PointCloud With Real Alpha on Points

Questions
1

I have a case where I need to have actual alpha on the points being displayed by a variation of a CustomMaterial.

https://playground.babylonjs.com/#AXTHV6#6

Right now the points are opaque and get darker only as the alpha, I need them to actually be transparent.

Here is what happens when I mess with the alpha:
https://playground.babylonjs.com/#AXTHV6#7

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