Hello,
Trying to loft the three curves attached creates a really strange detail. I’ve tried rebuilding them but same problem happens. I cannot use a loose loft as it makes the surface not touch the curves. Is there any other possible solution? I have never seen anything like this. please help.
@pascal
What did I miss?
Look very closely at the front-left corner there where the curvature graph in your image disappears behind the surface - the surface doubles back on itself there.
-Pascal
I recommend to use Degree 4 or Degree 5 curves, because they are much smoother than the Degree 3 curves that you have used. Here is an example, where I tried to mimic one of your existing curves with a Degree 4 one. The deviation is very small, but if you check with the “Curvature graph” too, you will notice that the new curve is smoother.
Problem fixed with Degree 4 curves and Loft Loose.3dm (163.9 KB)
As for the “Loft” tool, I try to avoid using the “Normal” option as much as possible and use “Loose” option instead. That also results in a fewer control points. The only downside of the “Loose” option is that the lofted surface will not closely follow the intermediate profiles, because it uses their control points.
However, this is also the biggest advantage if the “Loose” option, because when you turn on the control points of the lofted surface, they are exactly where the control points of the input curves where located. That also gives you more precise control over adjusting the shape of the lofted surface when the History recording is turned on.
Another advantage is that this way you can control the tangency or curvature direction of either end of the lofted surface manually and change it at any time (again, History must be active). To achieve a controlled tangency, you need the first two curves to follow the desired direction of the tangency. The same goes when you want to achieve curvature, but this time you have to place the first 3 curves in the same direction.
Here is a simple example that shows those two advantanges:
Tangency control:
Curvature control:
