Plug-ins and Applications > Developing Plug-ins and Applications > Creating 3D Annotations

Creating 3D Annotations
Three-dimensional annotations can be viewed in a PDF document by means of 3D annotations. This chapter explains how to create 3D annotations and modify existing ones by using Cos objects. Before you read this chapter, it is strongly recommended that you become familiar with Cos objects. (See Working with Cos Objects.)
The underlying 3D object data in a 3D annotation must conform to the Adobe PRC Format Specification or the Universal 3D (U3D) format developed by the 3D Industry Forum (http://www.3dif.org). Acrobat supports a subset of U3D, as described in the document U3D Elements, which can be found at the Acrobat Developer Center.
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