How to create a curved surface from a sharp edge? Sorry for the basic question, but I have been working on this all morning and can get a basic curve but I keep falling short of what I really want.

I am in the process of making a urban street model (square sections), the first section went very quickly, just a street plane, 20x20cm curb, a sidewalk raised 20cm off the street.

When I moved on to the intersection section, street with 4 round corners with the curb then the sidewalk and be precise enough to have it tile up against the plain street section, I just ran into my modeling limitations.

1st I tried a Bezier Curve, a 20x20x20cm box with array and curve modifiers. I could only get it to work if I did it in the center of a new scene with a fixed count (fit curve did not work). If I applied the modifiers there was all this extra geometry and ending did not seem precise.

2nd I scrapped the curb and just extruded a vertex and used the spin tool for the curve, this worked but now I need to work the curb into the texture of the sidewalk. This worked and not sure if i'm just making things more complex then then need to be.

I wanted a 90 degree curve that fits in a 2mx2m square, one curve that is the 20cmx20cm curb and another right behind it that is the sidewalk.
It is a bit difficult to visualize exactly what you actually want based on your wording of the problem but If I understand the problem correctly, what you want is a curved surface. You can achieve this by just bevelling a sharp edge,

You can take a sharp corner that connects at a 90&deg; angle&hellip;



&hellip;and then bevel the edge using Ctrl + B and increase the segments to round it into a curved surface.