Polygon Modeling: (Inside Softimage Chapter 7) Invoke the Deformation]BumpMap command and set the parameters as you wish in the dialog box (see Figure 7.55). *** See Figure 7.55 fig7_42_Bumpdialog.jpg*** The BumpMap+ dialog box. Start by directing the tool to the picture file you want to use with the Browser button. Then pick the projection plane for the image to be mapped onto the surface. If the mesh is in the default XZ plane, visible from the top in the Top view window, use the ZX projection. The UV projection doesn«t seem to work, so avoid it. The Height of Bumps control sets the overall amount of deformation applied by the effect in Softimage units. The contribution to that amount for each channel of the image (red, green, blue, and alpha) can be adjusted by setting the Channel factors from 0.0 to 1.0, where 0.0 is no influence at all and 1.0 is all the influence possible for that channel. (Setting the numbers higher than 1 has no effect.) The Filter Type determines which filter is applied to smooth the map between vertices that fall between pixels, and Gaussian should yield more accurate resultsyy. You can choose to deform all the vertices on the mesh or only the tagged ones, and the vertices can be moved in a positive Y direction, or along the average of the neighboring normals. While moving along the normals yields more accurate and interesting results if you deform the surface manually before applying the effect, you will need less main bump height. Click the Ok button to close the BumpMap+ dialog, and then pick the mesh to complete the effect. The BumpMap tool is a very professional method for painting and then modeling complex surface terrain for later use in 3D worlds, and it was used to create the amazing island landscapes in Cyan«s incredible game Riven (see Figures 7.56 through 7.59). *** See Figure 7.56 fig.7.CyanGeoMapGrey.jpg*** A grayscale displacement map painted to create an island for the Cyan CD-ROM game Riven. Printed courtesy of Cyan Inc. Copyright 1997. *** See Figure 7.57 fig.7.CyanGeoMapColored.jpg*** The island displacement map with the map of the island superimposed on it showing features. Printed courtesy of Cyan Inc. Copyright 1997.