I've found that it's damn hard to rescale a whole shader on an object ! I'd wish there was some kind of "global scale" slider in the shader room ... But i've got a trick, which saves me to dig through the shader tree and change manually every single procedural function . The trick is that i change the scale of the object LOCALLY, that means in the modeler room . Then, back in the assemble room, i resize the object in the properties tray to make it retrieve its original scale . All the shaders functions that use local coordinates will deform with the object . For example, you can resize a vertex objet to 200% in the Y axis in the modeler, then go back to the assemble room and resize the object to 50% in the Y axis . The scale of the object in the scene will be the same as before, but the shader scale will change in the Y axis . This technique works well for vertex objects, and terrains . Spline, facets or Metaballs don't support this very well :( . I hope it helps . If it's not very clear, i can post some examples . litst