Is it possible to make this topology into a square without twisting, rotating the vertices to get a perfect square? I know my mesh because of the circle in the middle has gone into a circular topology, but some parts I need them to be rectangle shape. So if there's an easier method I'd like to know, thanks.
If at all possible, I would work the other way round, without the circular topo.. It's easier to make a square region circular, than to make a quarter-circle square.
- Inset squares (you could make them bigger first, if wanted)
- Scale out a region to accommodate a circle
- Shipped add-on: Loop Tools > Circle the inner region, and inset the circle.
If you needed supporting loops for extrusion and subdivision, or other hand work, you could work under a Mirror in X and Y
You can do this with custom transform orientations.
Select one of the edges pointing towards the circle's center. Above the viewport (a dropdown that says "Global") add a new orientation with a "+" button. The Y axis is now pointed along the selected edge. So now select the edges you want to be perpendicular to it, and flatten them along the new orientation's Y (press S, then Y, then 0, then Enter).
Now that you've flattened the perpendicular sides, you can use them as a second new transform orientation. So again click "+", and now flatten the other two sides along the new Y.