How does SOLIDWORKS(SW) shape a surface, like this one I sent?

Sketch datum plane, Tools-Sketch Tool-Sketch Picture, import this reference picture, draw a straight line with the length of 100, and drag the picture to a similar size.

Draw another sketch on the datum plane, first draw two spline curves.

Draw three more spline curves. (These three can also be drawn on the back datum 1. )

The distance between the new datum and the upward datum 10.

Sketch on the newly created datum plane 1 and convert the solid reference blue curve.

Boundary surface direction 1: two blue faces.

Or sketch on the datum plane 1 and convert the solid reference blue curve.

Draw two diagonal lines on the top datum plane.

Draw an arc with a radius of 30 on the first drawing surface. (Hide Extruded Surfaces)

Draw an arc with a radius of 30 on the second drawing surface. (Hide Extruded Surfaces)

Direction of boundary surface 1: edge -30 arc -20 arc.

Direction of boundary surface 1: edge -30 arc -20 arc.

Draw a short diagonal line on the datum 1.

Fill surface edge-sketch-sketch. (Fixed boundary marker)

Sketch on the top datum plane and convert the solid reference blue curve.

Surface stretching.

Draw a three-dimensional sketch and select two blue faces by crossing curves. (Converted to Construction Line)

Spline curves on surfaces draw curves on drawing surfaces.

The left side is tangent to the intersecting curve, and the right side is weighted.

Boundary surface direction 1: two edges, direction 2: two curves.

It can be seen that the middle surface is not very good. You can stretch a face in the middle, draw an arc on the face and add it to the direction 1.

You can also draw an arc as the direction 1, which is similar to leaving a gap on it.

Draw a diagonal line on the top datum.

Surface stretching.

Draw an arc on the drawing surface.

Divide line Draw two straight lines on the top datum plane to divide the surface.

For surface filling, select the edge of a circle (tangent to the left), and the constraint curve is a pink arc.

So is the one with a gap below.

Plane area.

Surface stitching creates a solid.

Radius of fillet: 2. (Fillet at the top edge, radius 0.5)

Zebra crossing.

Simply render it, it will be fine.