How control the bottom side with the Flow along surface

Rhino
,
1

Hi all,
I had other 3D experience that can use two face to morph the 3D without deform the bottom side, as the image.

image
image952×406 100 KB

I try to use the flow along surface, but I can not control the bottom side.
Could help me to solve this question, thanks

2

Hello- I am not sure what this means - do you want he face that is away from the target surface to remain flat and the face that is on the target surface to take the shape of that surface?

-Pascal

3

Sorry for the confuses. I explain in more detail as describe below,
image

4

Hello- from your image, it looks like a case in Rhino where you would simply trim or BooleanDifference the top, curved surface from all of the smaller parts - and not use FlowAlongSrf at all. Can you post an example?

-Pascal

5

Thank you for your reply. There is a boss on the smaller parts.
I don’t think that using simply trim or BooleanDifference the top can get the final shape I want .

image
image782×384 3.85 KB

Please find the attachment .
flow_along_surface_test.3dm (1.4 MB)

6

Hello- you can do this my flowing cage conrol points - it seems a little messy but it works.

image
image618×638 63 KB

flow_along_surface_testMaybe.3dm (294.9 KB)
Note you need to set ConstrainNormal=Yes.

-Pascal

7

I’m grateful for your assistance.