ShaderWorksPython for ArtMaterials: Dirty shaders
This script is the companion product to Dirts Shaders by Olivier Vinet. It allows to apply the shaders on multiple materials at once, keeping the 'previous' shaders for increasing realism. This script also provides an easy way to change all the editable values from the shaders.

The user interface displays all the settings in one window. No need to browse for the shader, to search the nodes and go through each materials... Everything is controlled from one unique dialog!
