Research On Modeling And Three-Dimensional Visualization Of Lobster Surface

The geometric surface structure and body morphologies of aquatic creatures have been evolved millions years for adapting the surroundings. Such as the large and small lobsters are more similar to each other abdominal somite composition. The body segments from the head to the tail successively arranged. The posterior abdominal segments are covered with previous somitic carapaces which can help to strengthen the lobster athleticism. Big lobster (WA Red Dragon) and crayfish (Red swamp crayfish) were taken as the main research animals. The surface morphological structure of lobster from the macro and micro scales were observed and were analyzed by stereomicroscope and laser scanning confocal microscope. Lobster surface point cloud data were acquired with reverse engineering technology. The characteristics of point cloud data of lobster surface were analyzed in CATIA and IDL. Establishing mathematical model method of lobster surface were discussed by visualization technology.All parts of the body of two species were observed, analyzed and compared in the macro and micro by stereomicroscope (SZX12) and laser scanning confocal microscope (OLS3000). It was found that there were thorns, pits, protrusions, bristles and other non-smooth structure on macro-structure and there were hollow, pits, protrusions, bristles and other non-smooth structure on micro-structure. It was shown that lobster surface under different scales had the structure similarities.The point cloud data of the large and small lobster surface abdominal were acquired with reverse engineering technology. The point data were input into CATIA three-dimensional molding software. The point cloud data were filtered and eliminated noise etc. The plane intersection file of the point data were acquired with"Digitized Shape Editor"of CATIA software. Through the comparative analysis with the test photos get correspondence of data storage format on planar into line file and the set space coordinates. The first, second and third point cloud data of plane into line files corresponded Z, X, Y axis of the set space coordinates. The plane into line files were input into Excel and get lobsters abdomen corresponding regression curve and the second order polynomial regression equation in different section.By the ASCâ…¡Template order and programming etc two approaches, the point data files were put into IDL software and compared the advantages and disadvantages of the two methods. ASCâ…¡Template order handled without programming, but command is time-consuming. When IDL basic programming skills were mastered, the point cloud data files were read-in IDL software by programming once. The iTools graphical intelligent tools were called and the each column of the cloud files were analyzed contrastively. The correspondence of the each column of data of the cloud files with the set space coordinates were established and could obtain the part of parameters of 3D laser scanner. To X axis 10.2 mm place namely scanning line second order polynomial regression analysis on yz plane showed that the regression curve and the scan line were basically coincident. The second polynomial regression equation could nicely describe the morphological characteristics of small lobster abdominal surface.The characteristics of the point cloud data were comparatively analyzed in the CATIA and IDL software. Establishing mathematical model method of lobster surface were used by visualization technology. It was shown that the handling of the point cloud file such as filtering and delete noise had more advantages in the CATIA software, but point cloud files in the visualized modeling had more advantages in the IDL software.The results provided technological base on further study of coupling effect analysis which about the visualized modeling method of biological surface and macro morphology, structure and materials of biological surface.