I draw out the measurements you provide as lines so that I can do the triangulation and work out the angles, and then draw in the actual pole of curtain track so that you can see exactly how it will look before your track or pole is manufactured and delivered, below are a few examples of how this looks.
This is a Cameron Fuller bay pole for a five bend bay window, the Cameron Fuller bay pole system
The track below is a Silent Gliss 1080 with return bends and it is ceiling fixed. Made to measure tracks which are ceiling fixed allow for a bit more tolerance so far as the measurements are concerned, although I still go through the same process for all bay window tracks and poles to ensure an exact fit.
This track also has return bends, I’d very much recommend viewing my page on measuring bay windows especially if you have return bends.
There are few restrictions on what can be achieved so far as providing a custom made to measure track or pole, the example below shows a swept bend in a large conservatory.