DS Icem Surf 2017 Free Download
this paper presents an efficient method for collision detection of the two closed surfaces. the closed surface model is divided into several fragments and the centroid is used to mark the triangle corner of the fragment. the union of the fragments is then utilized to calculate the convex hull of the fragment and an overlap mesh of the two convex hulls is obtained. finally, the result of the overlap mesh is used to detect the collisions between the two convex hulls.
the most frequently used operation during the early stage of surgeryis the fixation of an implant. the choice of the most appropriateimplant depends on the bone density, the configuration of thescrew hole, the required force and the surface characteristics of theimplant. because the bone quality is different in each patient, theimplant should be designed with an individual screw hole and beadaptable for every situation. to simplify the process of the newimplant design, it is desired that the surgeon can quickly designthe new implant and can be informed about the risk of having tomodify it or replace it.
the first step of the design of the new implant is the creation ofits surface. icem surf provides various surface techniques suchas the model-based surface generation and the mesh-based one. thetolerance on the surface topography is dependent on the surface techniqueand the surface weight. for example, for the model-based surfacegeneration, the tolerance for the elevation changes is 0.03 mm, whichis less than the thickness of the bone. it is possible to display theimplant in different colors, to display the three-dimensional model ofthe implant, to show screw hole positions in the three-dimensionalmodel of the implant, to display the depth of the screw hole from theimplant and to measure the depth of the screw hole. for example,the surface of the implant can be displayed in different colors, andthe corresponding positions in the three-dimensional model of theimplant can be displayed in different colors. this can help the surgeon tosee the screw position in the three-dimensional model of theimplant.
mesh segmentation & clipping: mesh segmentation is based on the state-of-the-art method using standard methods, such as subdicsi, nurbs and b-splines. mesh segmentation results are compared to find out the best results. the over-represented regions or the invalid tube regions are to be removed automatically. if the user controls the removal of the over-represented regions, a program will be executed in real-time to remove the over-represented regions. the clipping edges are then drawn on the mesh. the user may choose to either clip the mesh with the largest part of the template or the smallest part of the template. if the user chooses to clip with the largest part, the clipping will be done with the boundary edge, which will not guarantee a perfect fit to the surface mesh. if the user chooses to clip with the smallest part, then it will be done with the smallest part edge. then, the template is applied to the mesh ( fig. 7).
after the segmentation of the template, the point loop is used to determine the edges of the template and the border edge. therefore, it may happen that there are bottlenecks that prevent the point loop for segmentation to work. to solve this problem, the edge clip is performed, and the edge of the template will be clipped from the border edge of the segmentation result ( fig. 4 ).
for an unconnected mesh of the template, an iterative pruning is executed. for an unconnected mesh, a circle is used to approximate the missing tubes. during this process, the coordinates of the points of the edge of the circle are updated until they pass over to the other side of the template. after the external surface of the template is removed, the internal surface of the template is connected using a combination of the edge inside loop and the border edge. in this study, collision point loop is used for clipping the two meshes. for the template surface, there are holes in the border edge, which makes it impossible to clip two meshes together. if those holes are within the border edge, the holes will be closed automatically. if they are not in the border edge but within the border edge, then the holes will be patched. otherwise, this problem will cause ambiguous clipping result. in order to avoid this problem, a hole merging is realized. each part of the template is clipped from the hole. then, the iterative clipping is executed. when the border edge of the hole is connected, two meshes that are cut by holes are also connected. the total surface is then cut by the hole boundary ( fig. 10 ).
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