cadquery

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I'm really struggling to make any sense how the projectionDir option works in exporting a SVG. The documentation tells me: Direction the camera will view the shape from., but how is that direction defined?

Imagine the following example

import cadquery as cq

box = cq.Workplane('XY').box(10, 20, 10)
box = box.faces("<X").workplane().circle(2).cutThruAll()

cq.exporters.export(box,
    "box_custom_options.svg",
    opt={
        "width": 300,
        "height": 300,
        "marginLeft": 10,
        "marginTop": 10,
        "showAxes": False,
        "projectionDir": (1, 0, 0),  # <-- I'm lost how this works
        "strokeWidth": 0.25,
        "strokeColor": (255, 0, 0),
        "hiddenColor": (0, 0, 255),
        "showHidden": False,
    },
)

When you run this in cq-editor you will get the following SVG

But I want that image 90 degrees rotated like so

But I can't get my head around how to do that. Are there any examples how projectionDir works and how to use it? It would be really nice if it was possible to define the rotations about the XYZ like you can when assembling parts.