As shown in the following figure:
https://playground.babylonjs.com/#XCPP9Y#14829
A semicircular shape cannot be achieved with cornerRadius
What I want to achieve:
I took a look and used the test environment for testing, but the effect did not meet my expectations,
The semicircle is not reached
https://playground.babylonjs.com/?snapshot=refs/pull/12863/merge#XCPP9Y#14908
Yes, I agree that it is not reached. Something around the x-value, may be?
If I scale the container on X, I am that close to reaching it.
If you split the rectangles both are rounded:
But when they are overlaid on top of each other some pixels from the bottom bleed through and give the impression of a less rounded shape.
Hmm 
. No (sry), I’m afraid this example does not match a semicircle shape. Just draw a circle on top of it and you will see that it isn’t.
I reviewed the maths for drawing rectangles, now we can get a circle! Draw rectangles with properly rounded corners by carolhmj · Pull Request #12876 · BabylonJS/Babylon.js (github.com). Thanks for double checking the fix ya’ll 
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