https://communities.bentley.com/communities/other_communities/chinafirst/f/microstation-projectwise/185018/mesh-xy想将一个三维mesh网格投影到XY平面。。。 原网格： 投影后： 请问如何达到这样的效果？？？en-USTelligent Community 12https://communities.bentley.com/thread/542397?ContentTypeID=1Fri, 06 Sep 2019 00:52:18 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:50c132ca-951e-4531-9e9b-66e50a1d2036程远 李<p>已经做了，谢谢</p><div style="clear:both;"></div>https://communities.bentley.com/thread/542190?ContentTypeID=1Thu, 05 Sep 2019 08:54:54 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:74c06a65-9257-40d0-a40c-37f617214a0bYongan.Fu<p>那看起来真得采用你想的那个办法了。遍历Mesh的每个Facet，将其每个点投影到XY平面上。然后用这些点重新构造一个Mesh？</p><div style="clear:both;"></div>https://communities.bentley.com/thread/542178?ContentTypeID=1Thu, 05 Sep 2019 08:31:47 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9aa51edc-e8b7-4c61-9cf1-7a837fbbced4程远 李<p>对于基本元素操作后可以得到平面元素：</p> <p>操作前<img alt=" " src="/resized-image/__size/254x240/__key/communityserver-discussions-components-files/343510/7737.png" /></p> <p>操作后<img alt=" " src="/resized-image/__size/310x240/__key/communityserver-discussions-components-files/343510/4466.png" /></p> <p>可是对于网格操作后还是原来的元素。。。</p> <p>操作前<img alt=" " src="/resized-image/__size/256x320/__key/communityserver-discussions-components-files/343510/3264.png" /></p> <p>操作后得到和原来元素同样的元素<img alt=" " src="/resized-image/__size/293x344/__key/communityserver-discussions-components-files/343510/5165.png" /></p><div style="clear:both;"></div>https://communities.bentley.com/thread/542085?ContentTypeID=1Thu, 05 Sep 2019 01:58:52 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9d49d27a-e25e-4f7e-b572-dd5d87306d9aYongan.Fu<p>请参考两个核心函数：mdlTMatrix_computeFlatternTransform和mdlElmdscr_transform</p><div style="clear:both;"></div>https://communities.bentley.com/thread/542083?ContentTypeID=1Thu, 05 Sep 2019 01:45:34 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:96184028-9191-4423-8762-a39b19519e2a程远 李<p>您好，能稍微详细点吗？</p><div style="clear:both;"></div>https://communities.bentley.com/thread/542077?ContentTypeID=1Thu, 05 Sep 2019 01:14:53 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:c9bc7c70-77a9-47e6-ac4f-648c2cb62c06Yongan.Fu<p>构造一个压扁变换矩阵（flattern transform），然后对该元素执行变换即可。可以对任意元素执行该操作。</p><div style="clear:both;"></div>https://communities.bentley.com/thread/541911?ContentTypeID=1Wed, 04 Sep 2019 09:32:40 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:1195c687-725d-46b9-8f54-2512aacae79a程远 李<p>实在不行的话是不是需要遍历mesh的所有顶点然后一个个顶点投影？？？</p><div style="clear:both;"></div>https://communities.bentley.com/thread/541903?ContentTypeID=1Wed, 04 Sep 2019 09:10:03 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:2d7e676d-4fcf-4372-bdba-246b7742e036程远 李<p>而且那个工具是展开，我要的效果是投影，结果并不相同，展开后的面积要大一些</p><div style="clear:both;"></div>https://communities.bentley.com/thread/541894?ContentTypeID=1Wed, 04 Sep 2019 08:48:50 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:dd68bda8-a31d-4d43-bab5-a10cf2a94508程远 李<p>请问能用mdl代码实现吗？？</p><div style="clear:both;"></div>https://communities.bentley.com/thread/541890?ContentTypeID=1Wed, 04 Sep 2019 08:39:46 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:40dc94c2-45b3-4b99-bf96-6beb4b1dbae9HongQiang Guo<p>Mstn有现成的工具可以实现：</p> <p><img alt=" " src="/resized-image/__size/320x240/__key/communityserver-discussions-components-files/343510/Annotation-2019_2D00_09_2D00_04-163952.jpg" /></p><div style="clear:both;"></div>