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Hi Heiner, it looks like the problem in your case there is that you've probably enabled the "Projective" option for Flow, which is a checkbox that shows up in the pick target object stage, here:



In order for your case to work properly and to follow along with the steps I had earlier, make sure that checkbox is unchecked. If it is checked then that will enable a different mode for Flow which is called projective mode, and in projective mode it is expected that every ray that shoots out from the base plane should intersect the target object which is not the kind of arrangement you have.

Projective mode is more for beaming on a small shape onto a local area of an object, rather than stretching it all the way across a target surface. For your case here you want the regular "full stretch across surfaces" method so you will want that checkbox turned off. It is off by default for the start of a program session however if you have enabled it during some previous test of using Flow within this same modeling session it will remember the previous state and so that's probably how you ended up with it turned on.

Anyway, if you uncheck that option you should be able to get things to work as in those previously described steps.

- Michael

Hi Heiner, so just as a bit more description of "Projective" mode, the way Flow works with that option enabled is that it shoots out rays from the base plane which in your case results in rays like this:



It is expecting those rays to intersect the target object. But as you can see here there are a large number of rays that do not intersect your target object. In places that do not intersect there will be a kind of default transformation set up, it can tolerate a small number of missed rays but not big broad areas where there are not any ray intersections.

So your case here is not a good candidate for the "Projective" flow mode, you need to use the regular non-projective mode so make sure the Projective checkbox is turned off.

Projective mode works well when you want to place a small object onto a localized area of a larger object something more like this:



- Michael

Hmmm, it seems as if my understandig of "projection" was entirely wrong ...
I have it working now, thanks to you!
Best Regards
Heiner