Geom::Transformation.rotation

confitex architure

Hello again,
I'm trying to explore how to insert and rotate an external component. But I can't figure out how geom::Transformation.rotate works...
I can't manage the rotation point... If I set inspoint at 0,0,0 and destpoint at 0,0,0 it works fine.
but if I change inspoint and destpoint it doesn't rotate the component around it.
So I tought I could do it in 3 steps.

I insert component in 0,0,0 (transform)
I rotate it (transform2)
I move to another point (transform3), but then the operation redefine the 2nd step and turn back to its originel orientation.
Any solution?

def insertrotate
	zaxis = Geom;;Vector3d.new(0,0,1)
	inspoint = Geom;;Point3d.new 0.cm,0.cm,0.cm
	destpoint = Geom;;Point3d.new 100.cm,100.cm,0.cm

	transform = Geom;;Transformation.new inspoint

	model = Sketchup.active_model
	entities = model.active_entities

	path = Sketchup.find_support_file "a_file.skp" ,"a_directory_under_sketchup_dir"

	definitions = model.definitions
	componentdefinition = definitions.load path

	instance = entities.add_instance componentdefinition, transform

	transform2 = Geom;;Transformation.rotation(inspoint,zaxis,90.degrees)

	transform3 = Geom;;Transformation.new destpoint
	
	UI.messagebox "Applying a new Transformation (in this case, a rotation)"
	status = instance.transformation=transform2

	UI.messagebox "Applying a new Transformation (in this case, a move)"
	status = instance.transformation=transform3
end

todd burch

I can't look at this now, but if you don't get a solution before I do have time, I'll be happy to work it out for you.

I'm the rotation transformation king, you know.

Todd

confitex architure

Thanks Todd,
Glad I found the Geom::Transformation.rotate's key master.
It seems there's no other... I'll wait for your help

To all others:
if I don't get an answer on december 24th, feel free to help me, I'm sure King Todd will not be upset.

confitex architure

I found it but do not really understand the reason why I must use .transform! instead of .transformation= ... (Todd?)
So to rotate around the perfect insertion point of the component, type:

   UI.messagebox "Applying a new Transformation (in this case, a rotation)"
    instance.transform!(transform2)

instead of:

   UI.messagebox "Applying a new Transformation (in this case, a rotation)"
   status = instance.transformation=transform2

Hope this will help others.

todd burch

Glad you worked it out.

I'll try to explain the difference between the two.

instance.transformation= is used to build a new transformation only. The return value is a transformation that can be applied to an object.

instance.transform! actually applies the transformation you pass; it doesn't just create a new definition of a transformation like the above does.

An analogy might be English terms. instance.transformation=, is the imperative to get a noun. instance.transform! is the imperative to perform the action - the verb if you will.

Ok, so maybe that analogy is poor and is completely incorrect in proper terms of English....

Todd

Jim

@unknownuser said:

Glad you worked it out.

I'll try to explain the difference between the two.

instance.transformation= is used to build a new transformation only. The return value is a transformation that can be applied to an object.

instance.transform! actually applies the transformation you pass; it doesn't just create a new definition of a transformation like the above does.

An analogy might be English terms. instance.transformation=, is the imperative to get a noun. instance.transform! is the imperative to perform the action - the verb if you will.

Ok, so maybe that analogy is poor and is completely incorrect in proper terms of English....

Todd

It's a pretty good analogy. I think of them as:

**transformation=**set the transformation (absolute)
tranform! apply the transformation (relative)

confitex architure

Not realy clear for me yet.
If I understand well, that means "transformation" is usefull for add_instance (f.e.) A kind of insert definition

   transform1 = Geom;;Transformation.new inspoint
   instance = entities.add_instance componentdefinition, transform1

and "transform!" to modify this instance.

    instance.transform!(transform2)

But I'll get use to it.
Thanks both of you for your help.