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+\chapter{The skeleton code}

+

+The provided code for the course contains an implementation of a real-time fluid flow simulation. The fluid flows under the influence of a user-controlled force

+field. The simulation follows the Navier-Stokes equations for fluid flow. These equations describe how the velocity, pressure, temperature and density of a moving

+fluid are related. \\

+

+\section{Grid-based smoke}

+

+The visualization is done using a two dimensional grid as opposed to particle-based smoke visualization techniques. At every vertex a number of fluid attributes are

+stored. The skeleton program keeps track of the density, velocity and force. Using different techniques, these attributes can be visualized. Each and every

+attribute has its own 'preferred' visualization technique. \\

+

+Using these values at the cell's vertices all sorts of techniques, additional values and other useful info can be used. The values are used in colormap techniques,

+calculation of the divergence and the rendering of the hight plots. \\

+

+\begin {center}

+  \includegraphics[width=70mm]{flow_vis.png} \\

+  Figure 2: Fluid visualization \\

+\end {center}

+

+The above screenshot shows us the fluid movement using a grey colormap. This simple yet effective visualization technique is explained in chapter 3. \\

+

+\section{Internal structure}

+

+The first assignment was to simply compile the code. That was fairly easy. However, the code was a bit unstructured. Everything was put into one big file. To be

+able to add additional functionality without losing sight of what we were doing, we created a new file for every new technique we implemented. The second thing we

+did is we split up the calculations, the rendering functions and user interactions from each other. \\

+

+With this new structure we were able to manage the code and add additional functionality. We also used SVN to manage our project. This was very useful since we both

+had different development environments and also did a lot of work at home. \\