@Rob I used to be good at maths and (maybe because it’s early) that’s clear as mud! Maybe because you skipped all parts of finding out what % of 128 , 41 is? I’m guessing, as I said, it’s early and your post lost me after the pixels per percent; it just seems to presume knowledge of some numbers and doesn’t explain where they came from.

I got my head around it (especially as I’m defying orders and working with 128x40 - no problems so far, early morning maths aside ) by looking at it the following way:

We’ve decided 1 World Unit is 128 pixels - this is a fairly arbitrary decision based on block/paddle width. However our block isn’t a full World Unit high, ie. it’s less than 128 pixels on the y axis.

If we work out how many **times** the ‘height’ of our block goes into its width, we can then **divide** the World Unit width of the block by the same number to get the World Unit equivalent of its height.

So, for a 41 height block, you divide width by height (128/41) and get 3.12195122

And then convert to World Units: 1 / 3.12195122 = 0.3203125 which rounds to 0.32

Anyway, glad you managed to get the snap working @Vaughan_MacEgan