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?
You can access the render border values via the outliner if you change its display mode to 'Datablocks':
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:
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
For more control I've written an Add-on which allows to set the Render Border in Camera View:
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
Shifting the box
Repository: https://github.com/p2or/blender-renderborder
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1$\begingroup$ 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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$\begingroup$ This looks great! Before I start digging deep in the code: would it theoretically be possible to write an addon which lets you draw a custom shape for the render border? My use case is as follows: I have a nice shot but it contains also a great part of a white wall. So I'd like to set an L-shaped render border which leaves out the wall. $\endgroup$ – Vincent Jan 13 at 13:16