Hi John, What you are describing is a work flow issue. As each object is completed, it's best to immediately assign it a shader. (While it would be nice to group objects and drag a shader onto the group, Carrara obviously doesn't allow that.) However, once you have assigned a shader to all of the objects, any subsequent changes you make to the shader will automatically update any object that it is used on. So how do you assign a shader to a bunch of objects now? If they are so close together that dragging a shader onto them is a problem, try using the property tray. There is a pull down menu that allows you to select any object in a scene by name. Then immediatly below that is another pull down menu that allows you to select a shader for the object. It still might take a little time but is workable though. I'm not clear on your replicate issue. What do you mean by using a pattern? Mark