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Shared transparency


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I am looking for a solution to achieve some kind of 'shared' transparency for parent and child meshes. 

Here is my simple playground https://playground.babylonjs.com/#IVDZNQ
The idea is to make both boxes be transparent against the ground (and other meshes) but not transparent to themselves. Please see the picture below.

Can you help me with this?

Thanks for your kindness. :)




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you can use 2 renderTarget for make that

1. for render transparent area inside of black Area https://www.babylonjs-playground.com/#1TYWYB#186

2. render nan transparent meshes  https://www.babylonjs-playground.com/#1TYWYB#187

then mix that with postprocess


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