几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量  


返回   几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量 » 仿射空间:CAX软件开发(三)二次开发与程序设计 » CAD二次开发 » AutoCAD二次开发 » DirectDWG
用户名
密码
注册 帮助 会员 日历 银行 搜索 今日新帖 标记论坛为已读


回复
 
主题工具 搜索本主题 显示模式
旧 2009-05-04, 05:22 PM   #1
yang686526
高级会员
 
注册日期: 06-11
帖子: 14579
精华: 1
现金: 224494 标准币
资产: 234494 标准币
yang686526 向着好的方向发展
默认 【转帖】can i use oddbpolygonmesh to create an solid 3d from a conve

can i use oddbpolygonmesh to create an solid 3d from a conve
can i use oddbpolygonmesh to create an solid 3d from a convex polygon such as lshape?
i just wonder if i can use oddbpolygonmesh to create a solid 3d lshape. in odwriteex sample, oddbpolygonmesh is used for a none-convex polygon.
thanks.
oddbpolygonmesh is a 3d surface. it's specified by array of vertices (mxn)
sergey slezkin
i try to create a solid 3d polyhedron lshape with this code
code:
void dbfiller::addlshape(const oddbobjectid& btrid)
{
oddbblocktablerecordptr bbtr = btrid.safeopenobject(oddb::kforwrite);
oddbpolygonmeshptr pmesh = oddbpolygonmesh::createobject();
pmesh->setdatabasedefaults(bbtr->database());
bbtr->appendoddbentity(pmesh);
int msize = 2, nsize = 6;
pmesh->setmsize(msize);
pmesh->setnsize(nsize);
// start profile (6 vertices)
odgepoint3d point1 = odgepoint3d(0.0, 0.0, 0.0);
odgepoint3d point2 = odgepoint3d(0.0, 10.0, 0.0);
odgepoint3d point3 = odgepoint3d(4.0, 10.0, 0.0);
odgepoint3d point4 = odgepoint3d(4.0, 4.0, 0.0);
odgepoint3d point5 = odgepoint3d(10.0, 4.0, 0.0);
odgepoint3d point6 = odgepoint3d(10.0, 0.0, 0.0);
// end profile (6 vertices)
odgepoint3d point7 = odgepoint3d(0.0, 0.0, 10.0);
odgepoint3d point8 = odgepoint3d(0.0, 10.0, 10.0);
odgepoint3d point9 = odgepoint3d(4.0, 10.0, 10.0);
odgepoint3d point10 = odgepoint3d(4.0, 4.0, 10.0);
odgepoint3d point11 = odgepoint3d(10.0, 4.0, 10.0);
odgepoint3d point12 = odgepoint3d(10.0, 0.0, 10.0);
appendpgmeshvertex(pmesh, point1);
appendpgmeshvertex(pmesh, point2);
appendpgmeshvertex(pmesh, point3);
appendpgmeshvertex(pmesh, point4);
appendpgmeshvertex(pmesh, point5);
appendpgmeshvertex(pmesh, point6);
appendpgmeshvertex(pmesh, point7);
appendpgmeshvertex(pmesh, point8);
appendpgmeshvertex(pmesh, point9);
appendpgmeshvertex(pmesh, point10);
appendpgmeshvertex(pmesh, point11);
appendpgmeshvertex(pmesh, point12);
pmesh->makenclosed();
}
when i view it in autocad with gouround shaded, it is not a solid 3d because it misses 2 polygons (the start polygon with 6 vertices and the end polygon with 6 vertices). any idea, to fix the problem?
thank very much.
last edited by hnguyen; 14th august 2007 at 01:43 pmfff">.
each face of polygon mesh has 4 vertices (if 2 of them coincide it's a triangle).
number of faces is (m-1)x(n-1) if mesh is not closed or mxn if it's closed in both directions.
vertices is array mxn.
the 4 corners of the face are defined by the vertices with indices:
m,n
m+1, n
m+1, n+1
m, n+1
in your example (m=2, not closed; n=6, closed)
you defined 6 faces.
sergey slezkin
yang686526离线中   回复时引用此帖
GDT自动化论坛(仅游客可见)
回复


主题工具 搜索本主题
搜索本主题:

高级搜索
显示模式

发帖规则
不可以发表新主题
不可以回复主题
不可以上传附件
不可以编辑您的帖子

vB 代码开启
[IMG]代码开启
HTML代码关闭

相似的主题
主题 主题发起者 论坛 回复 最后发表
【转帖】brep to solid conversion yang686526 DirectDWG 0 2009-05-04 05:01 PM
【转帖】how do i create an installer api projec yang686526 SolidWorks二次开发 0 2009-04-13 11:50 AM
【转帖】auto create 11 flat pattern and save as dxf yang686526 SolidWorks二次开发 0 2009-04-13 09:08 AM
Vc下编程实现3d文字 huangyhg vc编程 0 2009-01-21 12:29 AM
3d图形名词术语大放送 huangyhg 图形算法 1 2007-10-15 06:30 PM


所有的时间均为北京时间。 现在的时间是 06:37 PM.


于2004年创办,几何尺寸与公差论坛"致力于产品几何量公差标准GD&T | GPS研究/CAD设计/CAM加工/CMM测量"。免责声明:论坛严禁发布色情反动言论及有关违反国家法律法规内容!情节严重者提供其IP,并配合相关部门进行严厉查处,若內容有涉及侵权,请立即联系我们QQ:44671734。注:此论坛须管理员验证方可发帖。
沪ICP备06057009号-2
更多