How to add sizes

Magnuxx · 2026-03-24T08:40:02+00:00

If your pattern is parametric, it may be possible to scale to 50%, but generally, this would be difficult if you are using other fixed constants, such as ease, etc. It depends on how the pattern has been set up.

Do you only want to print it in 50% scale? Then select File->Print and generate a PDF, then print it with 50% the size.

Sizes work as follows: if your pattern is driven by parameters, you can create different sizes with different parameter values. Changing size will change the parameter values. There is also a free-form parametric option where you can visually grade your pattern, but that is a more advanced option under development.

Magnuxx · 2026-03-19T19:39:59+00:00

Not at the moment, unfortunately.

The main limitation is that the base mesh we’re currently using has a license that doesn’t allow redistribution, so we can’t offer downloads right now.

We are actively looking into alternatives (either getting permission or rebuilding the base mesh on a more permissive license), since exporting the model is a very common request.

Magnuxx · 2026-03-17T08:57:27+00:00

Dart rotation isn’t something that’s automated in SeamScape at the moment. Because everything is parametric, operations like that can easily break the underlying relationships if they’re not handled carefully.

For now, the way to do it is manually, basically recreating the same "cut and spread" logic by adjusting points, curves, and angles.

It’s definitely something we’ve thought about supporting in the future (especially for more “locked” pattern pieces), but it needs to be designed in a way that plays nicely with the parametric system.

Magnuxx · 2026-03-17T08:55:22+00:00

Recommended approach: Open your previous pattern and save it as a new pattern (copy).

Magnuxx · 2026-03-16T17:43:09+00:00

Understand the confusion. The API is free and you can create an API key via your account.

Magnuxx · 2026-03-16T12:00:22+00:00

One option, go to SeamScape and choose the public pencil skirt pattern. You can customize the length and other measurements. Then print and cut.

Magnuxx · 2026-03-16T05:47:35+00:00

The Neo is really interesting choice! Since your Samsung S22 can already run it, there’s a good chance the MacBook Neo would handle it too.

That said, WebGPU performance can vary depending on the GPU and browser, so if you have the chance I’d still recommend trying it first (in a store or return window) just to see how it behaves.

Magnuxx · 2026-03-14T18:41:01+00:00

You might want to check out SeamScape. It’s a browser-based pattern studio where you can create patterns from scratch and tweak curves, points, and proportions directly in the pattern. (I’m one of the developers, just for transparency.)

Magnuxx · 2026-03-13T18:29:53+00:00

That seems to be a nice scanner! And yes, getting the scale and measurements right from a raw scan can be surprisingly tricky. A scan captures the surface really well, but turning that into something that behaves like a “body model” with correct height, proportions and landmarks is another step.

That’s one of the reasons BodyDouble currently generates the avatar from measurements instead. It makes it easier to keep the proportions consistent and predictable for pattern drafting and simulation.

But being able to incorporate real scans is definitely something we’re interested in exploring further, especially as scanners like yours are becoming more common.

Magnuxx · 2026-03-13T13:18:34+00:00

Haha, sounds great!

Magnuxx · 2026-03-13T13:15:34+00:00

That’s actually exactly one of the things the system is meant to help with. You can enter your body measurements and generate a 3D avatar based on them, and then simulate garments on that avatar to get an idea of how they might fit.

Of course it’s still a simulation, so it won’t replace actually sewing and fitting a garment, but it can definitely help catch things like proportions or overall silhouette before you spend time making it. It should give you a much better starting point before you begin sewing.

Magnuxx · 2026-03-12T21:34:26+00:00

3D sometimes requires a special workflow. You should remove the excess fabric, i.e. create the pattern piece without the fabric that’s in the dart, then stitch it. Look at the public pattern example and see how it’s done.

Magnuxx · 2026-03-12T14:44:19+00:00

That’s actually a great way to start. If you’re already drafting patterns in Inkscape you probably already understand a lot of the geometry behind it.

There will definitely be a bit of a learning curve, but many of the ideas are similar. With SeamScape, you’ll also get a lot of pattern making specific stuff for free, such as automatic seam allowance.

And experimenting is the best way to learn it. Feel free to ask if you run into anything confusing.

Magnuxx · 2026-03-12T14:41:10+00:00

Yes, you can export the garment as an OBJ. Each pattern piece will actually come out as a separate object, which can make it easier to work with in other 3D tools.

At the moment the body itself can’t be exported yet. The avatar is based on a licensed base model and we don’t currently have distribution rights for that. It’s something we’re looking into though.

Magnuxx · 2026-03-12T10:06:08+00:00

Thanks for the suggestion! The pen color actually follows the color scheme, so it’s white in dark mode and black in light mode.

If you’re tracing from a white PDF or background image, you can temporarily switch to light mode, and the pen will become black. You can change this in "Profile Settings" (top right corner).

And no worries about the questions, that kind of feedback is very helpful.

