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14<TITLE>OGRE Manual v1.0.7: The Core Objects</TITLE>
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37<H1> 2. The Core Objects </H1>
38<!--docid::SEC4::-->
39<A NAME="SEC5"></A>
40<H2> Introduction  </H2>
41<!--docid::SEC5::-->
42<P>
43
44This tutorial gives you a quick summary of the core objects that you will use in OGRE and what they are used for.
45</P><P>
46
47<A NAME="SEC6"></A>
48<H2> A Word About Namespaces </H2>
49<!--docid::SEC6::-->
50<P>
51
52OGRE uses a C++ feature called namespaces. This lets you put classes, enums, structures, anything really within a 'namespace' scope which is an easy way to prevent name clashes, i.e. situations where you have 2 things called the same thing. Since OGRE is designed to be used inside other applications, I wanted to be sure that name clashes would not be a problem. Some people prefix their classes/types with a short code because some compilers don't support namespaces, but I chose to use them because they are the 'right' way to do it. Sorry if you have a non-compliant compiler, but hey, the C++ standard has been defined for years, so compiler writers really have no excuse anymore. If your compiler doesn't support namespaces then it's probably because it's sh*t - get a better one. ;)
53</P><P>
54
55This means every class, type etc should be prefixed with 'Ogre::', e.g. 'Ogre::Camera', 'Ogre::Vector3' etc which means if elsewhere in your application you have used a Vector3 type you won't get name clashes. To avoid lots of extra typing you can add a 'using namespace Ogre;' statement to your code which means you don't have to type the 'Ogre::' prefix unless there is ambiguity (in the situation where you have another definition with the same name).
56</P><P>
57
58<A NAME="SEC7"></A>
59<H2> UML Diagram </H2>
60<!--docid::SEC7::-->
61<P>
62
63Shown below is a UML diagram of the core objects and how they relate to each other. Even if you don't know UML I'm sure you can work out the gist...
64</P><P>
65
66<CENTER><IMG SRC="images/uml-overview.png" ALT="images/uml-overview"></CENTER>
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68
69More details on these objects can be found in the following sections.
70</P><P>
71
72<A NAME="The Root Object"></A>
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