VRML documentation

## Features:

- reads models in MGF and new XRML (extended VRML'97) file format.
- images can be saved in PPM, TIFF and Radiance PIC format, for which numerous convertors exist.
- supports high dynamic range TIFF and PIC image output, suitable for lighting analysis purposes, e.g. using Radiance tools, or experimentation with tone mapping techniques ...
- illuminated models after radiosity can be saved in VRML'97 format.
- X-Windows/Motif based user interface.
- interactive navigation using graphics hardware (OpenGL) with various optimizations that make it suited for large models.
- wide range of tone mapping operators + calibrated monitor support.
- batch rendering with control through command line arguments or Inter Process Communication.
- rendering into an external canvas window makes RenderPark behave as a "plug-in" in other applications.

## Rendering algorithms implemented:

Object-space radiance algorithms:

- Galerkin radiosity (both gathering and shooting) with (or without) hierarchical refinement, higher order approximations, clustering, view-importance, ...
- Stochastic Jacobi radiosity, also hierarchical with clustering, higher order approximations and view-importance as described in Philippe Bekaert's PhD thesis (recommended radiosity method)
- Various random walk radiosity algorithms
- Photon Mapping

Pixel-driven radiance algorithms:

- stochastic ray tracing (usable as a second pass after an object-space radiance algorithm, with special support for the photon map)
- bi-directional path tracing. Using regular expressions, you can tune exactly what part of the light transport shall be computed.