GroundMirror reflection very jaggy - How to increase the resolution?

Questions
1

Hello, I’m using the “GroundMirror” parameter of the “createDefaultEnvironment”,
but the result is very jaggy.
https://www.babylonjs-playground.com/#VWI383#4
I’ve seen through Inspector tool that the default resolution is 256, is it possible to increase it?
Many thanks!

2

I’ve quite solved with groundMirrorSizeRatio: 1

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