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6

Blender comes with an add-on called Mesh:LoopTools. Enable it in the Preferences then you will see it in the N-panel (N). Select the first 2 vertices at the beginning of the ramp and move them down to the floor along the Z-axis. Then select the vertices of the edge loop that you want to smooth. Make sure the vertice at the beginning is the active one (...


3

This answer is a slight piggy-back on @Blunder's.. (apologies.) It still uses the shipped add-on Loop Tools, but takes advantage of its Curve operator to make your slope in one move. The Curve operator depends on selecting vertices in a single, unambiguous, loop of edges. You select the vertices in that loop you would like to remain fixed. The remaining ...


3

Just for completeness, for a square profile, you don't need a profile object; this 3D curve has been given a native bevel at minimum resolution, all vertices tilted to 45 degrees... And a curve can be given a Bevel Modifier to stand in the way of smooth shading interpolation over sharp corners: here, 2 segments with a profile shape of 1. And the bevel is ...


3

Because by default is spline set under Properties Editor > Data Properties > Active Spline as Smooth When Smooth unchecked, curve become shaded Flat, which means flat also in curvature. To make it smoother you can increase Resolution U (segment subdivisions) But in some cases it would be still segmented ... so Edge Split modifier seems to be better ...


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