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Delaunay三角形的网格剖分程序

<TITLE>COG 2.1: Startup File</TITLE>

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<H1>COG 2.1: Startup File</H1>

 <P>Let's start with the simplest 3D grid example - a cube,
consisting of six tetrahedra.  We need, of course, an include file:

<PRE>
#include "<A HREF="coglib.hxx">cog/coglib.hxx</A>"
int main()
{
</PRE>

 <P>We also need a grid generator - an object of the abstract class
<B>Cogenerator</B>. For the first example, we use the grid generator
from the derived class
 <B><A HREF="cogenoctree.html">CogenOctree</A></B>.  The related pointer
type is <B>cogenOctree</B> (don't use CogenOctree* for pointers).

<PRE>
  cogenOctree gen = new CogenOctree();
</PRE>

 <P>Then, we define the bounding box for grid generation:

<PRE>
    gen-&gt;setBorder(0.0,1.0, 0.0,1.0, 0.0,1.0);	// 3D unit cube
 // gen-&gt;setBorder(0.0,1.0, 0.0,1.0);		// 2D unit square
 // gen-&gt;setBorder(0.0,1.0);			// 1D unit segment
</PRE>

 <P>That's all we need for our first test example. Now, we can call
the grid generator:

<PRE>
 wzgrid grid = (*gen)();
</PRE>

 <P>Now we can use the grid, for example, write it into a file:

<PRE>
  grid-&gt;write("test.sg");
}
</PRE>

 <P>The grid is now written into a file "test.sg" in
 <A HREF="simplexgrid.html">SimplexGrid 2.0</A> format.  Using the
 <A HREF="maingridviewtest.html">OpenGL Grid Interface</A> you can
have a look at the grid:

<P><IMG SRC="starttest.gif">

 <P>Now, in our tutorial we continue with
 <A HREF="mainoctreetest.html">other possibilities of the class
CogenOctree</A>.