Soft transparent shadows not working for materials without textures

Bugs
1

See this PG: Babylon.js Playground
The material of the cube does not have a texture. I just used the alpha property of the material.
I would expect to get a light grey shadow (with dithering). Is this a known limitation? Is a diffuse/opacity texture required?

2

pinging @Evgeni_Popov

3

In fact the global alpha value is taken from mesh.visibility:

https://playground.babylonjs.com/#UDSA5W#1

I think the global alpha should really be mesh.visibility * material.alpha, going to make a PR.

4

PR:

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