about.html

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<TITLE>About IBG</TITLE>

<H1>About IBG</H1>

 <P>The grid generation and geometry description package IBG allows to
describe complex geometries and to create grids in 2D (triangular
grids) and 3D (tetrahedral grids).

 <P>For complex geometries it creates separate grids for the different
regions and on the boundaries the related boundary grids. Thus, IBG
may be used also to create surface grids.

 <P>IBG is distributed as a package of ANSI C source code. To use IBG,
some knowledge about C is necessary. There are some example files which
may be used as patterns.

 <P>The most interesting point is the geometry description. There is a
wide range of possibilities for geometry description:

 <UL>
 <LI> Pictures.
 <LI> Characteristic functions: the region is described by f(x)&gt;0.
 <LI> Intersections of other geometry descriptions.
 <LI> Interpolation from another grid.
 </UL>

 <P>The usual way of geometry description which requires an explicit
boundary discretization is also possible, but not recommended.