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Is there a tool (a module or a easy method) to duplicate an object many times, randomly in delimited zone (the inside of a sphere for example) ?

Rather like the airbrush tool in a raster graphic editor (illustrated below), but instead of drawing dots, it would duplicate a preselected object :

enter image description here


Note : I don't wish to use particles systems to duplicate objects (I need to keep control on positions)

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    $\begingroup$ There's the randomize transform operator.. It doesn't support distributions inside arbitrary shapes, but it can be used to spread out objects in a random fashion (and optionally scale and rotate them). To distribute objects inside an arbitrary shape you'll need to use a particle system. You can always convert the particle system to real objects later in order to fine-tune their positions.. $\endgroup$ – gandalf3 Apr 15 '15 at 21:22
  • $\begingroup$ I was not aware of this functionality. Converting a particle system to real objects seem to make exactly what I want. $\endgroup$ – JeanJouX Apr 15 '15 at 22:33
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See this question for details on how to setup a particle system for distributing objects inside a shape.

Once you've done that, you can convert a particle system to real objects with ⎈ Ctrl⇧ ShiftA or the convert button in the modifiers panel:

enter image description here

Note that this won't remove the particle system, so remember to delete it if you are done with it.

enter image description here

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