| 摘要(英) |
Computer Aided Design and Manufacture (CAD/CAM) technology has been already develop for many years, with the fast accumulation of the model data base of geometry, if it could store the projection view of the best viewpoint of model ,and subsequently cooperate with the searcher that use the way of sketch contour to proceed the data comparison ,and it could supply to look up or take out of database, it will effect automation impetus.
In our research, it used STL format to sketch our model, first it used vertex and normal vector of STL data to set up the geometry data structure of the model, subsequently utilize structure of STL data choosing the initial viewpoint of formula；Starting plus weighing the initial viewpoint of face seen ,and then search another viewpoint by after adjusting viewpoint ,then adjust the projection view that the projected area got the final viewpoint；Finally rotate Z-axis, it make the model can have steady feelings on the vision.
In our research, it is provided a observed value of calculating viewpoint quality to determine the models via rotating that the projection view becomes better or not. The main consideration of observed value is vertex, face, edge and projected area.
Though it still unable to find out the suitable tactics and to get the best viewpoint about the model of hole, cylinder, round angle and oval etc. But in our research, if we used STL method, it could find the good projection view for the model of the polyhedron. |
| 參考文獻 |
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