topic Re: how to rotate a FamilyInstance around 3 axes in Revit API Forum

how to rotate a FamilyInstance around 3 axes

dirk.neethling — Tue, 08 Aug 2017 20:56:42 GMT

Can anyone please show me how to rotate a FamilyInstance derived from Metric Generic Model.rft about the 3 axes?

Re: how to rotate a FamilyInstance around 3 axes

Anonymous — Wed, 09 Aug 2017 08:49:13 GMT

Hi dirk,

You can use like this

Let say familyinstance =fin

1st : Get Family Instance Location point (LP)

2nd : Now create unbound line according to direction(X,Y,Z) Like.

     XBasis=Line.Create(LP, fin.GetTransform().BasisX)
     YBasis=Line.Create(LP, fin.GetTransform().BasisY)
     ZBasis=Line.Create(LP, fin.GetTransform().BasisZ)

3rd : Rotate Element

     ElementTransformUtils.RotateElement(document, element.Id, XBasis,Angle)
     ElementTransformUtils.RotateElement(document, element.Id, YBasis,Angle)
     ElementTransformUtils.RotateElement(document, element.Id, ZBasis,Angle)

Note: Can you explain more about "derived from Metric Generic"

This may help you

Re: how to rotate a FamilyInstance around 3 axes

dirk.neethling — Wed, 09 Aug 2017 08:57:45 GMT

"derived from Metric Generic" just means I use the "Metric Generic Model.rft" template to generate the Family.

Re: how to rotate a FamilyInstance around 3 axes

Anonymous — Wed, 09 Aug 2017 09:04:04 GMT

Oh,

I think you derived metrices for rotation.

I hope this will solve your issue.

Re: how to rotate a FamilyInstance around 3 axes

paulight — Fri, 18 May 2018 19:19:12 GMT

Singh,

Your code lines are simple and good. What program are you coding in?

Thanks!

Re: how to rotate a FamilyInstance around 3 axes

ivo.lafeber — Wed, 07 Feb 2024 07:59:09 GMT

where do you get the Angle which is used in ElementTransformUtils.RotateElement(document, element.Id, XBasis,Angle) ?

Re: how to rotate a FamilyInstance around 3 axes

jeremy_tammik — Wed, 07 Feb 2024 09:43:05 GMT

> where do you get the Angle... ?

I would guess from the same place as you, when you ask how to rotate a FamilyInstance around 3 axes... What rotation? Which axes?

Neither the question nor the answer specify any details, so the answer matches the question well.

Orientation in 3D space requires you to provide some pretty specify input in order to be able to discuss it at all, cf.,

https://duckduckgo.com/?q=orientation+3d+space

Re: how to rotate a FamilyInstance around 3 axes

sragan — Wed, 07 Feb 2024 21:00:45 GMT

Not really a programming comment, but let's also not forget 3D rotations are not commutative.

Rotating around one axis and then another is not necessarily the same as rotating around the second axis and then the first.

It's almost like adding 2+3+4 and then adding 2+4+3 and getting different answers.