Easy what to make hollow cylinder?

[gaelbeltran]

Hello, 

 

I was wondering if there's a way to make a cylinder and remove his top and bottom faces. And also if is possible to customize his number of faces, like an octagon, hexagon, etc.

I'd prefer not to load a new model for a simple mesh like that.

[adam]

You can use createTube:

 

http://www.babylonjs-playground.com/#1A4DON#13

 

or createLathe:

 

http://www.babylonjs-playground.com/#1KN1LB#25

[gaelbeltran]

Wow, that's EXACTLY what I was looking for! Thanks.

[mwpowellhtx]

What about if you want to control the thickness? Say with OD 12" and ID 10"; or what have you.

[adam]

I'd use CSG like this:

http://www.babylonjs-playground.com/#1F1AHQ#2

[HiteshSahu]

More Generic approach to create hollow Cylinder and Cones

https://www.babylonjs-playground.com/#1F1AHQ#10

 

for hollow tube set 

    var outerTopDiameter = 4
    var outerBottomDiameter = outerTopDiameter

    var height = 5;
    var thickness = .1
    
    //Outer Cylinder
    var outerTopDiameter = 4
    var outerBottomDiameter = 7

    //Inner Cylinder
    var innerTopDiameter = outerTopDiameter - thickness
    var innerBottomDiameter = outerBottomDiameter - thickness

    var tess = 20;

    var inner = BABYLON.MeshBuilder.CreateCylinder("cone", { diameterTop: innerTopDiameter, diameterBottom: innerBottomDiameter, height: height, tessellation: tess }, scene);
    //BABYLON.Mesh.CreateCylinder("inner", height, innerDiameter, innerDiameter, tess, 1, scene);
    var outer = BABYLON.MeshBuilder.CreateCylinder("cone", { diameterTop: outerTopDiameter, diameterBottom: outerBottomDiameter, height: height, tessellation: tess }, scene);
    //BABYLON.Mesh.CreateCylinder("outer", height, outerDiameter, outerDiameter, tess, 1, scene);

    var innerCSG = BABYLON.CSG.FromMesh(inner);
    var outerCSG = BABYLON.CSG.FromMesh(outer);

    var subCSG = outerCSG.subtract(innerCSG);

    var mat0 = new BABYLON.StandardMaterial("mat0", scene);

    var newMesh = subCSG.toMesh("csg2", mat0, scene);

    scene.removeMesh(inner);
    scene.removeMesh(outer);