| APSF | Generates the rendering filter |
| BLUE_NOISE | Daniel Dunbar's blue noise generator |
| CELL | Basic cell data structure of the quadtree |
| CG_SOLVER | Conjugate gradient Poisson solver |
| CG_SOLVER_SSE | Conjugate gradient Poisson solver that exploits SSE |
| DAG | Directed acyclic graph that renders the final lightning |
| EXR | Wrapper for the ILM OpenEXR routines |
| FFT | Wrapper class for FFTW |
| QUAD_DBM_2D | Quadtree DBM solver. This is the highest level class |
| QUAD_POISSON | Quadtree Poisson solver |
1.4.6