Hi Mario,

> if we assume that rectangular extent of the pattern is of 2:1
> proportion, then shorter side is projected along equator and
> longer side is projected along meridian.

Do you mean that the result is rotated 90 degrees from what you need?


> can we control this? i have tried rotating pattern and target
> and it does not seem to have any effect.

You can control it by manipulating the base plane - if for example the result is rotated by 90 degrees from what you want, that means that one of the surfaces has their U and V directions swapped from what you need.

So to fix that up you need to swap the U and V directions of your base plane - you can do that by rotating it around its diagonal by 180 degrees and then scaling it.

In the next v3 release that won't be necessary anymore since it will automatically swap or reverse any U V directions on the surfaces as necessary to align the corners nearest to which you pick on the surfaces.

But for now manipulating the base plane is how you control it. When you manipulate the base plane you leave the objects you are going to deform alone and just change the plane, don't rotate the whole set of both base plane and objects together - if you do that there will be no change since it's how the objects relate to the base plane that is controlling things.


Basically the way that Flow works is that for every point on the objects that are being deformed it finds the closest point dropped down on to the base plane. That produces a UV coordinate in the UV space of the plane, and an offset distance for how the point is above or below the plane. Then that same UV point is evaluated on the target surface, and the same offset distance is applied.

So basically Flow works by going from the UV space of one surface into the UV space of a different surface.

Every NURBS surface is made up of a rectangular grid of control points, and one direction of the grid is the U direction and the other is the V direction.

- Michael