Transformation of a selected part

[Grumot]

Hello!

I am wanting to rotate a part in a STEP assembly. I use

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myObj = Gui.Selection.getSelection()[0]

to retrieve a reference to the part that I want to rotate.
But then, I am not allowed to do:

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>>> myObj.Shape.rotate(...)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
ReferenceError: This object is immutable, you can not set any attribute or call a non const method

What I finally use, is:

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myShape = myObj.Shape.copy()
myShape.rotate(...)
myObj.Shape = myShape

... but it doesn't sound very clean. Is this code OK? or did I miss the way to directly access the shape?

Thanks!

[ickby]

Hello,

if you want to rotate the shape than your way is correct. However, you should not do that but rotate the whoole part by setting it's placement property. something like this (untested):

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myObj = Gui.Selection.getSelection()[0]
myObj.Placement = Base.Placement(...)

you can use the various Placement constructors to create rotations and translations and also multiply multiple placements to create successive rotations, like:

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myObj = Gui.Selection.getSelection()[0]
myObj.Placement = myObj.Placement*Base.Placement(...)

[Grumot]

I was afraid to directly use the placement since the placement of this part is somehow already very complicated (probably due to the STEP generation from the orginal CAD software). But if we can combine the placements, it is a very good news.

That is exactly the answer I was looking for. Thank you, it seems way much better!

[Grumot]

Hi!

you can use the various Placement constructors to create rotations and translations and also multiply multiple placements to create successive rotations, like:

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myObj = Gui.Selection.getSelection()[0]
myObj.Placement = myObj.Placement*Base.Placement(...)

I ran some tests (yeah... late)
It seems that we should use

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myObj.Placement = Base.Placement(...).multiply(myObj.Placement)

That way does not seem to work when myObj.Placement is already complicated:

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myObj.Placement = myObj.Placement.multiply(Base.Placement(...))

some informations came from viewtopic.php?f=22&t=6228 too

[wmayer]

Yes, if you apply several placements P1, P2, P3, ..., Pn then the final placement is P = Pn * ... * P3 * P2 * P1.