Hi dune1982, for that case select your main curve and all the lines that cross it and use the Construct > Curve > Isect command to intersect them. That will generate a point object at each intersection and you can then select all points either with a strategically placed selection window or by using the Types > Points entry in the Scene Browser, then export them.

- Michael

How to redraw a curve by these points selected on the screen? (except by hand of course)
I have a black hole of memory! A command, script, plugin... ?

Hi Pilou,

if i remember correctly Franz asked for this feature a while ago,
because it is not possible currently. I would like to have this
possibilty too.

Regards
Stefan

Hi Pilou & Stefan, after writing the points out to the file you can use the ImportPointFile script at the same link above to do that:
http://moi3d.com/forum/display.php?webtag=MOI&msg=5124.2

It has an option for how to process the imported points, you can make point objects out of them, a polyline, a control point curve or an interpolated curve. The ordering of the points in the file is significant though.

- Michael

Thank you Michael, the isect command works just fine.

Ok now I have to make a script that will creates trose 500 hundret lines with a distance based on the length of the initial curve. Then automaticaly select the curves and run the isect command. Then export the stuff to a file.

Sounds like it is possible but I nearly lost all my scripting skills over the years.

< ImportPointFile script

Ok that was that! the funny is that we must export then import! :)

Hi dune1982, you can just do those steps that you describe individually, for getting the length of a curve use this:
http://kyticka.webzdarma.cz/3d/moi/#CurveLength

You can decide what length to use based on that, then with the regular Transform > Array > Dir command you can make 500 lines with the spacing you need, you can select all the lines that were just created using this on a shortcut key:
script: moi.geometryDatabase.selectLastCreated();

Then run isect and that SavePointFile plug-in.

Why do you need to combine that into a single script?

- Michael

Hi Michael,

thanks a lot! I completely forgot that this is possible with the import script.

Regards
Stefan

Since I have to do this task couple of times now and in the future a script would make it easier.

I already got this far (create some lines and put them in a list, but I fail selecting the one line where all the intersections are on)

#include "GetObjects.js"

//Set vareables 
var i;
i=0;
var linelength;
linelength=50;

var linelist = moi.geometryDatabase.createObjectList();


//Will draw a line with the given coordinates 
function drawLine(x1,x2,y1,y2) 
{
   	var linefactory = moi.command.createFactory( "line" );
   	linefactory.setInput( 0, moi.vectorMath.createPoint( x1, y1, 0 ) );
   	linefactory.setInput( 1, moi.vectorMath.createPoint( x2, y2, 0 ) );
	    
	var objlist = linefactory.calculate();
   	var line = objlist.item(0);
	moi.geometryDatabase.addObject( line );
   	return line;
}	


for ( var j=0; j < 17; j++ )
{
	linelist.addObject(drawLine(i,i,0,linelength));
	i=i+10;
}
//works fine until here

	

//Will do the intersection 
function DoIntersect()
{
	
	var objectpicker = moi.ui.createObjectPicker();
	//objectpicker.min = 2;
	
	if ( !GetObjects( objectpicker ) )
		return;
	linelist.addObject(objectpicker);
	
	var factory = moi.command.createFactory( 'intersect' );
	factory.setInput( 0, linelist.objects );
	
	factory.commit();
}

DoIntersect();

for the corresponding .htm file I just copied the content of the intersect.htm

It works so far that MoI asks me to pick objects for the intersection. I assume that the lines created by the scipt are in the linelist, so I just select the one line that crosses all the created lines. But that fails in the errormessage attached

Hi Dune1982,
It seems that you have not posted the code which includes the variable allownothing?
- Brian

Hello Brian,
that is part of getobjects.js wich is a part of the MoI core files.

Hi dune1982, it looks like the error report is off, the actual error is 2 lines down from GetObjects(), here:

linelist.addObject(objectpicker);

ObjectList.addObject() expects a geomobject while that is passing an objectpicker instead. Also further down for the setInput call I think you need to pass just linelist since it is an objectlist, linelist.objects would be an error.

