Java Programing

Figure 14.6 The TexCoordTest example application in action. The vertices in the undulating landscape do not have assigned texture coordinates, but rather a TexCoordGeneration object is used to calculate texture coordinates dynamically OBJECT_LINEAR mode The OBJECT_LINEAR texture coordinate generation mode calculates texture coordinates based on the relative positions of vertices. The TexCoordTestexample creates a simulated landscape that has contours automatically mapped onto the landscape Everything above the y = 0 plane is texture-mapped green, while everything below is texture-mapped blue. Figure 14.7 illustrates the texture image used in the TexCoordTestexample for dynamic texture mapping. The texture image is 64 x 64 pixels and merely contains a single row of pixels that is of interest the rest of the image is ignored. The bottom row of the image (t = 0) defines the colors to be dynamically applied to the landscape. The midpoint of the row (s = 0.5) defines the elevation = 0 (sea level) contour, while everything to the left of the midpoint is used for elevations below sea level, and everything to the right is used for elevations above sea level. Different colored pixels for contours are evenly spaced from the midpoint. Figure 14.7 The texture image used to perform dynamic mapping of texture coordinates in the TexCoordTest example application To map contours onto the landscape we merely need to define a mapping from the y coordinate of the landscape to the s coordinate of the texture image. That is, we are defining a 1D-to-1D mapping from vertex coordinates to texture coordinates. 239

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