Hi

I've been trying different solutions for a couple of days, but nothing works completely. My original geometry doesn't have clean, nicely ordered point numbers, so when I extract an edge loop using the disolve SOP the points are randomly ordered and it's tough to process them afterwards.

Firstly, I need to extract two parallel edge loops out of a pipe-like geo and bridge them to form a single-sided tape that I can run through sims. Besides the point ordering issue, whenever I extract the edge loops (which appear to be valid polygon curves) I find that they have twice as many vertexes as points :shock:. There's no operation I can do to fix that and even the clean SOP doesn't do the job properly, it always invisibly breaks the “curve” and I can't loft the curves properly.

I'm open for new ideas at this point, as long as I don't have to use the HDK…

Cheers

sort it by vertex order and use good old Add SOP to recreate curve

tamte
sort it by vertex order and use good old Add SOP to recreate curve

Thanks, Tamte, although I have tried that and it didn't really work cause of the intrinsically messed up geometry that I have to work with. when I try to sort by vertex it still doesn't work as I would expect…

I'm posting a piece of the geo, in case you have a chance to look at it.

Cheers

rafaels
Thanks, Tamte, although I have tried that and it didn't really work cause of the intrinsically messed up geometry that I have to work with. when I try to sort by vertex it still doesn't work as I would expect…

I'm posting a piece of the geo, in case you have a chance to look at it.

If its always going to be a Tube shape then just use a MatchTopology SOP ahead of time to sort the points into a reasonable order, then you can use all sorts of lovely SOPs to get an edge loop.

Cool! Here's one SOP I've never known existed. ops:
It solves 99% of my problems now…

Thanks

rafaels
Cool! Here's one SOP I've never known existed. ops:
It solves 99% of my problems now…

Thanks

Coincidentally the FX team here used this same technique last week to solve a similar problem, I attached the setup into your file.

I'm not completely certain what your topology looks like, but I've fixed tube-like point orders by applying a cylindrical uvtexture and then putting $MAPU in Sort SOP's expression field.

For nasty cases you might lay down a spline, sweep a circle or use polywire, transfer UVs, and do the above. Maybe with some raying for good measure

edit: ohh, I missed a lot of replies :)

rafaels
..

I'm posting a piece of the geo, in case you have a chance to look at it.

..

the attached file doesnt seem to have any geo ‘data’ inside .. even Locked .

Wolfwood
Coincidentally the FX team here used this same technique last week to solve a similar problem, I attached the setup into your file.

Now I know…

Cheers

zarti

rafaels
..

I'm posting a piece of the geo, in case you have a chance to look at it.

..

the attached file doesnt seem to have any geo ‘data’ inside .. even Locked .

Its a Houdini 12.0 file, so if you are trying to open it in H11 that might be the problem.

But if you are in 12.0 I have no idea.

Wolfwood

zarti

rafaels
..

I'm posting a piece of the geo, in case you have a chance to look at it.

..

the attached file doesnt seem to have any geo ‘data’ inside .. even Locked .

Its a Houdini 12.0 file, so if you are trying to open it in H11 that might be the problem.

But if you are in 12.0 I have no idea.

yep , i thought that too , after downloading your file .

anyway , something like that shoudnt happen ..




.cheers