Creating a sphere from a rounded cube is causing ridges I'm hoping you can help me with a basic issue that seems to have me stumped!
I've been trying to create a sphere from a rounded cube but I've had a problem with it not joining correctly and I'm having issues with it creating a harsh ridge around the x and y-axis. (Second picture should show this)
I'm following a tutorial where you place a rounded cube, pop the radius at 1, pop the object in edit mode and delete half of the verticies (pictured below)

I'm then adding a mirror modifier, and ticking the &quot;Clipping&quot; box, and then adding another subdivison surface modifier of 2. The tutorial I'm following has a perfectly spherical appearance but mine has these harsh ridges.

I thought adding &quot;Shade smooth&quot; on object mode might help but it has worsened my problem.

Any insight would be greatly appreciated :) Here is the tutorial I am following if it helps explain my problem at all. https://youtu.be/rEBwBrRzyhw?t=180
Many thanks,
Ali
You have overlapping vertices as you can see here (I had to disable the Proportional Editing option as it would move the other vertex):

It creates a face that stick to the mirror axis, thus the artefacts. So select all and Merge by Distance to remove all unwanted vertices.