Parameters (in bold)

• level (0 = leaf nodes)
• alphaScale
• scale
• power

1. Each line of the input file is inserted into a PrOctree^?. (OctreeExtractor^?)
2. The mass of every leaf node in the tree is added to a SumOctree^?. (DensityClassifier^?)
   1. A new leaf node containing the particle mass is added at the bottom level of the SumOctree^?.
   2. The particle mass is added to the parent (internal) node's mass recursively until the top node is reached.
   3. Now for every internal node in the SumOctree^?, at every level, the sum of the mass of all of the particles in that division of space is stored.
3. The sum for every node at a certain level is then manipulated in a way to get an RGBA value. (DensitySplatter^?)
   1. For each node at a certain level, calculate h=(node.sum/ scale )^power .
   2. Convert h to an RGB value using Hsb2Rgb.
   3. Convert h to an alpha value using a = h*alphaScale

-- EdwardDale - 01 Jun 2006