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I'd like to visualize a bounding box of a 3D object in the 2D rendered image like in the example image below.

Bounding box example

My idea is to use the line draw function presented here but I don't know how to transform the 3D bounding box coordinates in the object into 2D coordinates for the line drawing.

frthjf
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    related: http://blender.stackexchange.com/questions/7198/save-the-2d-bounding-box-of-an-object-in-rendered-image-to-a-text-file – p2or Nov 17 '15 at 12:59

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