feat(editor): the work of the editor sessions not committed yet, as it stands: a curve traced on from the end of the diverging track of a switch goes on at its radius with no transition in, or from a straight right at the switch (alignment start_held, fit_going_on), the plan taking an end adjoining R 10 km or more for a straight; the switches and slips laid into curves, slid along them and laid alone on one straight (frame_path, switch slide); the route plan reading curves going on from the tracks adjoining, the kept designs taken or forgotten; the orthophoto and terrain model settings, downloads and layers, the tracks onto the terrain; the curvature of a path in the plan (bezier::plan_curvature); the Polish texts of all of it. Not built as committed

world/Segment.cpp

@@ -923,6 +923,11 @@ bool TSegment::RenderLoftSpan( gfx::vertex_array &Output, glm::dvec3 const &Orig
                 auto const onwall { paired ? ( false == open( partner ) && clamped( partner ) == side ) : moved == count };
                 if( onwall ) {
                     wall = ( side > 0 ? outerwall : innerwall );
+                    // a face of the profile squeezed onto the wall from the other side of the rail keeps facing that side: the thin plate a
+                    // planed blade gets to near its tip is lit from the middle of the track as its face there, not as the one against the stock rail
+                    if( static_cast<float>( Span.side * side ) * ShapePoints[ j ].normal.x < 0.f ) {
+                        wall = -wall;
+                    }
                 }
             }
             if( drop > 0.0 && shape.position.y > Span.head.x && Span.head.y > Span.head.x ) {