Shrimp Shader Generator FLTK2 GUI (SVN)

Added a displacement and bump mapping examples (note: the background object needs to have the displacement shader removed, only the surface grid should exist)

Tweaked the fractals header a bit, updated the Voronoi blocks so that the metric choice variable is now of uniform storage.

Added workaround for PRMan on complex math header, as reported.

ENH: UI rework (bigger window, added scene chooser to the main window)

ENH: smaller font size as FLTK 2 (version 6671) introduced FreeType; connections drawn in light red, now different from the font colour

ENH: added rconstruct's texture tags to the renderer definition file

Renamed RSL's include tag to rsl_include

Updated Banks model for __nondiffuse and __nonspecular cases.

Fixed an wouwou in complex division (trying to store a vector in a float via cx_set), and order of functions (workaround for Aqsis, thanks Tobias Sauerwein).

Updated the shading models header for a fix in the geometric attenuation function of the Cook-Torrance model - the workaround for the Pixie spline() linear basis is no longer needed.