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I'm trying to make a model of horn acoustic:

similar to this

Actually, it should be a parameterized (for example, exponentally widening) tube, which can than be shaped/curved. I've been trying Curve Modifier but it works OK only for one turn.

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Final:

Final

Overview:

You will need two objects.

  1. Simple Bezier Circle which will Bevel your shape.
  2. Bezier Curved shaped as needed with custom Radius values (per point) for Beveling.

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You can change Radius values by selecting point and changing it's value in Transform tab or by hitting W > Set Curve Radius.

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After that you can add Solidify Modifier and maybe Alt+C > Mesh from Curve.

Blend file:

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  • $\begingroup$ Thanks a lot, Luke! Didn't know about Radius changing. $\endgroup$ – RomanSun Jul 6 '17 at 16:20

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