Index of a vertex

[frenchquacky]

Hello,
i need to access the index of a vertex in a vertex list of a body.
example : body.vtx[3056]
i need the 3056.
Is there another solution than parsink and tokenizing the string ? i didint find mel command for this
thanks for help.

[warpcat]

string $string = "body.vtx[3056]";
int $vertexId = match "[0-9]+" $string;
// Result: 3056 //

[jeffd]

That's pretty clever, Warpcat!

Lately, it seems like there have been a lot of question in which posters are trying to get out of tokenizing strings. I wonder why...

--JeffD

[warpcat]

not unlike your suggestion of the "substitute and substituteAllString " on that other post. We share, we learn

[campbell]

heya, and for the cases where you might have numerics in the obj name:

eg. body24.vtx[3056]

{
string $string = "body24.vtx[334]";
$compId = eval(" match "[0-9]+" match "[0-9]+]$" " + $string +"");
print $compId;
}

been trying to do it w one match, but how? - a stupid challenge, who can crack it?

[frenchquacky]

I s there only such solution with string matching???
if i have an object with body230body230.vtx[8] i will have some problem....
I can believe that there s no mel command to obtain the index of a vertex in the vertex list of a shape....
however, thanks for help

[frenchquacky]

I already have something with string matching :

http://www.ewertb.com/maya/mel/mel\_a72.html

proc int[] componentRange( string $select )
{
string $buffer[];
int $i, $tokens;
int $elements[2] = { 0, 0 };

$tokens = tokenize $select "[:]" $buffer;

$elements[0] = $elements[1] = int($buffer[1]);

if ( $tokens > 2 )
$elements[1] = int($buffer[2]);

return $elements;
}

but i m searching for something more robust you know

[campbell]

In reply to: if i have an object with body230body230.vtx[8] i will have some problem....

my method above wont have problem w this ... which is a (~)one line soln to strip it out rather than a whole proc.

perhaps the qn is, not why isnt there a command to list just id, but why do you want just the index? - when most often to do anything w that index, you have to present it in the same format you ripped it from. perhaps you restructure your code so you dont have to strip out, then rebuild the component string. depends on what your doing really!

bryan's proc you present is giving you start and end components of a non-flattened component range, not sure why you posted that (no string matching in there, btw) ...perhaps you might like to look at the -fl, flatten, flag for listing?

[joojaa]

Wha i use is split with [] thisway i can read the last index of the returned array... But thats not the most efficient way!

[frenchquacky]

I need to have the index of the vertex because i need to export a selection in Obj format. You will say . "hey there s an obj exporter in maya!!! you can export all or just selection..."
But what the mean by "selection" is : the object selection! so if i select only 1 face, it will export the whole object this face belongs to.
And i would need only this face!
So i rewrite an obj exporter. and for this, you need to remap an index list of vertices from the face list you have selected. To have some efficiency, you can use the index of each vertex in this face list (of course, i use ls -flatten to obtain face list and vertices list...).
If you dont have this index you must compare each vertex string in the vertice list you obtain for each face... this could be long if you have a big object.
i dont know if i m understandable...
I dont know if there s another easier solution, but that s why i post this message

[joojaa]

Wouldnt it be easier to duplicate the face to a different object and export that object instead? Would save alot of hustle.

[frenchquacky]

Good idea , but doesnt work.....
because duplicate can only duplicate a whole object!

[joojaa]

Yeah i wasnt meaning that you literaly use tha copy command... I can think of atleast 6 ways of doing this even if i didnt know thares a command for it. Its real frustrating to solve problems for people who want it all handed out for them sometimes... but this ones easy.

edit polygons duplicate faces with separate on!

[frenchquacky]

I dond want you to solve my problem, if you dont want!
I already solve this problem of export.... I export a selection of object/ point or face to obj file for a range of the animation.
But i dont like my method to find vertice index ...
Your solution to make the export is another solution...
if you want to leave the scene unchanged, you must duplicate and delete your obj...if you have a big object it could be long... and i do it for each step of an animation...
i was question about my initial motivation of finding vertice index...so i answer. Dont think i m searching someone to solve all my problem
I m searching for a simple Mel command to achieve this search of index. that s all.

[joojaa]

Well not meaning you per se... i mean that there are lot of users that dont even know the basic commands... then how could they be helped.

in general im being general!

[frenchquacky]

I tried your solution too, but this duplication command duplicate all faces as single face. There s no ling between vertex anymore...
with big object, it s very slow...

[joojaa]

umm works fine for me ona 10,000 poly object! Anyway the operation should have history (didnt test), so it should update as the object deforms so no need to copy multiple times, i should test but no maya at hand