if you are smoothing, press shift, click on where you want to smooth and hold, then let go of shift and continue smoothing. Releasing shift activates a different smoothing algorithm that is better for this kind of topology.
I'm happy to help! Yeah smoothing as in smoothing groups. From the screenshot it looks like the smoothing is set somewhat arbitrarily. If that is Modo try setting the smoothing angle to 179 and exporting the low again.
My work uses Redshift, which apparently has a different smoothing algorithm to Maya's default OpenSubdive Catmull-Clark. In Maya's default smoothing, border and corner vertices are not pulled. In Redshift smoothing, all verts are pulled to the next vert, whether or not it is a border vertex. This requires support loops to…
Awesome, thanks for the fixes/improvements :) For the smoothing, would it be possible to also have, or instead of smooth by Angle? So faces could be smoothed be 45degrees or something. So then, if we turbosmooth with smoothing groups, it isnt all the same.