Creating a complex tubular mesh (in Blender)

Things I want to do

Create a complex tubular mesh

Blender：3.4.1

OS: Windows 11

Create a curve.

There are several ways to create a curve, but any method is fine.

With the curve in 3D selected, select the object data properties,

Change the ‘Depth’ in the ‘Geometry’ group → ‘Bevel’ group.

By changing the depth, the 3D curve will appear as a tube.

Increasing the depth value will make the tube wider.

In this state, the ends are not filled in like a pipe. To fill the ends, check the ‘Fill ends’ option under ‘Depth’.

In Object Mode, select the target curve, right-click in the 3D display area, select ‘Convert,’ and then select Mesh.　

We were able to create a complex tubular mesh as shown below.

Once a curve is converted to a mesh, it cannot be edited as a curve.

If you plan to edit it as a curve, it is recommended that you make a copy.

Similar results can be achieved by deforming tori or cylinders, but creating smooth shapes is difficult.