Move a Transformation.rotation object to x, y and z position

kimpastro

Hi everyone,

just need to move a Transformation.rotation, to another X, Y point.

My Code:


vector = Geom;;Vector3d.new 0,0,1

#rot_z came from jSON, here he's an Integer 45
t_rotation = Geom;;Transformation.rotation ORIGIN, vector, rot_z * Math;;PI / 180

Alright, have this code, but now I need to move this guy above to a new position:


#pos_x, y and z came from an imported jSON.
point = Geom;;Point3d.new pos_x, pos_y, pos_z
t_position = Geom;;Transformation.new point

I've tried:


t_rotation = t_rotation.set! t_position

And after all that, I put entities into model, like that:


entities = Sketchup.active_model.active_entities
instance = entities.add_instance loaded_module, t_position
$dc_observers.get_latest_class.redraw_with_undo instance
Sketchup.active_model.materials.purge_unused

*loaded_module is:


loaded_module = Sketchup.active_model.definitions.load_from_url uri
loaded_module.set_attribute 'dynamic_attributes', 'front', 'black_color'
etc...

And tried a lot of other combination with Transformation...

This structure of classes and instances in Sketchup is just so confuse to me. Don't know who is parent of who, the Ruby API is very poor and misterious... I work with web app dev, not sketchup.. and this thing is hurting my brain. lol.

Well... that's it. Thank you all.

TIG

Sorry, but your code is full of holes...
Try

#rot_z came from jSON, here he's an Integer 45
t_rotation = Geom;;Transformation.rotation(ORIGIN, Z_AXIS, rot_z.degrees)

Now

#pos_x, y and z came from an imported jSON.
point = Geom;;Point3d.new(pos_x, pos_y, pos_z)
t_position = Geom;;Transformation.new point

So far so good...

tr = t_position * t_rotation

to combine them into one Transformation...

entities = Sketchup.active_model.active_entities
instance = entities.add_instance(loaded_module, tr)

Assuming loaded_module is a valid definition...
It is placed with the rotation and point as expected...
Alternatively do it in two steps - at as point, then rotate it...

instance = entities.add_instance(loaded_module, t_position)
instance.transform!(t_rotation)

You are actually making this more convoluted and awkward than it really is
No need to involve DC code at this stage...

kimpastro

@TIG, thanks a lot man.. that clarify a lot of things now.

but, still having some issues.
All that code is inside of an 'each' block.. so actually he'll place N entities on the module and

Well.. while I was writing that above, I've tried another thing, and this works:


instance = entities.add_instance(loaded_module, t_rotation)
instance.transform!(t_position)

but this don't:


instance = entities.add_instance(loaded_module, t_position)
instance.transform!(t_rotation)

The both generate modules and put they in the model, but the second option rotate the entity like... earth and sun, not in your own axis.

and i need $dc_observers because i'm using texture in these guys, and before setting dynamic_attributes i'm loading textures and setting up to them, and need to redraw to apply (at least, that's a solution I've founded).

PS: don't know if i'm using the correct terms for elements like: model, entity, modules, etc. Sorry about that.

TIG

If you rotate it then position it ... the object is assumed to be placed at the ORIGIN and then rotated about the specified point - originally set as the ORIGIN, then it is positioned where your specify it to be.
BUT...
If you position it then rotate it ... the object is positioned where you specify, and it is then rotated about the given point - and in the original transformation that was set as the ORIGIN, so the rotation might appear weird as the object is NOT rotated about its insertion point.
But if you choose that order of operation, and you were to recast the rotation transformation to specify the actual insertion point used in the positioning transformation it will work.

If you think about doing this manually...
1: Place at ORIGIN, rotate about ORIGIN, move to new position...
gives a different result from...
2: Place at ORIGIN, move to new-position, rotate about ORIGIN.
BUT with...
3: Place at ORIGIN, move to new-position, rotate about new-position.
the result is the same as 1: !

If you combine the transformations into one used in the add_instance -- using * then
trans = trans_p * trans_r
-- should work as the combination order is read right-to-left...

Dan Rathbun

@kimpastro said:

PS: don't know if i'm using the correct terms for elements like: model, entity, modules, etc. Sorry about that.

Yes you are misusing the term module.

In your examples, "loaded_module" is a "loaded_component_definition".

module is a ruby keyword, and a block of code that forms a namespace.

kimpastro

Alright, understood.
Thanks a lot TIG and Dan for all information. you guys are awesome!!!

kimpastro

@dan rathbun said:

@kimpastro said:

PS: don't know if i'm using the correct terms for elements like: model, entity, modules, etc. Sorry about that.

Yes you are misusing the term module.

In your examples, "loaded_module" is a "loaded_component_definition".

module is a ruby keyword, and a block of code that forms a namespace.

Thanks, I'll be careful next time.

I'm confusing about module because we use the same term to determine the "master entity" of our projects to our clients.