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I would like to reproduce a simplified version of this image, i.e. without the internal details of the wires: just the 5 external colored claddings. Any idea how to do that with Illustrator?

enter image description here

This is what I was able to do so far creating a circle and than extruding it with "extrude and bevel". I would like to add the curvature now.

enter image description here

10

This is a complex job in illustrator as 2D drawing:

  • gloss and reflections on the plastic wire shields
  • perspective
  • changing foreground-background order due the curvature

A receipe would take a day to write.

You can make a good intermediate drawing with 3D as you have thought, but you cannot make extrusions curved afterwards, you must start with 3D revolve.

enter image description here

This is a grouped set of circles which has got Effects > 3D > Revolve.

All settings are essential. Learn them from Illustrator user's quide. You will not get interwire reflections. Illustrator isn't capable enough for photorealistic 3D renderings.

You can recall and tweak 3D settings until you expand the effect to 2D. Only click the revolve effect row in the appearance panel.

You can continue as 2D after applying Object > Expand appearance. Beware: You will get a complex group of small objects.

You can get different lengths to the wires by revolving them separately. Then you must swap the foreground -background order with masking as user Billy Kerr has shown in his answer.

Not asked, but in a proper 3D program you get also the rest of your cables virtually as easily as the outer parts in Illustrator. I did a test. The following took only few minutes. The interiors of the magenta cable are quite simple extrusions at the end of the magenta part. In Illustrator they need much more work.

enter image description here

This is drawn in a freeware CAD (Design Spark Mechanical) which hasn't photorealistic rendering, but the model can be rendered in other software.

An example:

enter image description here

This rendering is from an introductory version of Keyshot. It uses only screen resolution. Available control and the list of possible materials are minimal, but the image can still be useful. It can be used as a guide for adding glosses and reflections manually to Illustrator version (= a job which really needs well polished drawing skills, it is beyond the possiblities of a novice and occasional users)

  • This is excellent, much better than my answer! – Billy Kerr Jun 11 '18 at 17:29
  • Beat me to i t- wonderful. I was going to use concentric circles to get the interiors, but I think this answer nails it! – GerardFalla Jun 11 '18 at 18:08
  • You could still draw the reflections in! and add specular highlights with a texture. – joojaa Jun 11 '18 at 19:41
  • @joojaa yes. Not an especially modest job. – user287001 Jun 13 '18 at 7:34
5

Starting with a path with a gradient and a triangle profile:

Path

Adding a top shape:

Top Shape

Five paths with different gradients:

paths

GRADIENTS

Add a Clipping Mask and a stroke with a gradient at each top shape to simulate the pipe's edge:

Clipping Mask

4

Here's how I would do it.

  1. Create an Art Brush as shown

  2. Apply the Art Brush to paths which can be bent to the correct curves

  3. Expand all the objects - fill the cables with different colours. Copy and paste in place a duplicate of each cable piece.

  4. Draw a rectangle to cover the lower half of the cables. Copy the rectangle. Select the top piece of the first cable and the rectangle and use Pathfinder Minus Front. Paste in place the rectangle again. Repeat for the other two cables.

  5. Change the stack order of the top pieces of the cable so that the blue is on top, the green is under that, and the yellow under that.

enter image description here

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