U3D


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U3D

(Universal 3D) A 3D graphics format developed by Intel and the 3D Industry Forum (3DIF) for sharing 3D drawings on the Web and in common office applications. In order to reduce the U3D file size for quick Internet downloading and fast rendering on screen, most of the engineering data associated with the original drawing is eliminated. U3D was not designed to offer another 3D file type for editing, but to create a simple format for interactive viewing that CAD programs can export to. In late 2004, Adobe announced support for U3D in Version 7 of its Acrobat/PDF product family.
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Before its final export to U3D, the graphics can be modified in Deep Exploration.
We embed the U3D file into a PDF document (details of this process are provided in section 3).
As it is very often necessary to display the coordinate system in mathematical graphics, we have prepared the procedure PlotAxes for plotting the axes in Maple in such a way that the export to VRML (and then to U3D) preserves them.
3 Embedding a U3D graphical object into a PDF document
The U3D graphical object we obtained can be embedded into a PDF document either by means of the commercial product Adobe Acrobat3D (http://www.adobe.com/products/acrobat3d/) or we can use the typesetting system [T.sub.E]X and the movie15 package ([2]).
Our experience shows that interactive graphics created in the Maple program can be relatively easily converted into the U3D format and embedded into PDF documents.
At present there is only one step of the process that requires commercial software for the conversion into U3D. Apart from the Deep Exploration program described in this paper it is also possible to use Acrobat 3D Toolkit for that conversion.
However, as this area is undergoing an intensive development we can hope that soon it will be possible to export 3D objects from Maple into U3D either directly or with the JavaView program (7).
Una de las principales ventajas del U3D es la posibilidad de analizar sectores o volumenes en cualquiera de los tres planos ortogonales, pudiendo para ello realizar cortes a lo largo de algunos de los ejes (x,y,z) y asi poder "mirar dentro" cualquier punto en particular (22).
El U3D se rige por los mismos principios basicos de la tecnica U2D y comparte sus mismas limitaciones fisicas, como la imposibilidad de una adecuada visualizacion de las estructuras estudiadas por aumento del paniculo adiposo materno, oligohidramnios, ciertas posiciones fetales y en ocasiones su movilidad intensa.
Otras limitantes importantes de la U3D son los altos costos de los equipos, la necesidad de un proceso de entrenamiento y una curva de aprendizaje del especialista, lo cual restringe la accesibilidad para un uso masivo de la tecnica entre las pacientes y en el momento de realizar trabajos de investigacion.
Es innegable que la U3D ha ampliado nuestra vision respecto al feto, la mujer y sus patologias; sin duda el avance tecnologico permitira en pocos anos, utilizarse de forma rutinaria y mejorar sus aplicaciones.