Chapter 4: mental ray and materials 6. Close all windows and dialogs and save the file. It should already be called Ch04_combiner_02.max. In preparation for adding extra bump maps to the floor tiles, you have used masking techniques at the map level for a more convincing distribution of glossiness and reflectivity. The client has decided that he would like a textured Spanish-like style in which each tile has a slightly bumpy surface. 3ds Max 2010 and 3ds Max Design 2010 have a new material type called the Utility Bump Combiner that contains the base material and then provides multiple bump slots so that you can "stack" bump maps. However, as you'll see, the bump maps are applied to everything in the material--tiles and grout. You want only the tiles to have the added bump map and will have to apply a Mask map to reveal the extra bumps only in the tiles area. 4.5.3.2 Exercise:Combiningbumpmapsin Arch&Designmaterial 1. Open the file called Ch04_combiner_02.max if it isn't still open from the preceding exercise. Save it to your hard drive with the name Ch04_combiner_03.max. Open the Material Editor and make sure the Title_terracotta sample window is highlighted and that you are at the top level of the material. You need to change this Arch & Design material type to the Utility Bump Combiner