topic Transformation inverse problem in Revit API Forum

Transformation inverse problem

Anonymous — Thu, 30 Jul 2015 08:13:55 GMT

Hi,

I found a bug in Transform.Inverse.

I am using Transform.Inverse on this matrix : [ 0 1 0 -29.3 ; -1 0 0 3; 0 0 1 -0.73; 0 0 0 1] and the result is : [0 -1 0 -3 ; 1 0 0 -29.3 ; 0 0 1 0.73 ; 0 0 0 1].

According to matrix inverse calculuation the result is [0 -1 0 3 ; 1 0 0 29.3 ; 0 0 1 0.73 ; 0 0 0 1].Also using the formula for transformation inverse :

http://www.cg.info.hiroshima-cu.ac.jp/~miyazaki/knowledge/teche53.html , the result is the same [0 -1 0 3 ; 1 0 0 29.3 ; 0 0 1 0.73 ; 0 0 0 1].

Solved.http://help.autodesk.com/view/RVT/2014/ENU/?guid=GUID-78445211-E211-4E27-B080-BE9FA3C50631

Re: Transformation inverse problem

jeremytammik — Tue, 11 Aug 2015 12:34:54 GMT

Thank you for letting us know that it is solved.

However, the link that you posted does not work for me.

What section of the help file are you pointing to, please?

Re: Transformation inverse problem

Anonymous — Tue, 11 Aug 2015 13:23:02 GMT

Hi Jeremy,

I'm pointing to:

Revit API Developers Guide -> Revit Geometric Elements -> Geometry -> Geometry Helper Classes.

Have a nice day

Re: Transformation inverse problem

jeremytammik — Tue, 11 Aug 2015 14:36:42 GMT

Dear Daniel,

Thank you for the detailed path.

For Revit 2016, that leads me to

http://help.autodesk.com/view/RVT/2016/ENU/?guid=GUID-78445211-E211-4E27-B080-BE9FA3C50631

Wow. I just tested that link, and that one does not work for me either.

Strange.

I reported the error to the powers that be.

Another question, though:

How did that help solve the problem for you, please?

Thank you!

Cheers,

Jeremy