I'm trying to model a 3d leadscrew. How can I extrude a 2d closed polyline in a straight line while at the same time twisting it (360° twist for every 1.5" along the path). I've tried loft, sweep, extrude all using the helix as a path. When I can get a result, it ends up being a corkscrew.
View 9 RepliesI am not able to extrude closed polyline shapes. I get the following message:
Cannot create solid from open curve.
Cannot sweep or extrude non-planar objects.
Unable to extrude the selected object.
Other folks have opened my drawing – some can extrude, some get the same or similar message. I’ve tried re-building the shapes to extrude. It worked with one thing this morning and now it won’t extrude again.
If there is a way to "flatten" a non curved polyline or series of lines to one straight segmented line, without altering the distances of each segment?
View 3 Replies View RelatedHow can I draw a wipeout matched with a closed polyline?
in the other word, a lisp program that prompted for a closed polyline and draw a wipeout by selected polyline.
I have used PEDIT to join multiple polylines, which now appear as polylines. But when I use QSELECT to show all open (non-closed) section, one polyline still shows up as open.
I've attached the file I'm working on. The polyline in question is the green outline on the object on the right.
I am currently working on a playground development for a school project where we have to build a 3D playground based off of autocad drawing, modles, etc.Below is a picture of a "crab see-saw" that I have in my park, and I am having trouble making it 3D. I have tried using "extrude", but, while it streches the drawing into 3D, only the crab's claws become a solid object. The crab's body remains "open".
Crab.jpg -> Normal Drawing
crab2.jpg -> Extruded Drawing
The steps I take to extude it are:
1. Select extrude command
2. Select entire drawing
3. Click top of crab body for designated height
4. Type in 7 (units) as the strech command
5. Press enter
All the lines for the crab body are connecterd and I just can't figure out why it isn't working.
Is there a way to make a object with straight lines to change the straight line to be undulated like a curly.
View 14 Replies View RelatedI have region is in external dxf file,how to extrude it along polyline?I can't get region after using dxfin method
Database myDxfDb = new Database(false, true);myDxfDb.DxfIn(filename, logFilename);Matrix3d dxfTrf = Matrix3d.Identity; _ThisDatabase. Insert(dxfTrf, myDxfDb, true);ThisDatabase.UpdateExt(true); myDxfDb.Dispose();acTrans.Commit();ObjectId id = AcUtils.EntLast();Entity _ent = (Entity)acTrans. Get Object(id, OpenMode.ForWrite);
Is there a methoed or trick to realize a polyline is closed or not?
View 3 Replies View RelatedI've had a problem for a while now trying to extrude a 3d polyline into a 3d solid. The polyline is on different planes which is one cause of why it won't work. Instead of extruding into a solid it only does the sides making it a mesh rather than a solid. If its on one plane I know it will work.
View 2 Replies View RelatedI draw a closed polyline and then I extrude it. But when I want to see the 2d plane and hide the 3d version I cannot go back as the polylines are extruded and everything is disappearing. Should I draw a second poly over the first, then create a new layer, name it for example 3dpolywalls ? Is this the most common technique? Or there is a more efficient way ?
View 2 Replies View RelatedI have closed polyline:
Polyline rectangle = new Polyline();rectangle.AddVertexAt(0, rectangleTopLeft, 0, 0, 0);rectangle.AddVertexAt(0, rectangleBottomLeft, 0, 0, 0);rectangle. AddVertexAt(0, rectangleBottomRight, 0, 0, 0); rectangle.AddVertexAt(0, rectangleTopRight, 0, 0, 0); rectangle.Closed = true;
How can I make it like a hatch(to fill it up)?
Is there a command or lisp that will allow you to select a closed polyline and trim everything outside of it even if the items are blocks that aren’t exploded?
I’ve tried EXTRIM but that fails on blocks.
When I try to extrude this closed polyline (yes it is closed) I get the message "Cannot sweep or extrude a self-intersecting curve." I do this sort of extrusion all the time (closed polylines with various geometry) and usually have no trouble.
View 9 Replies View RelatedI've been using the admittedly pieced together code in order to insert border blocks around a closed polyline. Yhe problem I'm having is that when the Block angle is say "zero" the block is inserted the same way both on top and below the polyline. Since the blocks surround the polyline the blocks on the downside should have an additional 180 degree rotation. How to deduct that the portion of the polyline is in a certain quadrant and adjust the insertion angle as necc? I 'm not sure thats even the best approach.
Dim pso As PromptStringOptions = New PromptStringOptions("Enter name of block to create reference: ")
Dim pr As PromptResult = myEd.GetString(pso)
Dim blkName As String = pr.StringResult
'If (!bt.Has(blkName)) Then
[Code] ....
I have a method for inserting a vertex to a polyline. But this does not work for closed polylines for the case shown below. The code fails if the point is on the last edge of the polyline.
public void AddVertexOnPolyline(Point3d addPoint,Polyline editPolyline) { Document acDoc = Autodesk.AutoCAD.ApplicationServices.Core.Application.DocumentManager.MdiActiveDocu
[Code].....
Is there a way to select objects within a closed polyline? I thought there was but I can't remember how to do it.
View 2 Replies View RelatedPresently the "AREA" of a closed polyline is in "sq-in" first, THEN "sq ft".
