Shrimp Shader Generator FLTK2 GUI (SVN)

Added diffuse falloff block. Tweaked lafortune block, changed some defaults. Tweaked the shading model headers, added the new diffuse falloff function, and factored in nondiff and nonspec for the outputs, since besides an on/off switch, they can be a scaling factor for light intensity.

NEW: console output example

Added Luke Emrose's implementation of Neulander & Van de Panne occlusion. (Note: need primitive variables, implement primitive variable blocks later & tweak AOVs).

ENH: split shader blocks inthe rendered scene, $(shaders) now comes with the surface_shaders, displacement_shaders, volume_shaders and light_shaders variables

drag no more do a selection only highlight the block, for selection LMB.

mouse over block & left mouse button click = block selected
mouse over empty area & left mouse button click = deselect all
mouse over empty area & ALT key pressed = move scene (needed to prepare region selection)

Continued tweaking input pad text.

mouse over block = block outline in "hover orange"

mouse over block = block outline in "hover orange"

mouse over block = block outline in "hover orange"