Substract complex mesh

[Naznarok]

Hello! How can i substract complex mesh from box? What am i doing wrong? Here is link for my Playground (babylonjs-playground.com)

I was able to do this by adding a cube to the model which I use for the cutout. Is it possible to get such an effect without using this cube?
Playground (babylonjs-playground.com)

[carolhmj]

I’m on my phone so it’s a bit hard to look at the meshes, but your sink mesh doesn’t look like it has volume, which would mess up the CSG computation. In general, it’s better to have solid meshes when you do CSG.