Fast Learner Posted November 24, 2008 Share Posted November 24, 2008 Hello everyone I'm new here. I have questions all the time and I figured this would be the best place to get answers. Ok I'm trying to do a ground survey in 3D and of course when the survey comes in autocad it already has 3D values. The only way I can figure to draw it is to use a polyline and connect a few dots, extrude them and then shade. My problem is when I draw the polyline, say triangle, all three points stay at the elevation of the first point. What am I doing wrong? Or how should I be doing it? Thank you. Quote Link to comment Share on other sites More sharing options...
eldon Posted November 24, 2008 Share Posted November 24, 2008 Normal Polylines can only be drawn at one elevation. Try using a 3DPolyline. If you want to make a closed polyline, be sure to use the close option instead of drawing the final leg. Quote Link to comment Share on other sites More sharing options...
shift1313 Posted November 24, 2008 Share Posted November 24, 2008 depending on how the points are laid out you can do a spline between a bunch of points on the same elevation, and make a surface or loft between them. Quote Link to comment Share on other sites More sharing options...
rgarjr Posted November 24, 2008 Share Posted November 24, 2008 Thing that sucks about 3DPoly's is that you can't have any fillets on them. Quote Link to comment Share on other sites More sharing options...
fuccaro Posted November 25, 2008 Share Posted November 25, 2008 Fast Learner Try the PFACE command. Altrough it is for creating surfaces using applications, it can be used manually. Quote Link to comment Share on other sites More sharing options...
Fast Learner Posted November 25, 2008 Author Share Posted November 25, 2008 Thank you all very much! I guess I would have found it if I picked my buttons but since I type in all the quick text I was lost at what to do. But thanks again Its coming together nicely now. Quote Link to comment Share on other sites More sharing options...
shift1313 Posted November 25, 2008 Share Posted November 25, 2008 here is another thing that may help. make multiple viewports so you can see your drawing from different angles. i just used the 3dpoly command and during your line creation you can select different viewports, just remember your tracking settings. Quote Link to comment Share on other sites More sharing options...
Fast Learner Posted November 25, 2008 Author Share Posted November 25, 2008 Ok my next step? Ok if I drew a grid using all the survey points and just the line comand. Is there a way to convert all those lines into 3d polylines? How would I go about that? Now that I know how to get the job done I want to know a fast way to do it. I'm not very good at writing a lisp yet so I need another way. Quote Link to comment Share on other sites More sharing options...
shift1313 Posted November 25, 2008 Share Posted November 25, 2008 im not sure if there is a way to do this. If you use a SPLINE it will be a single entity through all your points. If you are using survey lines shouldnt you have measurements with the same elevation? if so or if all your lines are planar you can use the pedit command to join them, but they have to all be in the xy plane. Quote Link to comment Share on other sites More sharing options...
scj Posted November 29, 2008 Share Posted November 29, 2008 Perhaps my PEDIT3D.lsp (see http://www.black-cad.de) can help... Good luck Jochen Quote Link to comment Share on other sites More sharing options...
tobes_1983 Posted November 29, 2008 Share Posted November 29, 2008 There are a few ways that you can do this in autocad - none of them particularly good. If you have the architecture version of the software you can use the DRAPE tool - This creates a terrain model as an AEC object from any lined object or point with a z-axis. It smoothes everything out and can create very detailed and complex survey models. The drawback on this method is that it doesn't always work accurately and that you cannot delete chunks out the object of it once its created - or if anyone knows how, please tell me! Another option is 3DFACE which creates a 3d surface anywhere in 3d space with either 3 or 4 sides. If you have already joined your survey points using the 3DPOLY command you may then only need EDGESURF. 3DMESH also works but its not the most user friendly way of creating a mesh and it often doesn't import into 3ds max properly! Quote Link to comment Share on other sites More sharing options...
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