Best way to higlight border of selected object?

I want the selected cube to be highlighted. I have achieved this effect by creating another object and teleporting it to the selected cube. I can be seen here: https://imgur.com/a/duaJW.
The problem is that it doesn't work when the cube is scaled: https://imgur.com/a/uNxSU.
So what is the best methoud to get the result of picture one for all cubes with different sizes? Thanks for all help!.

EDIT: The cubes are created from six panes instead of a cube as the default cube doesn't support multiple textures

 

Hi,

do you test reseach about shaders for highlighted selected objects?

 

I have doon some search and found multiple shades that don't work. Even I find one that works as I want how should I turn on/off the highlights without changing it for the shader and therefor all object? Or is it best to change between shaders?

 

You could just assign a separate material for the highlighted object during the time it's highlighted.

 

you can have two material how public vars, first material within texture and non-highlighted, and second material is only the shader that highlighted the object, in your code must asing the material highlighted when the object is selected, and asign the normal material when the object is not selected.

 

Do you have a link to a working outline shader? I remeber find one that worked but it didn't hightligh the object like I wanted (like in the picture)

 

Maybe you can find this link helpful:

I'm not an expert in graphics but my interest on it allows me to learn new things.

 

Thanks, will take a look

 

Hi,I developed the outline shader,maybe it can help you:
https://www.assetstore.unity3d.com/en/#!/content/99968


The video on youtube: