8000 Is it possible to create a helix? 🧬 (modeling screws) · Issue #79 · ricosjp/truck · GitHub
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Is it possible to create a helix? 🧬 (modeling screws) #79

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twitchyliquid64 opened this issue Oct 25, 2024 · 3 comments
Open

Is it possible to create a helix? 🧬 (modeling screws) #79

twitchyliquid64 opened this issue Oct 25, 2024 · 3 comments

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@twitchyliquid64
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For modeling threads, it would be great to ‘rsweep’ the thread profile (trapezoidal or V shaped) in such a way that it rotates multiple times and gains height, then combine that with a cylinder to form a screw.

image

Is a helical rsweep possible today in truck? If not so, may I kindly ask a feature request?
@ytanimura
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Well, we have a plan, but we are still struggling with it. In the end, we have to make a decision somewhere.
Implementing a spiral structure with NURBS results in an approximation, so we should create a specific structure for spiral, but it cannot be directly output that structure to STEP.

@twitchyliquid64
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twitchyliquid64 commented Oct 28, 2024 •
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Understood, thank you for the reply!

I wonder if a naive implementation could be a specific structure which, as the u/v parameter along the spiral increases, the returned point/vector (in ‘ParametricCurve’ methods) translates proportionally in the direction of the spiral. I do not understand all of the traits to know where this won’t work however.

@hyarion
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hyarion commented Jan 20, 2025

Worth noting is that OCCT struggles with this too, see https://opencascade.blogspot.com/2015/08/arbitrary-law-based-curve-and-surface.html for workaround there.
It might be good to support non-standard curves and surfaces and do the approximation at export instead.

IIRC other (proprietary) kernels that support helices handles it in that ways - handle helices exact internally and do approximations when needed.

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@hyarion @twitchyliquid64 @ytanimura
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