can multiple lines be changed to a polylines?

If i create a box in 2d,after extrude,it is a solid;but if i create 4 lines to form a box ,after extrude,it is 4 walls?is it possible ,if i have many lines,to convert mulitiples lines to polylines and i can create a solid easier?

If I remember correctly the command PEDIT can change multiple Lines to Polylines at once. You can then either continue in the PEDIT command and join them or start the command JOIN to form multiple continous Polylines.

Update: yep, just tried it and it seems to do what you are asking.

Command: pedit Select polyline or [Multiple]: m

Select objects: Specify opposite corner: 8 found

 

Select objects:

 

Convert Lines, Arcs and Splines to polylines [Yes/No]? y

 

Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype

gen/Reverse/Undo]: j

 

Join Type = Extend

Enter fuzz distance or [Jointype] : 0.1

 

6 segments added to 2 polylines

 

Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype

gen/Reverse/Undo]: *Cancel*

Welcome to the forum.

As Tiger has explained the PEDIT command will help you turn lines into polylines.

You should consider using the PRESSPULL command, it is the easiest, fastest and most intuitive way to create solids.

The PRESSPULL command will let you generate solids from lines without trimming, attaching or converting them.

It also accepts arcs and a few other object types which evade me at the moment.

Watch this very good tutorial from this site, to show you how it works.

http://www.cadtutor.net/tutorials/autocad/extrude-and-press-pull/

thank you,pedit really works!what i have been trying is a command called 'convtosolid' i have known from the help document,but i just cannot follow how to use this commmand.As i understand,after 4 walls created,use this command and select the 4 walls,it should be converted into solid,but the story is not like that...

thank you,pedit really works!what i have been trying is a command called 'convtosolid' i have known from the help document,but i just cannot follow how to use this commmand.As i understand,after 4 walls created,use this command and select the 4 walls,it should be converted into solid,but the story is not like that...

I am glad that PEDIT has helped you, but you are making this harder than it needs to be.

PRESSPULL is available in Autocad 2007, please watch the video tutorial to which I included the link in my last post.

If you don't want to watch it all, start about 3 minutes and 45 seconds into the video, which is when PRESSPULL is described and demonstrated, you will be glad you did.

You will forget all about CONVTOSOLID.

If you want proof fast? Click on the CADTutor home page link in the lower right hand corner of this page, then look for the TIP OF THE DAY for today. Seeing is believing.

Thank you,i am trying presspull now!But do you mean the convtosolid command is useless now?As i have spent days to understand this command,i want to make things clear.

Thank you,i am trying presspull now!But do you mean the convtosolid command is useless now?As i have spent days to understand this command,i want to make things clear.

If you try PRESSPULL you will see how great it is. It pretty much replaces the EXTRUDE command and a few others.

The good news is that you will understand this one right away, and it is much more useful.

In the 4 years I have been using Autocad I have never needed the CONVTOSOLID command.

Did you watch either the video tutorial or the TIP OF THE DAY to see how well it works?

When individual lines are extruded using the EXTRUDE command the result is a SURFACE. In the example of a box created with lines that you mention the only way to create a solid as you give the box height would be to use the PRESSPULL command as Dadgad has mentioned more than once.

As I understand it, and I could be wrong, the CONVTOSOLID would require a "watertight" entity. Since your box, created with surfaces via the EXTRUDE command has no top and no bottom it cannot be considered "watertight" and thus the reason why the command you were trying to use failed. CONVTOSOLID is definitely not a useless command when used with the appropriate geometry to begin with.

If you're feeling like you've spent hours and hours learning something that suddenly have gone obsolete - don't feel bad. It happens to all of us. It happens more or less every expansion that old commands have been replaced with newer, fancier commands. The good news is that in learning the CONVTOSOLID command you probably learned other things that will still be useful down the line.

Err... expansion? I meant version

I would argue that the CONVTOSOLID command is not obsolete at all. Just because the command failed doesn't mean it is obsolete. The failure, as it were, could be attributed to the geometry that is being used or the fact that the user did not understand or follow the command prompts.

Box one was created using lines. It was then given a height using the EXTRUDE command. The result is a four sided box (open inside) comprised entirely of surfaces.

Box two was created using a continuous polyline. It was given a height using the EXTRUDE command. The result is a solid through and through. Slicing the box in half would confirm the fact.

Box three was constructed from four lines but instead of using the EXTRUDE command the PRESSPULL command was used. The result is a solid. This can be confirmed either via the Properties palette or as I have shown here (box four) slicing the box in half.

I would argue that the CONVTOSOLID command is not obsolete at all. Just because the command failed doesn't mean it is obsolete. The failure, as it were, could be attributed to the geometry that is being used or the fact that the user did not understand or follow the command prompts.

Has SURFSCULPT stolen some of CONVTOSOLID's thunder?

An honest question, having not used either one.

in learning the CONVTOSOLID command you probably learned other things that will still be useful down the line.

yeah, like PRESSPULL!

Note that meshes can be converted to solids using CONVTOSOLID.

I would agree that SURFSCULPT would probably be of more use to the OP as long as he was working with the proper geometry.

An example of a mesh cube (number 5) converted to a solid (number 6) using the CONVTOSOLID command.

A six-sided box constructed entirely of surfaces.

>

The same box (number eight) after its conversion to a solid using SURFSCULPT. Number nine is the result of using the SLICE command to cut the box in half. Solid through and through.

[ATTACH=CONFIG]35650[/ATTACH]

 

A six-sided box constructed entirely of surfaces.

 

>[ATTACH=CONFIG]35651[/ATTACH]

 

The same box (number eight) after its conversion to a solid using SURFSCULPT. Number nine is the result of using the SLICE command to cut the box in half. Solid through and through.

I'm guessing you took my advice about hooking up the IV ITALIAN ROAST drip yesterday, that or you slept a lot better last night, firing on all cylinders today!

Seven out of eight cylinders are cranking along. I'll be working on the eighth in just a couple of minutes. Coffee break time!