So something like this:

//Will do the intersection 
function DoIntersect()
{
	
	var objectpicker = moi.ui.createObjectPicker();
	//objectpicker.min = 2;
	
	if ( !GetObjects( objectpicker ) )
	    return;

	var picked_objects = objectpicker.objects;

	for ( var i = 0; i < picked_objects.length; ++i )
	    linelist.addObject( picked_objects.item(i) );
	
	var factory = moi.command.createFactory( 'intersect' );
	factory.setInput( 0, linelist );
	
	factory.commit();
}

DoIntersect();

Hello all, Michael,

Does this SavePointFile script still work for V4, and if yes, where does it write out the file ? I am not getting any prompt for a save location and can't seem to find any .txt file written out.

For context I am currently working on a small DIY project that would require to export out points data from a MOI drawing, to later plot them physically as straight pen lines between each point, in "turtle" fashion, using a small Arduino robot. And while an OBJ export of filled polygon objects seems like a good starting point as it is very human readable, I have been wondering if there is already a way to write out point data (in good order of course) to CSV, which led me to this thread.

[edit] Just found this other thread here where it is mentioned that the script is intended to work on point objects, rather than points from objects.
http://moi3d.com/forum/lmessages.php?webtag=MOI&msg=8996.2
It is giving me a long series of floats, separated by commas. I suppose that they are to be interpreted as X0,Y0,X1,Y1,X2,Y2... and so on ? I suppose the order is maintained from the original object ?

Hi pior,

re:
> It is giving me a long series of floats, separated by commas. I suppose that they are to be interpreted as X0,Y0,X1,Y1,X2,Y2... and so on ?

It should be making a separate line in the text file for every point with an x,y,z value on every line.

Can you please post an example output file where it's all on one line?

Are you using the version from here? :
http://moi3d.com/forum/index.php?webtag=MOI&msg=5124.2


> I suppose the order is maintained from the original object ?

It's going to be in the same order that the point objects are in the geometry database.

- Michael

Hello Michael, thank you for the support as always.

FWIW here is what I am getting when running SavePointFile (most updated version) on 4 points which have been copied from a square shape, drawn in top view (first screenshot). It looks like the line breaks have been ignored altogether somehow ? Whereas the OBJ data for the same shape planar filled before obj export is organized more as expected (second screenshot). I'm on Windows btw.

Hi pior, if you're using Windows notepad the problem is that it doesn't recognize unix-style newline only line endings.

Try with a more fully functional text editor like notepad++.

- Michael

I see - and I had the answer right there in front of me as it was just a matter of opening that txt in Sublime just like I did with the OBJ. And indeed opening the .txt in it does recognize the lines/structure.

Interestingly enough opening the .txt in some programs that respect the CSV structure and resaving from there seems to generate a .txt that has lines in notepad while still being a clean CSV. So perhaps it could be possible to write out a structure that does both ? But of course not at the cost of doubling the line breaks.

On a related topic : is there a feature in MOI that would convert shapes (with lines, polylines and curves) to segmented shapes, similarly to what the DXF exporter does to shapes and the OBJ exporter does to filled shapes ? The point (!) being to have points that can still describe the curved elements accurately, without resampling the straight lines. A "convert to polygon" feature of sorts :

Hi pior,

re:
> So perhaps it could be possible to write out a structure that does both ?

Currently there isn't any way to adjust the line endings in MoI's text file output to MS-DOS style but it would not be hard to add in an option for that in the future once v5 betas are underway. For now to get that you would need to open and resave it in a text editor that allows you to control the line endings.

re:
> On a related topic : is there a feature in MOI that would convert shapes (with lines, polylines and curves)
> to segmented shapes, similarly to what the DXF exporter does to shapes and the OBJ exporter does to
> filled shapes ?

You could use the DXF exporter for this purpose, save out to DXF format, with Export type = "3D Curves", and Write curves as "Polylines". Then read the DXF file back into MoI. That should convert curves into segmented lines.

- Michael

All noted - and indeed, the DXF route sounds rock solid. Thanks again !

By the way, I have another question related to this topic of writing out points data.

Is there any way to control, or at least visualize, the ordering of the points within a shape object ? By that I mean being able to see which point is first and which is last, and flipping this around if needed.
Or, if not possible, is there some clever workaround to force the ordering one way or another ? Like for instance fusing curves in a given order, forcing a recalculation with a trim, and so on.