How can I make a tube and bend it in run time

[jauregui]

Sorry for bother you guys but I am kind of bad in Math, I want to make like a tube and bend it using curve radius in a run time giving some inputs data like angle and distance.

Some one have an idea where and how to start?

Thanks.

[marquizzo]

Maybe these conversations can get you started in the right direction:

How to convert this geometry opengl code to three.js?

Hi there, I am trying to follow this tutorial, where they show how to make a bending cylinder in C and opengl (at Edit2) Would anyone who knows C be willing to turn this into a three.js codepen? Or explain how to do it in three.js

How to bend a cylindrical geometry by X degrees at X height (and do it multiple times)

Hi there, i’m working on this pen where i’m attempting to bend a long geometry at X height by X degrees and for X area of effect. https://codepen.io/funianrun/pen/QzQQJB I’ve managed to bend it in a long arcing motion. However i’d like to confine the bend to only a section of the cylinder and not the entire thing. In my main project, the geometry is bent after applying effects like waves, and after extruding it from a bezier curve created in a 2D canvas. I tried lerping from the original ve…

Also, I think @prisoner849 might be able to chime in with other good examples.

[prisoner849]

Another option:
https://threejs.org/docs/index.html#api/en/objects/SkinnedMesh

[EliasHasle]

If it is a constant bending radius, or any other bending whose position and rotation offsets can be expressed in closed form, you can have a transform in the vertex shader that takes a straight, axis-aligned tube and transforms it to the desired bend, before applying the projectionMatrix*modelViewMatrix. Ideally, you will also find a way to transform normals. (I don’t know how to do that for any specific case, and certainly not for the general case.)

[hofk]

Maybe there’s something for you

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https://hofk.de/main/threejs/skeleton/03_skeleton.html
https://hofk.de/main/threejs/Hummel%20Mara/14_hummel_bumblebee.html
Comments unfortunately only in German, but easy to translate with deepl.com/translator ( I always take).

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https://hofk.de/main/threejs/skeleton/00_skeletonBasic.html

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https://hofk.de/main/threejs/sandboxthreef/formLibrary.html
to the addon see THREEf geometries and Addon. Produces almost infinite many time-varying geometries with functions