Hello Michael ! Thank you for chiming in so quickly as always.
I absolutely should have been more clear and should have annotated the diagram to begin with. Here goes :
On this diagram I would describe the blue rectangle/boundary as my desired "page". Within this page lies a subject (here a simple character pinup outline, drawn in black), which does not fully fill up the page. That is to say, the bounding box of the content is much narrower than my desired render.
At a high level the thing I am after is a way to render out this rectangular blue "page", at given pixel width and height or as some multiple of its current screen presence (which I could then scale down later, respecting the proportions). 2D vector drawing programs tend to have a few options for that (rendering out the page itself, cropping things down to the bounding box of the art content, and so on).
Of course, having such a rectangle to define the page boundary is just one way I can think of to define this desired rendering area. If I could somehow feed up the coordinates of the 4 corner points (0 0, 0 10, 20 0, 20,10) and instruct the renderer to render the content within these corners at a set pixel width/height, that would work too.
The one tricky aspect of it all is that if the page boundaries were to be defined by a rectangle shape in the scene, this shape will have line thickness once rendered, hence the resulting image wouldn't quite match the original layout anymore if the boundaries were defined by the rendered objects with thick lines.
I hope this makes more sense !
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