What better way than the flow command

Unfortunately, there is always this deformation when bending with the flow _local command. Is there another way of displaying it?

Hello- please post a file with all of the inputs you usee for the Flow.


these are very few commands.
The part is 40 x 20 + 20 x 20 mm, 2 mm thick
I’ll show the actual line (blue) and the target line (red)
The influence radii are 20 and 24 mm

Please post the Rhino file with the relevant geometry.

You can easily see the geometry from the pictures.
In addition, it does not depend on the exact dimensions.
It’s about the principle. The error (this deformation) always occurs
if the bending edge is inside the main part.

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Good luck :joy:

flow-1.3dm (40.1 KB)
flow-2.3dm (308.5 KB)

You get a better result if the bending happens just on the extension of the part.

If the edges need to remain at the exact place, split the object into three parts and flow the middle piece only. Then join with the two smaller segments next to it.

If you want to simulate the look of a bent piece of sheet metal, you would have to add relief cuts next to the bend.

This could be cleaned up a little more. Depends a bit on what you really want to achieve.

flow-2.3dm (621.8 KB)

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The inside surface could be bent, and then OffsetSrf used to add thickness.

good idea, but the offset command doesn’t work.
The area cannot be selected.

I often have to create article images with such bends. Of course you can simulate this bend with a lot of effort.
But I was hoping for a way to use _fl o w
to reach.
flow-4.3dm (307.3 KB)

Would this be a tolerable result?

flow-4.3dm (444.9 KB)

It works here

In contrast to the original post, the bending on your object seems to be just in the narrow part of the object…

i always thought workflows like this should be possible with
using a smaller cage/control then the object, and the option .
not moving 4 rows / columns of points for a degree 3 cage.

but possibilities are quite limited.
not sure if i am allowed to call it a bug @pascal

the refinement of the initial polysurface does not handle this in a proper way.
my screenshot shows the same cage/control - edit with the polysurface and a mesh.
the polysurface gets refined but behaves unexpected towards the edge.
the mesh that hopefully reflects the cage-deformation more direct does not show this deviation.
(therefor i assume, the surface-refinement is not handling this in an - at least intuitive way for the user)

unexpected deviations towards the wavy edge

expected behaviour with mesh

kind regards -tom

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