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Newly added objects are always added from their centers by default. I'd instead like to add them from their top-left bottom corners.

Below is an example: enter image description here

I don't want to adjust the origin afterwards, but from the outset when I add a new object, they should be added, scaled or rotated from the top-left bottom corner position.

So, for example, if I wanted to add another object on top of this cube (e.g. cylinder), all I should need to do is to move the 3d cursor to the top-left top corner of the cube and then add object without needing to translate it along the x/y axis for alignment with the cube below.

At the moment however, whenever I add a new object it gets added from its center, as shown below: enter image description here

Is there any way of changing this?

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    $\begingroup$ You could hook a Python script into the calls where your Meshes are being generated and do the translation via Edit-Mode there. Or you might just assign a Hotkey to a Script that does the Translation as afaik there is no such functionality implemented in Blender yet. $\endgroup$ – Samoth Apr 18 '16 at 12:33
  • $\begingroup$ So, every mesh object will always be added from its centre of mass. There's no way of changing this? So, if I wanted to add that cylinder on top of that cube, I would always have to translate it in x, y and z position, just to get it to sit on top of the cube? Or I suppose the only other alternative is to position the cursor to a place that keeps the center of mass in mind? $\endgroup$ – user62109 Apr 18 '16 at 12:38
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    $\begingroup$ You can use the CreaPrim add-on to make custom versions of your primitive meshes that have their origin points where you want them. $\endgroup$ – Mentalist Apr 19 '16 at 17:25
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As far as I know there is no built in way of doing this natively, at least not without some python coding or script/addon involved.

There is one addon for aligning objects that has an additional feature that allows you to align object centers directly from object mode though.

It doesn't do it automatically but maybe it can save you a few steps http://blenderartists.org/forum/showthread.php?256114-Add-on-Advanced-align-tools

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