For everything I do, and likely others, I need sq ft - without having to waste time and roll my cursor over the results.
Is there ANY way to change this default to have sq ft FIRST!??
I was wondering if there is a settings for the displayed values in a polyline's properties. Such as area. Normally it will display square feet but I would like for it to also display acres. I know it a simple conversion, but over the course of a year or more it could save me alot of time.
View 2 Replies View RelatedI need a lisp that can remove all objects (lines, polylines, blocks etc.) outside of a polyline. polyline is closed and shape is variable, so not rectangle.
View 3 Replies View RelatedI cant do booleans with polylines, for that I need to convert them to regions which I dislike because I lose edit vertex capabilities right? Also, from a region, how can I convert a region to a closed polyline in one go.
View 2 Replies View RelatedI am trying to find a command that will hatch the inner edge of a complex closed poly line, rather than hatch the entire area inside the poly line.
When I have simple shapes such as a rectangle I create a smaller rectangle inside the first that is 1' (or whatever I want my hatched area to be) smaller on all sides than the first rectangle. I hatch by selecting the two rectangles; I change the "Associative" hatch property to "No" and then delete the inner rectangle.
My problem now is that I have a complex closed poly line that I would like to hatch the inner perimeter with a set thickness, say 1 foot. Is there an easy way to hatch a inner boundary of a closed poly line or to recreate a scaled down copy of the poly line that is a set distance smaller all around. I hope I have conveyed the question clearly enough.
I can draw a closed polyline representing a closed area.
I can then toggle its 'closed' property and it seems to make no difference. area is same, I can extrude or create regions, I can hatch in either case.
in which specific situations we should bother about whether a polyline is closed or not?
I want to find the cardinal points ( N, S, E, W) of each face of a closed polyline, how?
Windows 7 (x64)
AutoCAD 2012 (x64)
I'm trying to calculate the principal moments (and section modulus) of a slection of closed polylines.
On this blog, I read that there are some new classes and functions in the AutoCad 2014 objectARX that can do this.
The one that interests me the most is 'RegionAreaProperties.PrincipalMoments Property'.
However with my limited programming skills, I can't get it to work in vb.net.
I thought is was just a property of a region, but something like 'myregion.RegionAreaProperties.PrincipalMoments' does not work.
With the code I already have I use a selectionfilter to select multiple closed polylines. I can convert these to regions if nescesary. But what is the next step? I can't find any samples of it. Not even in the Autodesk Developer's Guide.
I have linked my drawing to a database with text inside a closed polyline. Is there a way to have the area of the closed polyline stored in the database as a live area.
View 8 Replies View RelatedI drew a very complicated 2-D plot this afternoon. The most majority of the plot is composed of different straight lines, arcs. Then I used the polyline function to join them together to form a closed single polyline (Modify->object->polyline).
Later on I want to change something in part of the polyline. Then I used the 'pedit' again, I chose 'open'. But the whole polyline won't break into its original segments. I tried through all the menus, just cannot find the right tool for this purpose.
Does it mean I have to start over from scratch to redraw the whole plot?
I am a landscape architect, and am trying to use bushy linetypes to delineate blobs of mass plantings. I created my custom line types, and tweaked them to the point where they look the way i want, but whenever i have a curve the line type faces in not outside the closed polyline. all of my shapes are closed poly lines, and i need the linetype to face out other wise it looks weird. I am attaching a picture the strait line to the right is the way that it is supposed to look, but in the circle you can see how the points are all facing in to the middle of the circle? reversing the direction dose nothing, and using a or u in the place of r in the linetype shape code doesn't work either below is the line types code and image.
*Curveypines, Curvey zigzag
A,.0001,-0.0,[a,curvya.shx,s=.01,r=0.0,x=0,y=0],-.25,[b,curvyb.shx,s=.01,r=0.0,x=0,y=0],-0.0,[a,curvya.shx,s=.015,r=0.0,x=0,y=0],-.355,[b,curvyb.shx,s=.015,r=0.0,x=0,y=0],-0.0
Screen shot 2012-03-07 at 4.30.48 PM.jpg
Im wondering if exist any lisp, for erasing or selecting elements inside multiple closed polyline.
So if i have 34 closed polyline in drawing, and i wont to be erased everything inside those polyline?.
I have been using AutoCAD to create product designs (baby bottles) for the last three years. I am normally drawing lines, arcs and splines to create the shape, then I use PEDIT to create a closed polyline and REVOLVE to create a SOLID 3D object from that shape.
Couple days ago, AutoCAD is not longer creating 3D solids when I use REVOLVE as usual (even using older files and/or the same shapes or polylines that I have used before to create 3D solids). The result of REVOLVE is "SURFACE (REVOLVE)" (I got that from properties). But, the most uncommon thing is that AutoCAD is revolving fine one or two times per day after many many tries. (normally I am closing and opening files and trying to revolve some stuff many times, using the same process and suddenly it revolves the sahpe as a 3D solid)
I attached a picture showing two objects created using the same group of lines, splines and acrs. One is a solid 3d object and the other one is a surface (revolve) as result of using REVOLVE command. WHY????
I would like to select a polyline that will either be straight or contain bulges and offset lines either side of it a prescribed amount, I have tried a couple of options that don't involve picking points on both sides to no avail.
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