Modeling the Form and Appearance of Fishes
To achieve realistic computer animation, our artificial fish model must capture the form and appearance of real fishes with adequate fidelity. In this chapter we design texture mapped, 3D geometric display models with which to “envelope” the biomechanical fish model described in Chapter 4, thus constructing different artificial fishes. We begin with color photographs of real fishes and build free-form geometric models of several different species using nonuniform rational B-spline (nurbs) surfaces. We develop a new interactive tool for segmenting portions of the fish images to be used as texture maps that are subsequently rendered onto the geometric display surfaces. Finally, we describe how this geometric display model is coupled to the dynamic model of the fish to appropriately actuate and deform the display model. We also describe the visualization of the pectoral fin motion in the display model.
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