Rotation unexepected result

[2000apacman]

Hello, i would like to script a dragon curve so i first wrote this :

` mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
point1 = [0,0,0]
point2 = [1,0,0]
point3 = [1,1,0]
group0 = Sketchup.active_model.entities.add_group
line = group0.entities.add_line point1,point2
line = group0.entities.add_line point2,point3

t0 = Geom::Transformation.rotation( [1, 1, 0], [0,0,1], 90.degrees)
group1 = group0.copy
group1.transformation = t0

group2=group0.parent.entities.add_group([group0, group1])

t1 = Geom::Transformation.rotation( [2, 0, 0], [0,0,1], 90.degrees)
group3 = group2.copy
group3.transformation = t1

group4=group2.parent.entities.add_group([group2, group3])

t2 = Geom::Transformation.rotation( [2,-2,0], [0,0,1], 90.degrees)
group5 = group4.copy
group5.transformation = t2`

But the thrird rotation gave me unexepected result. It seems to be a rotation and a translation.
Why?

[2000apacman]

I found the correction myself.
And I use:

group1.transform!(t0)

instead of:

group1.transformation = t0

But if someone can explain to me why this works with transform! but not with .transformation
i would be thankful.

[jolran]

Transform! executes/calls the method wheras transformation = is assigning it.

tested your code and
transformation = , did give me a same result as transform!

The principle still is call method with object.method.

Oh, and to answer the question. In this case were dealing with Geom::Transformation object. So were not calling a method directly(I think..).So its more like

Group.Geom::Transformation = myspecial.Geom::Transformation

I hope I explained it correctly..

If you test t0.class you will see it's a Geom::Transformation.object