Summary of changes in version 3.5:
Major new features:
* New noise functions
* Photon mapping
* Dispersion
* Improved Radiosity
* New light sources
* Light groups
* Isosurface and parametric objects
* Sphere sweep object
* New mesh object
* UV Mapping
* Improved textures
* Improved and faster media
* New patterns
* Functions
Additional new features:
* Reading of JPEG and TIFF image formats
* Projected through
* More realistic attenuation
* New clock keywords
* New image size keywords
* Inverse transform
* Spherical camera
* New float function: inside
* Splines
* Metallic reflection
* Mapping using warps
* Double illuminate flag
* No image and no reflection flags
* Basic Unicode Support
* Declare a float constant from an INI file
Bug fixes and enhancements:
* Light source enhancements
* Fixed normal average, reflection and other related problems
* Fixed cylinder camera problems
* Fixed the use of multiple closed bezier-splines in prism
* Fixed infinite cone bug
* Fixed the use of two subsequent colors, not separated by a comma in
checker, hexagon and bricks.
* Fixed gamma correct bugs
* Numerous other bug fixes and optimizations
