microelly2 wrote: ↑
Fri Jan 10, 2020 9:56 am
To avoid these waves the ribs should be perspective equivalent,
there shoud be a perspective transformation from one rib to the other.
what is the inner geometry of the ribs? how many poles you use.
If you have only 4 poles than this should be possible,
I reduced the number of poles and it got better. Thank you for the tip.
I'm now using 6 to 7 poles for the geometry of the ribs:
2 for the endpoints.
2 more near the endpoints wit a horizontal constraint to get tangential.
2 to 3 to get the shape of the ribs, which is taken from a plan. If I use less for the shape I won't get the desired curvature.
I still have a dent at the ribs because of the guide rails.
I assume this is due to another issue I also encountered: If I try to use Sketcher arches for the ribs which I discretized with curvesWB and redrew with curves BSpline then I lost the tangential slope when drawing the curvesWB spline.
2nd Picture below Shows sketcher splines with geometry as shown in the first Picture.
1st shows the same sketcher spline but discretized and redrawn with curvesWB
So if theres a way to avoid losing the tangential properties of the ribs due to discretizing my Problem would be solved. At the Moment I either have to discretize the guide rails or the ribs in order to snap the intersections for the Gordon mesh.
Might there be a way to set the continuoty during discretization? I saw this menu in the thread but I don't have it in my GUI:
hammax wrote: ↑
Thu Dec 14, 2017 2:14 pm
@Chris_G: some more questions about (sweep_2_rail) <=> Edit: Approximate Points to NURBS.
Working with that tool, one can find some parametrization-options.
- Continuity is almost selfexplaining - are there any recommendations?
- Parametrization grants 4 items - not so clear - a trial and error thing: Any recommendations?
- Smoothing Algorithm - 3 possible Parameters - maybe also a testing and experience thing: Any recommendations?
And one last question @microelly regarding the transormation tool tutorial https://www.youtube.com/watch?v=UQZCsEjYSTM
At the end of your perspective Transformation tool you showed that if you move your Center poin out of the Frame it will cut your spline.
Does this mean that the parts of the spline touching your target Frame is gone? Or will the spline be aligned to the target frame?
If the later were true that would mean that I can draw a parametric target frame with the desired shape (e.g. an arc made from several segments) and force the bspline to the Frames shape? That would be an amazing Feature.