Bug: Inconsistent Loft

[Rhino_Bulgaria (Bobi)]

Sometimes “Loft” will create some inconsistent results. Just had a situation in which it happened again. I use totally the same mirrored objects as an input geometry, so there should not be an issue. However, if you check the video, Rhino seems to get confused about the isocurve direction to which it matches the tangency of the lofted surface to the target surface edge:

Bug: Inconsistent "Loft"

This issue looks quite similar to the one that happens with the “Match target isocurve direction” option of the “Match surface” tool:

VSR end of Life-

Being one of the most progressing topics in a short period of time means that the discussion is very important for the Rhino users who demand for better tools that could make their work quicker and easier. For example, Alias has an optional “Explicit control” inside its main modeling tools which is a huge advantage when it comes to surface quality, control over the general shape, time and ease of achieving G2 curvature continuity by adjusting far less control points subsequently.…

[pascal (Pascal Golay)]

Hi Bobi - thanks, I suspect you are correct that it is the same bug as the tangency one from the other day - both have been logged.

-Pascal

[Tom_P]

i think it s the same as this topic

BUG - Loft start end tangent don t behave symmetrical

see attached file and screenshots. this is a (rotational) symmetric setup but match start / end tangent do not behave the same. one edge the isocurves match the target on the other they don’t @pascal i would claim it s a bug - or do i miss something ? thanks - tom loft_unsymmetrical.3dm (215.2 KB) [Screenshot 2022-05-30 at 18.53.06] [Screenshot 2022-05-30 at 18.53.21]

for my example above - reverse the click / select order will reverse the problem (first picked edge correct, last picked edge wrong)