Hi all, I’m curious how you all would go about creating a custom geometry for a semi-cylinder where the two corners have a radius that can be controlled. Here is a picture of the basic shape I am trying to replicate, and the end goal is for this shape to be subtracted from a full cylinder with a Bo…

[image] Nathan_Caspar: Similarly I’m wondering if it would be possible to create a similar controllable radius effect on the “corners” for a crescent shape like this one. Addon to create special / extended geometries - #12 by hofk threejsResources/MoonPhases/MoonPhases.html at f7ecc1c0584c47…

This example shows you how you can shape a cylinder geometry according to your wishes. You only need the appropriate formulas for calculating the coordinates, i.e. a little elementary knowledge of geometry. Skinned mesh with dynamic knees BendCylinderToKnee Here you can see the position of the v…

[image] Nathan_Caspar: I’m curious how you all would go about creating a custom geometry … I’d first define the profile as a 2D shape, then I’d extrude it into 3D.

I have been playing around with trying to create the 2D shape but I can’t quite seem to get it quite right. I am using 3 different absarc to create the major radius of the semi circle, and the two rounded corners. Using some basic geometry I am trying to position everything accordingly to the set ra…

I tried to look at your code. I’m not sure I have the time to digest all the Math in it. Here is what I had in mind, when I proposed to extrude a 2D shape. This is a line of semi-cylinders with increasing roundness of corners. The class SemiCyinderGeometry is defined in lines 35-56: https://codepe…

This is incredibly helpful to see how you have constructed the SemiCylinderGeometry, thank you so much for helping out here!

x = Math.sqrt(R*R-2*R*r) Love the elegance and simplicity :+1: Costed me a couple of cups of coffee to realize why it is so, as I’m not a math guy at all :sweat_smile:

I am also not a math guy, how would you go about creating a crescent shape with round-able points? I am assuming it would be constructed with 4 absarcs, one for each major curve and one for each rounded point, but I am unsure of the math needed to calculate the properties for those rounded point abs…

I suspect the following logic is what I need to derive the cresent shape given user specified inputs of each major radius and the radius of the desired rounded corner, but I am struggling to translate this to three. Ellipse in Arbelos Ellipse in Arbelos: the locus of circles tangent to…

https://codepen.io/boytchev/full/mdYrLOj [image]

Semi-Cylinder Geometry with Radiused Corners

Questions

hofk May 16, 2024, 6:49pm 2

Addon to create special / extended geometries - #12 by hofk

threejsResources/MoonPhases/MoonPhases.html at f7ecc1c0584c475225570dea6f5cd2f32dda96d3 · hofk/threejsResources · GitHub

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Semi-Cylinder Geometry with Radiused Corners

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