ge body and solidity. The programs used to do this are called shaders. Shaders can not only add color fills but also simulate a variety of other surfaces such as walls, metal, fabric, glass, wood, sky, and fur. A process called texture mapping can apply a bit-mapped image over a surface to give it a more realistic appearance like putting wallpaper on a wall ("Multimedia").One form of shading is called ray tracing. Just as on a stage or movie set, you arrange light sources to illuminate the object and position your “camera” ("Integrated Services Digital Network"). The ray tracer calculates the light rays and figures out where there should be highlights and reflections on the model.The edge pixels may give an image displayed on the screen ragged edges. Anti-aliasing smoothes the edges of the image by altering the contrast and colors of its edge pixels, making the contours of the image appear truer and easier to see.Morphing blends two images to create a third. Starting with photographs of a young girl and an elderly woman, the morphed image shows someone with the characteristics of both. When done as a series of steps, an animation shows the girl growing old. To make morphing realistic, certain areas of the image, such as the eyes, must be overlapped on the first and last images and locked into place. This way, other parts of the image seen to transform around these fixed points (Curtin 223). ...
