How to make unit selection circles merge?

Posted by MaT on Game Development See other posts from Game Development or by MaT
Published on 2014-08-11T11:09:10Z Indexed on 2014/08/21 10:31 UTC
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shaders

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selection

I would like to know how to make this effect of merged circle selection. Here are images to illustrate:

enter image description here

Basically I'm looking for this effect:

enter image description here

How the merge effect of the circles can be achieved ? I didn't found any explanation concerning this effect. I know that to project those texture I can develop a decal system but I don't know how to create the merging effect.

If possible, I'm looking for purely shaders solution.

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