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3D Modeling from Contours A photograph of the tadpole was mapped to a surface plane of the calculated metric size of the image. B-splines were traced over the photograph in the xy plane. Tracing of the lateral photograph included the contour shape, as well as other clearly delineated anatomical structures. The lateral countour tracings also included anticipated highpoints for the tail and gut. As the tail and gut are approximately radial, the highpoint was near the median axis. No longitudinal lines were traced; however the control vertices of the multiple latitudinal b-spline tracings were paired in an approximate longitudenal orientation. Additional photographs of the dorsal and ventral views were mapped to appropriately orientated planes. Rather than introduce new contour lines, the lateral tracings were adjusted in the z directions to fit the dorsal and anterior photographs. The modeling of our specimen continued by connecting the contour splines in a grid like fashion. The grid spacing is now mostly consistent, but tightly grouped in areas requiring detail, using triangular sections when necessary. A surface modifier was applied to produce bezier surface patches and generate a 3D surface model. |