Help with result sizing?

I have recently started with Filter Forge in Affinity and come across a problem.
I wanted to do slightly different things with polar conversion and wrote a script ( being a programmer it's the obvious way to work out an algorithm)
My simple MapScript creates a shape as I want, but the returned item gets compressed into a square at the end of the original image dimensions.
Swirl It filter behaves similarly, but CFandM Polar stretches the result to fit.
What I am trying to achieve is like the cityscapes produced by Space Ray - a square image containing a circular distortion of the original.
Questions:
1) Is it possible to force the Result to ignore the image dimensions and produce a square like the cityscapes?
2) if so , how ?
Thanks for any assistance!
I would put examples here but it's refusing to attach my jpegs

maybe the examples will show now

That's weird. Here, let's try this again.

https://www.filterforge.com/filters/14665.html

There. I tested the link


Ok. I see what you mean.
Maybe this is closer to what you need ( with a little modification)

"Mandalaic Tiling V2"

https://www.filterforge.com/filters/6140.html

I Hope that helps.

still trying to upload an image ...

Excellent! good job.

Quote
westdale wrote: 'Frame is the only component aware of the original image dimensions'

In a map script you can get access to the original dimensions as OUTPUT_HEIGHT and OUTPUT_WIDTH. Is that what you were looking for?

Thanks both for helping this beginner ... will play with those.
Slightly amused by the thought that OUTPUT_HEIGHT might give me the input height ....