Hi Vile. I'll give this a try, although I'm not worthy of the "expert" title. Let's work on the example in the upper left corner from your link. Create your planetary sphere and assign textures, etc. Next create a cube with one corner poking into the planet center. This will be the Boolean subtraction, or negative object, when they are joined. Perform the Boolean operation. Now create a new sphere for the planet core and assign textures, etc. Position this sphere in the exact center of your first sphere. You will still be able to see the cube after the Boolean operation, but when you render, it should resemble the diagram you want. Let me know if this doesn't work, and I'll create the scene for you and email you. Good luck! P.S. If you want to have other layers, create all of those spheres with textures and nest them inside each other, then group the whole shebang with the cube and subtract out the cube. Then add the last sphere for the core. May the Force be with you.