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<TITLE>COG 2.0: refinement</TITLE>

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<H1>COG 2.0: refinement</H1>

 <P>Now, let's consider how to create curved grids with coordinate
transformations.  As an example, we use polar coordinates. First, we
create a rectangular grid in these coordinates as before:

<PRE>
#include "<A HREF="coglib.hxx">cog/coglib.hxx</A>"
int main()
{
  cogenOctree base = new CogenOctree();
  base-&gt;addBox(wzRegion(2), 0.0,1.0,0.0,1.0);
  base-&gt;addBox(wzRegion(3), 0.3,0.6);
  base-&gt;addBox(wzRegion(4), 0.3,0.6, 0.3,0.7);
  cogenRefine gen = new CogenRefine(base-&gt;generator());
  gen-&gt;refinementGlobal(0.21,0.21,0.1);
  gen-&gt;faceRefinementGlobal(0.026,1.0);
//  gen-&gt;refinementIsotropicalInRegion(0.02,wzRegion(4));
//  gen-&gt;refinementIsotropicalNearPoint(0.02,0.04,0.6,0.8,0.0);
//  gen-&gt;refinementNearPoint(0.02,0.1,0,  0.2,0.1,0,  0.6,0.4,0);
</PRE>

<PRE>
//  wzgrid grid = (*base)();
  wzgrid grid = (*gen)();
  grid->write("ibg.sg");
}
</PRE>