Hello DavidRig,
I think you can try something like the following (just a quick test for TopXY render for unreferenced models):
chunk = PhotoScan.app.document.chunk
point = chunk.region.center + PhotoScan.Vector([0,0, chunk.region.size.z * 3])
T = PhotoScan.Matrix([[1,0,0, point.x], [0,-1,0, point.y], [0,0,-1, point.z], [0,0,0,1]])
image = chunk.model.renderImage(T, chunk.sensors[0].calibration)
image.save("D:/render.jpg")