# Season 1 Challenge #2 is DONE | Parametric Sketching 2/5
**URL:** https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185
**Category:** Season 1 - Parametric Sketching
**Created:** [July 6, 2026, 12:58pm UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185 "2026-07-06T12:58:49Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Alex\_Anufriev](https://discourse.shapr3d.com/u/Alex_Anufriev)
#### Post date: [July 6, 2026, 12:58pm UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/1 "2026-07-06T12:58:49Z")
It’s time for challenge 2 🏁
**What you’re building**
A parametric model of a lemniscate. It’s a figure-eight curve whose shape is controlled by three independent driving parameters. The real test isn’t just modeling the shape. It’s making sure your model transitions cleanly from State A to State B by changing only those three parameters, without breaking constraints, inverting, or deforming uncontrollably.
If your model holds together through both states, you’ve done it right.
**The rules**
Fixed dimensions: A Driving parameters: B, C, and D Driven dimensions: any construction lines, points, or dependent curves needed to keep the shape stable
⚠ Important: your design history tree must contain only Sketches and Extrusions. Any other feature type results in an automatic fail.
Submit your CAD file through this [link](https://forms.gle/T9cvrqh7J7wBqRy99) **by the end of the week on Sunday, July 12.**
Your results are going to be shown [on the leaderboard](https://discourse.shapr3d.com/t/leaderboard-parametric-sketching/41184/3) after the submissions are evaluated.
**Scoring reminder**
- Complete the challenge → earn 10 completion point
- Complete the challenge successfully → earn 6 success points
- First 5 people to submit gets → 5-4-3-2-1 points
- Stay consistent across the challenge → after 3 participations you get 3 extra points, after all 5 participations you get additional 10 points
As usual, questions are welcome here. Good luck!
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### Author:  [@joni](https://discourse.shapr3d.com/u/joni)
#### Post date: [July 7, 2026, 5:06am UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/2 "2026-07-07T05:06:54Z")
Is there any chance you guys could share more information about what angle D actually is?
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### Author:  [@Dalibor](https://discourse.shapr3d.com/u/Dalibor)
#### Post date: [July 7, 2026, 6:42am UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/3 "2026-07-07T06:42:53Z")
Hi joni,
angle D is the angle of the arc annotated in the picture. I hope that helps a little.
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### Author:  [@Fawksey3D](https://discourse.shapr3d.com/u/Fawksey3D)
#### Post date: [July 7, 2026, 7:00pm UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/4 "2026-07-07T19:00:59Z")
Any tips please. Edited….
Never mind. Think i got it now.
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### Author:  [@Ambrus](https://discourse.shapr3d.com/u/Ambrus)
#### Post date: [July 9, 2026, 7:34am UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/5 "2026-07-09T07:34:05Z")
You still have 4 days to complete the second challenge!
Don’t forget, after the 5 challanges the prizes are a 3Dconnexion SpaceMouse + giftable Shapr3D subscription + exclusive merch and digital community badge.
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### Author:  [@Ambrus](https://discourse.shapr3d.com/u/Ambrus)
#### Post date: [July 13, 2026, 12:47pm UTC](https://discourse.shapr3d.com/t/season-1-challenge-2-is-done-parametric-sketching-2-5/41185/6 "2026-07-13T12:47:13Z")
Time to wrap up Challenge #2.
Thank you for participating. How did you find this challenge?
Before we get to the [scores](https://discourse.shapr3d.com/t/leaderboard-parametric-sketching/41184/7), here’s the solution:
[ ](https://www.youtube.com/watch?v=cuWiXlgUtro)