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I know I can set the render border with Ctrl+B and dragging a box. But is there a way I can exactly specify the border dimensions?

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You can access the render border values via the outliner if you change its display mode to 'Datablocks':

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You can then navigate through the tree structure of the outliner to the border values via Scenes> Scene (may be different depending on the name of your actual scene)> Render Data:

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The border values can be set from 0-1, so unfortunately you can't set exact pixel coordinates without some maths. 0 is the left side of the camera and 1 is the right side of the camera for the 'x' values (or the bottom and top sides of the camera for the 'y' values).

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  • $\begingroup$ Perfect, that's exactly what I was looking for. I actually prefer this way as opposed to pixel coords. $\endgroup$ – PGmath Jan 8 '16 at 16:25
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For more control I've written an Add-on which allows to set the Render Border in Camera View:

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Install the Add-on via File > User Preferences > Add-ons. Once it's enabled, use Ctrl+B in the Camera View (Numpad 0), select the Camera and go to Properties > Data > Render Border.

Half size

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Shifting the box

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Repository: https://github.com/p2or/blender-renderborder

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    $\begingroup$ Helpful addon! It's still a bit clunky to set it up to render out a section of an image at a fixed size, but infinitely easier than doing it without the addon. $\endgroup$ – MrFlamey Feb 3 '17 at 2:56

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