_FlowAlongSrf Rhino vs MOI

Mario · January 30, 2016, 10:21am

One of the useful commands in Rhino is _FlowAlongSrf that, in my opinion, lacks a few options.
Image shows the different behavior between Rhino and MOI using _FlowAlongSrf , and personally I prefer the result of MOI.

I attach the file, someone can tell me how I can get the same result?
I tried everything (reversal of normal etc … etc …) but to no avail. Only by moving the cylinder under the plane i obtain that it will recline on the upper face of the hemisphere, but not to maintain the side walls of the cylinder vertically.

flow.3dm (380.2 KB)

0netech · January 30, 2016, 10:30am

Hi, Mario! You should reverse the target surface N direction (white arrow) with Dir command.

Mario · January 30, 2016, 10:34am

Thanks for answering 0netech… i did it , but no lucky !

0netech · January 30, 2016, 10:39am

That’s odd. Here is mine:

(I don’t like the stretching though. A KeepAspectRatio option might be useful if it were added.).

davide76 · January 30, 2016, 10:52am

I do not stretch, it’s as if the command worked on the contrary, even reversing the normal direction of the surface.

Mario · January 30, 2016, 10:56am

0netech i got the same of you …swappig U V , but the cylinder is too deformed in this way

davide76 · January 30, 2016, 10:57am

the perpendiculars to the surfaces (reference and target) are upwards. The result seems to be the contrary.
I’m wrong?

Mario · January 30, 2016, 11:07am

It would be helpful if the Pascal 's script “ProjectObjects.rvb” would be implemented as an option in the command to get the same result as MOI

0netech · January 30, 2016, 11:23am

You get a slightly better result if the reference surface is made with UnrollSrfUV command. It looks to me that MOI version is more like splitting the target surface with a circle, and simply extruding it up (it doesn’t work with complex objects though).

There is a bunch of other FlowAlongSrf threads on this board with some interesting solutions concerning stretching.