unreal Engine. For an in-depth coverage of COLLADA see the book by Arnaud and Barnes AB06 . 12 collada PARTI ANATOMY OF A GRAPHICS ENGINE This page intentionally left .