Shrimp Shader Generator FLTK2 GUI (SVN)

Added the Buratti and Lommel-Seeliger blocks as well as their respective functions in the shading models header. Added some useful constants in helpers. Tweaked the shading models and distributions in their respective headers, into hopefully a more readable code. Added a note on the Cook-Torrance block regarding normalization of the Trowbridge-Reitz microfacet distribution.

FIX: unsupported display could be assigned when changing render engine from the main window

SConstruct file cleanup

ENH: texture basic commands are loaded from renderers file

Updated texture blocks for the blur/width problem - these values were always bypassed by sblur/tblur and swidth/twidth. Added usage information, and an extra option for 3delight, for the texture() shadeop, the ability to specify the samples to use when the filter type is box.

Add tangent space normal map block, to read normal maps such as the ones from popular 3d sculpting applications.

Added function to read/convert tangent space normal maps, such as the ones from 3d sculpting applications.

Fixed example tangent normal map scene.

Added example to use tangent space normal maps, and an included tangent space normal made (gimp generated & normalmap plugin, sobel 3x3, from capillary reaction diffusion texture/Turing pattern). Texture in .tif format, the example reads it from $HOME/.shrimp/temp/ , so the installer should copy all the textures needed to this location.

Added surface curvature on displaced surface example.