Apparent intersection between two objects

Hello!

It can get the apparently intersection points between two objects ?

Apparent Intersection Points.dwg

vla-intersectWith not work.

(setq lisCooIV ([color=blue]vla-intersectWith[/color] myTinV myLinV acExtendNone))

nil

I Looking for red dots !

Costin

Costinbos,

There is 3 different mode to the interwith method.

acExtendBoth would give you an apparent intersection.

Look at the following, modified from a routine by AlanJT:

;;****************************************************************************;
;; Modified from a routine by AlanJT                                          ;
;; Return list of intersection(s) between two objects                         ;
;; obj1 - first VLA-Object                                                    ;
;; obj2 - second VLA-Object                                                   ;
;; mode - intersection mode (acExtendNone acExtendThisEntity                  ;
;;                                acExtendOtherEntity acExtendBoth)           ;
;;****************************************************************************;
    
(defun Intersections (obj1 obj2 mode)
  (defun tupl3 (l) (if l (cons (list (car l) (cadr l) (caddr l))(tupl3 (cdddr l)))))
  (tupl3 (vlax-invoke obj1 'intersectwith obj2 mode))           
)

Costimbos,

You need to create a temporary polylines out of your 3dfaces, then with elevation 0, and then intersect.

Look at the TIN program for which I've sent you a link.

We do exactlly that when we label contour either dynamic or fence labelling.

ymg

So I thought and I put 0 for all elevations of '3D PolyFace Mesh', but I wonder, can there be a more direct method.

You can post the program here, because I do not have access to it there. I do not have an account ther.

Costinbos,

You should get an account there.

But here goes.

trianginprogress5.LSP

Congratulations, you did a great job! That I wanted to do. Goes well.

Try this set of data and see where it messes up:

Puncte 3D.dwg

I think it should restrict somehow not form the outer triangles.

Costinbos,

It does not mess up, what tou have is a Delaunay Triangulation.

Now if you want a Constrained Delaunay Triangulation (CDT), it does not

do it currently.

Same with Breaklines, working on it albeit slowly.

ymg

Try to add contour lines.

With this data it works very well:

Arges P-3D v 0.dwg

Do you have any idea about this?

http://www.cadtutor.net/forum/showthread.php?84486-About-PolyFaceMesh-properties-and-methods

Costimbos,

There seems to be a problem I will investigate.

Here goes with an interval of 0.2 meters.

ymg

Puncte 3D.dwg

I just mentioned to you can fix it.

Again, you did a great job. Maybe you should separate the level curves of the creating TIN. The TIN to be created and for calculation of volumes and sections (profiles).

But about #9?

im try to use in autocad 2002

Error: no function definition: ACET-UI-PROGRESS

why help me pls...

im try to use in autocad 2002

 

Error: no function definition: ACET-UI-PROGRESS

 

why help me pls...

im try to use lsp trianginprogress5.LSP‎ in autocad 2002

Error: no function definition: ACET-UI-PROGRESS:)

im try to use in autocad 2002

 

Error: no function definition: ACET-UI-PROGRESS

 

why help me pls...

Edit: Welcome to forum

Maybe 2 possibilities:

1.Sorry you are using LT?

2.normal version Express Tool Not installed in your acad?

AutoCad-Express Tool-User Interface-Progress bar

AFAIK this ACET-UI-PROGRESS is just progress bar shows at the bottom left

Removes all commands with ACET-UI -...

; (acet-ui-Progress -1)

or

try to control it :

(setq AUload (if (member "acetutil.arx" (arx)) T nil) )
. . .

(if AUload (acet-ui-Progress " Convert " i) ) ;_ end of if

but it will slow down the program execution.

many thanks Costinbos77

Command: tin

Select objects: Specify opposite corner: 30 found

Select objects:

TIN - Elapsed time: 0.1720 secs, 47 3DFACES

Command: cont

Select 3DFACES

Select objects: Specify opposite corner: 47 found

Select objects:

Error: bad argument type: numberp: nil

why i cannot make contour??

sorry bad english

yess it's finally done..

i like u all..

many many thanks

Many thanks for ymg3 that He has made available his work.

For contours sometimes give error. You must choose a different spacing.

Ask ymg3 for the latest version.

I understand that upgrading to different or new software is not always a viable option. Though in reading this thread I can't help but recommend upgrading to Civil 3D. All of the TIN, contours & volumes can be more easily completed using Civil 3D.

Just a suggestion is all. You'd be happy that you did.

regards,

Hippe013

A solution to intersecting 3d faces is that intersectwith needs to temporary turn the face into 3 lines then it will work out xyz, a bit of a sort by distance and you have your list. Using the "F" for fence option you can make a list of 3d faces to be intersected. This will work in real old versions but 2d only using "Inters" not sure when VL was added.

This is the basics of Civil software to calculate intersects of a TIN. If you use CIV3d it is a lot harder as you need to interrogate the "Surface" which is multiple triangular faces but as a single entity. Not sure were you find the answer this may be locked away in the Autodesk developers kit for CIV3D which you buy.