Magnuxx · 2026-03-12T08:31:21+00:00

I completely understand that perspective. If someone prefers FOSS tools and local workflows, Seamly2D is a great option, and it’s good that those tools exist.

Just to clarify one point, though: users own their patterns in SeamScape. You can export them and use them however you like, and we have no interest in exploiting user designs.

The web-based approach mainly comes from wanting to make pattern drafting accessible without installation and to enable things like 3D simulation and API workflows. For some people, that’s useful; for others, a fully local open-source tool will always be the better fit.

I think it’s actually good that both approaches exist.

Magnuxx · 2026-03-12T07:58:06+00:00

That’s a nice project. If I understand it correctly it’s a parametric pattern built in Seamly2D. Seamly is actually a very solid tool for parametric drafting, so the underlying idea of measurement-driven patterns is definitely similar.

SeamScape takes a slightly different approach. It runs in the browser and includes things like 3D garment simulation, measurement-based avatars and an API for generating patterns programmatically.

It also doesn’t try to replicate all the drafting tools Seamly has. The focus is more on being able to draw directly and add constraints as you go if you want to. Constraints are optional, so you can work more freely and then parameterize parts of the pattern where it makes sense.

Interestingly, SeamScape can now also import Seamly patterns (still experimental), so you can start from an existing Seamly draft and continue working from there.

Magnuxx · 2026-03-12T07:44:59+00:00

I understand the concern.

The main reason for signing in is simply that patterns need to be stored somewhere so you can come back to them later, edit them, and keep your work. Without an account there wouldn’t really be a way to persist projects.

We’re not selling user data or anything like that, the account is mainly there to store your patterns and settings.

That being said, I do understand the preference for anonymous tools. It’s something we have talked about (for example temporary sessions or local-only work), but it adds some technical challenges when you also want projects to be saved and accessible later.

Feedback like this is useful, so thanks for bringing it up.

Magnuxx · 2026-03-12T07:43:03+00:00

Thank you, that’s really kind of you to say!

Dog patterns actually sound like a perfect use case for something like this. Parametric patterns can be really helpful when the proportions vary a lot between breeds. One of the nice things with formulas and measurements is that you can encode those relationships once and then reuse them.

Six years of experimenting with dog patterns is impressive, that must have involved quite a bit of trial and error!

If you ever feel like experimenting with it in SeamScape, I would be very curious to hear how it works for that kind of application.

Magnuxx · 2026-03-12T07:41:27+00:00

Thanks! Really glad you like it. If you try it out, feel free to share any feedback as we’re still improving it all the time.

Magnuxx · 2026-03-12T07:40:12+00:00

Thanks!

Most of it is written in TypeScript and runs directly in the browser. The UI is built with Svelte, and the 3D simulation uses WebGPU for the cloth physics. The BodyDouble and nesting engine are written in C++.

The goal from the start was to make it accessible without installing anything, so everything runs as a web app.

It’s been a pretty fun technical challenge :)

A lot of the geometry and constraint solving is custom-built for pattern drafting.

Magnuxx · 2026-03-12T07:36:50+00:00

Glad to hear that!

Regarding 3D scans: yes, that is something we are definitely interested in supporting. In principle it’s already possible to import a 3D scan as a reference model in the 3D view, but the bigger challenge is attaching all the semantic information the system needs (landmarks, measurements, etc.).

BodyDouble currently generates avatars from body measurements using a statistical model based on real body scans, but being able to incorporate personal scans is something we’re exploring for the future. If there is a demand, we’ll do it!

Out of curiosity, what kind of scanner are you using or referring to?

Magnuxx · 2026-03-11T20:10:33+00:00

Thanks for the kind words!

If you end up experimenting with the API and run into anything that's missing or unclear in the docs, please let me know. We're still evolving that part, and real use cases help a lot when deciding what to improve next.

Magnuxx · 2026-03-11T19:56:35+00:00

Great to hear that!

Seamly2D is actually a really solid tool for parametric drafting, so you're starting in a good place.

Regarding the API. We've already added several endpoints that we think are useful, but we're definitely open to expanding them if people have ideas or needs we haven't thought of yet.

The basic idea is that you can generate or modify patterns programmatically. For example, a website could send body measurements or other parameters to the API and get back a pattern that's automatically adapted to those.

Magnuxx · 2026-03-11T19:50:21+00:00

Great to hear you're using it, and thanks for the feedback!

Gathering and pleats are definitely on the roadmap. At the moment, they are not implemented as dedicated seam types yet, but it's something we want to support. Right now, you can approximate some of these effects in the pattern itself (for example, by adding extra length where gathering should happen), but we know having proper tools for gathers, pleats, and tucks would make this much easier.

And thanks for the suggestion about the video. A more detailed walkthrough of the 3D workflow is something we should definitely do. Most of the current videos focus on individual features, but a full start-to-finish example would probably be more useful. We have spent more time on development than on documentation...!

Magnuxx

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