Thats amazing. So then all i have to do to hide one cube is just puttin a line in the correct coordinates.
A thing i forgot to say is that its not necessary to move the cube. But just to hide it.
Though moving it might be cheaper.
By vertex color:
I came up with a different solution. Though im afraid this might be expensive.
That is to assign a color to the vertices in blender.
Then in the material I use a Per Instance Custom Data Value to hide the cube that is dead:
So i tested with 3 cubes with red green and blue, and it works amazingly well.
Here is how the material looks like:
The only issue with this is that it needs one vertex color per part of the mesh you want to destroy.
Then just remove them like this:
What do you think of this, like in terms of performance?