All geometry nodes procedural planet project file (Patreon)

the video gives a detail procedural on the process, this is going to be a quick breakdown of the different nodes used in the node tree.

step 1 Volume Cube:

the volume cube nodes gives you a volume in a shape of a cube that we later turn into a sphere, there is a mesh to volume node that you can use to turn a sphere mesh into a volume sphere directly but the reason we are not using it, is because its density input does not support fields only supports a float value, the only node that could do what we want easily is the volume cube as its density input supports a noise texture.

Step 2: turn volume cube to volume sphere:

to do this we are going to use the 3 nodes in the image above inside box 1

full breakdown: https://blendereverything.com/2023/01/07/how-to-make-a-procedural-planet-using-only-geometry-nodes/