Load an original fold model
See this course’s project requirements
An original accordion fold study with three SVG variants, checked geometry, target-angle comparisons and an honest simulation or paper-model record.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- An original four-panel pattern with M/V assignments and checked dimensions.
- A three-state partial-fold log or labeled paper-state sketches.
- A comparison of 90-degree and 45-degree targets.
- A width revision from 120 to 160 coordinate units.
- Original input files, comparison notes and simulation exports or paper-model descriptions.
Review and revise
Use these criteria to check your work and choose what to improve.
- Crease assignments and panel geometry match the specifications.
- Target-angle calculations are correct.
- Controlled comparisons identify what changed.
- The method and limits are stated accurately.
Want more background?
The idea in everyday life
Use accordion-fixture.html Pattern A. The SVG has a black rectangular boundary, red creases at 30 and 90, blue crease at 60, and opacity 0.5 on all creases. The hosted simulator is free to use without an account.
An importer reads both geometry and attributes; a visually similar color can encode the wrong operation.
Load an original fold model — guided practice
Import a known crease pattern and check that its meaning survives.
Use accordion-fixture.html Pattern A. The SVG has a black rectangular boundary, red creases at 30 and 90, blue crease at 60, and opacity 0.5 on all creases. The hosted simulator is free to use without an account.
1. Download the original pattern
In the local fixture select A and click Download SVG. Save accordion-A.svg. If downloading is blocked, open SVG text for manual saving, copy the text into a plain-text editor and save as accordion-A.svg using All files rather than adding .txt.
You should see: A small self-contained SVG contains the original pattern.
The exact stroke colors and opacities carry fold instructions.
2. Import into the simulator
Open origamisimulator.org on a desktop browser. Use File > Import to choose accordion-A.svg, or drag the SVG onto the app if its import target is shown. In SVG Import Settings leave curves unchecked and confirm Import SVG.
You should see: The app loads a four-panel sheet with three straight creases.
This fixture uses straight geometry, so curved-fold processing is unnecessary.
3. Inspect before folding
Set Fold Percent to 0. Open Pattern view in the top navigation and check the boundary and three assignments. If a line is missing, inspect the downloaded SVG text for its stroke and endpoints before reimporting.
You should see: The imported flat geometry matches A.
A pattern error should be repaired before adjusting simulation settings.
4. Use the supported fallback
If the app reports unsupported GPU functions, keep the local preview and use the paper route: mark four equal panels, fold the two outer creases as ridges and the middle as a trough. Record that you used a paper model rather than a numerical simulation.
You should see: The study can continue with the same crease counts and assignments.
A documented alternative is more useful than claiming a blocked simulation ran.
What to finish
An imported checked pattern or an explicitly documented paper model.
Watch for this
Changing colors without realizing they encode fold types.
How can I tell I understand it?
Explain the result, reproduce the procedure, and complete the changed-input check.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
You’ll get an explanation for each answer. Signed in? Your results save to your account.
Pass the check. We’ll save the progress.
Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
Class 1: Overview for MIT 6.849 Geometric Folding Algorithms: Linkages, Origami, Polyhedra
From MIT OpenCourseWare. Watch here or open it on YouTube .
Optional course overview. Follow the written steps below at your own pace.Tools, templates, and lesson sources
Tools and templates
Tools open in a new tab so you can keep your place here.
Sources and further reading
Explore the references behind this lesson.
Source & access notes · checked 2026-09-12
Read Fold Percent, SVG stroke/opacity rules, import, pattern view, strain explanation and export controls. WebGL simulation was not operated.
Access: Public reading without a paid account; reviewed September 12, 2026.
Reuse: Link only. Lessons and practice assets are original; free access does not grant permission to copy the provider's material.
Source & access notes · checked 2026-09-12
Read original project description, simultaneous-fold solver, constraints, SVG/FOLD input and GPU method.
Access: Public reading without a paid account; reviewed September 12, 2026.
Reuse: Link only. Lessons and practice assets are original; free access does not grant permission to copy the provider's material.
Source & access notes · checked 2026-09-12
Read original project README, supported inputs and MIT license declaration.
Access: Public reading without a paid account; reviewed September 12, 2026.
Reuse: The simulator repository declares MIT licensing. This course links to the hosted tool and supplies an independently written crease generator; no third-party patterns or source files are copied.
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