ThreeJS take screenshot of canvas from 2 sides

I have a 3D cylinder object that has 2 images applied to it, each takes half of the cylinder. So far I have managed to take a screenshot of the canvas and then saving it to PDF file using jsPDF.

But it only takes the screenshot of the front (visible) part of the cylinder. Is there any way how can I rotate and get also an image of the other (hidden) part of the cylinder? Basically want to get a screenshot of both parts of the cylinder where each has different image/color assigned to it.

Thank you!