I am the original author of that post from 2009. I recently started working with C3D 2014. The HEC-RAS export function is improved, but the issue with skewed cross sections still exists: the surface line does not follow the cut line. This is apparent when you review the GEO file. Attached is a completely arbitrary GEO file showing three cross sections, the middle of which is skewed with a dogleg section.
My old post mentioned problems with exporting sample lines created from polylines. This seems to be remedied now. In addition, the polyline (cut line) can contain more than 3 vertices, so long as the sample line is perpendicular to the CL at the CL.
Can Autodesk fix this problem? If not, at least warn users that cross sections (sample lines) must be perpendicular to the centerline (alignment) at the alignment.
Access a broad range of knowledge to help get the most out of your products and services.