topic Re: IGS LinearWire simulation issues in Maya Forum

IGS LinearWire simulation issues

Giovanikc — Thu, 17 May 2018 18:51:56 GMT

Hey guys! Hope some of you enlight me about an issue I'm facing regarding to IGS. I did I quick search on the forum but Ican't find nothing specific about this.

The sim works pretty well using LinearWires but I can't make the hair interpolation looks good. Sometimes the hair looks jagged and some tips seems to stretch even if I change the magnitude scale.

How can I fix this?

Thanks in advance.

Re: IGS LinearWire simulation issues

sean.heasley — Fri, 18 May 2018 15:00:12 GMT

Hi @Giovanikc and welcome to the community!

It looks like you may have missed a few steps with setting up these wires.

I'd recommend checking out this workflow video for IGS and apply it to that scene file!

Please let me know if anything changes!

Re: IGS LinearWire simulation issues

sean.heasley — Mon, 21 May 2018 17:29:04 GMT

Hi @Giovanikc

I'm just checking in again to see if you need more help with this. Did the video I provided on Friday help you at all?

If so, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: IGS LinearWire simulation issues

Giovanikc — Wed, 23 May 2018 23:16:39 GMT

Thanks for the feedback Sean! I still looking for a solution to this issue.

Re: IGS LinearWire simulation issues

sean.heasley — Thu, 24 May 2018 17:39:40 GMT

Hi @Giovanikc

Did you have a chance to watch the video I provided?

It shows an in depth proper workflow for what you're trying to achieve.

Re: IGS LinearWire simulation issues

Giovanikc — Thu, 24 May 2018 18:42:39 GMT

Hey @sean.heasley! Sure, I follow the steps shown in that video but some hairs seem to stick in place. I'll provide you with my test scene.

Thanks in advance.

Re: IGS LinearWire simulation issues

sean.heasley — Fri, 25 May 2018 17:49:09 GMT

Hi @Giovanikc

Thanks for attaching the file!

It looks like an issue with your groom but it also looks similar to an issue in this thread.

The solution from that thread was:

"Ok.

First, no, a clump modifier is not needed but I think you need some more info on what the conversion actually does.

When you convert a groom to Interactive Groom Splines, it bakes out the final result to primitives. It does NOT bake out density maps or modifiers, just the pure geometry of the final result is converted.

This will likely mean that you're linear wire modifier has guides all over the surface, not just in the area where the primitives are. If you were using desnity maps in XGen, you will need to recreate them in IGS to drive the guide placements. Any Clump modifiers will also be affected by this as clumps will be generated across the whole surface.

Another factor to bear in mind with conversion is that the density masking and multiplier on the converted grooms base node will not work as the hairs are not being generated by the base node, but are the baked result of the the XGen groom.

You can however, use the converted groom as an Interpolation source for a new, empty groom that will then be able to use the density maps and multiplier.

Groom Transfer Interpolation"

Please let me know if this information helps!

Re: IGS LinearWire simulation issues

Giovanikc — Sat, 26 May 2018 18:02:01 GMT

Thanks @sean.heasley That issue looks pretty similar. I tried the same steps @Michael_Todd shown but that issue persist. I'm still tring figure out what is going on.

Cheers.

Re: IGS LinearWire simulation issues

sean.heasley — Tue, 29 May 2018 16:03:17 GMT

Hi @Giovanikc

Its most likely due to how the groom was done.

When you get a chance, can you possibly post a video of how you made this groom so I can see if you missed any steps?

If you need a video capturing program, Screencast is a great option that we use here at Autodesk

Please let me know if anything changes!

Re: IGS LinearWire simulation issues

Giovanikc — Wed, 30 May 2018 00:07:54 GMT

Thank you @sean.heasley here is the video and the file.

Re: IGS LinearWire simulation issues

Giovanikc — Wed, 30 May 2018 00:11:30 GMT

The scene file.

Re: IGS LinearWire simulation issues

sean.heasley — Wed, 30 May 2018 18:30:01 GMT

Hi @Giovanikc

Thanks a ton for posting that video with your repro steps!

I believe this may be an issue with IGS so I passed this along to our dev team to look into and let me know if this is a known issue or if we missed a step somewhere.

I'll update this thread as soon as I have more information or steps to try.

Re: IGS LinearWire simulation issues

sean.heasley — Thu, 31 May 2018 18:10:52 GMT

Hi @Giovanikc

This does indeed look like an issue with Xgen that shouldn't be happening normally.

The dev team now knows this and they'll be working on a fix for a future update/version of Maya!

Please let me know if there's anything else I can do to help!

Re: IGS LinearWire simulation issues

Giovanikc — Fri, 01 Jun 2018 16:22:26 GMT

Thank you @sean.heasley!

What a pity, we are trying to introduce IGS to our animation pipeline... so who knows maybe next time.

Re: IGS LinearWire simulation issues

Michael_Todd — Thu, 21 Jun 2018 20:17:48 GMT

Actually, I think the issue is down to the fact that you are using a linear wire modifier on top of sculpted hairs ON TOP of guides.

Sculpting the hairs to such an extent over the shaping of the guides is causing a disconnect. As the hairs are now so far from the guide influence, the interpolation is producing unpredictable results.

I'd recommend NOT sculpting the hairs to such an extent that the guides are no longer anywhere close to the hairs they are 'guiding'

You can either sculpt the guides directly to create the overall shape and then sculpt the hairs for fine detail, or you can groom the hairs directly to create the overall shape THEN add guides and make those dynamic. The Guide modifier also has the ability to control interpolation whereas the linear wire modifier does not, it acts purely as a deformer.

Re: IGS LinearWire simulation issues

Giovanikc — Fri, 22 Jun 2018 21:37:01 GMT

Thanks for your feedback @Michael_Todd!

Re: IGS LinearWire simulation issues

gaoshang1244 — Wed, 02 Nov 2022 08:15:38 GMT

Hi, I also have this issue. did you solve that problem? BUT I tried to use maya2022 also has this issue...

Re: IGS LinearWire simulation issues

gaoshang1244 — Wed, 02 Nov 2022 08:15:52 GMT

Hi, I also have this issue. did you solve that problem? BUT I tried to use maya2022 also has this issue...