Compound Transformation Rotation Problem

I have a problem and the source might well be me, but I see no logic behind the way my definition fails.

My intention is to create a series of breps along with a series of transformations. Each transformation can be used to place the next brep in a relation to it´s predecessor.

Then I compound these transformations but with the help of a split list so each brep gets one more of the transformations compounded than it's predecessor.

This is all fine if each brep is identical OR if i don´t include any rotation in the transformation - in that case I can give each brep AND transformation individual properties and still keep my intended behaviour.

The transformation is produced through the orientation between xy and a custom plane on the brep.

Please help me out here! I'm not sure if this is a bug or just my poor knowledge of transformations, but then again - the concept works if I exclude the rotations.

//Fr..

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Compound Transformation Problem 2.gh, 12 KB

Replies to This Discussion

Permalink Reply by Frans Magnusson on January 17, 2013 at 2:47pm

Anyone having the same problem with compound transformations?

Permalink Reply by David Rutten on January 20, 2013 at 6:05am

I don't get it, it seems to work here with identical and different breps and with or without a rotation. Perhaps I misunderstand the problem though.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Frans Magnusson on January 20, 2013 at 6:52am

First of all, thank you for even responding to me on a sunday and with such short notice!

What I want to do is to avoid what I did in the lower part of the definition, that is iteration by copy paste. Maybe this proof of concept only proves that this is impossible? As I said, I am in no position to scream bug, maybe this is the way transformations work.

What intreagues though is the way the definition partially works the way I imagined...

Description: There is a difference between the two approaches in the definition which I hoped would generate the same result - but only when rotation set to non-zero and with breps of different properties and only in compounded transformations

I hope this clarifies my worries.

//fr..

Attachments:

Compound Transformation Problem 3.gh, 44 KB

Permalink Reply by Frans Magnusson on March 19, 2015 at 7:08am

So bringing this issue up again.

In this definition I want to orient a list of trapezoid polylines so that they align their long edges. Should this be possible using compound transformations?

The definition handles orthogonal panels exactly the way I want, but the trapezoid shape introduces rotation which screws everything up.

Best.

Frans

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