Transform a Face?

Chris Fullmer

I was wondering if its possible to transform a face? I am able to transform a group, but not a single face. I'm hoping its just me and my syntax issues, but I'm afraid its not possible?

model = Sketchup.active_model
entities = model.selection
entities.to_a
cl_transform = Geom;;Transformation.scaling( 1, 3, 1 )
entities[0].transform! cl_transform

So that is enough to scale a group. But how could I alter it to work when entities[0] is a face? Thanks,

Chris

thomthom

If the answer includes trigonometry and chickens I'm gonna scream...

Jim

In order to transform individual entities such as faces and edges, you need to use the Entities.transform_entities method.

This is closer, but I didn't try it.


model = Sketchup.active_model
entities = model.selection.to_a
# entities.to_a # ! This does nothing to the entities variable. The result (an Array) is simply thrown away.
cl_transform = Geom;;Transformation.scaling( 1, 3, 1 )
entities.transform_entities cl_transform, [ entities[0] ]

Another option would be to group it, transform it, then explode it.

Chris Fullmer

I've been fumbling around with this, and I finally got something to work. It looks like this:

model = Sketchup.active_model
entities = model.active_entities
ent = entities[0]
t = Geom;;Transformation.scaling( 1, 3, 1 )
entities.transform_entities t, ent

That works. It takes the first entity in the entities array and transforms it by my "t" transformation. But I want to apply it to the selection, not the entire model. So I re-write "entities = model.active_entities" to

entities = model.selection

and it no longer works. Returns this error:

(eval):6:in ‘initialize’: undefined method ‘transform_entities’ for #Sketchup::Selection:0xba333f0

So what am I missing? It works when entities points to the entire active model, but not when it only points to the selection.

Chris

todd burch

Chris, this gets back to your question the other day about "Are Entities Arrays?". Same thing here. A "Selection" is not an "Entities" or an "Array". It's actually even a bit further removed from an Array than Entities is. ("Entities is"... sounds funny to me).

Anyway, you can do what you want by adding the .to_a to the end of the selection, like this:


Sketchup.active_model.entities.transform_entities(  t  , Sketchup.active_model.selection.to_a  )

The .transform_entities takes an Entity, an Entities, or an Array of entities as input.

Todd

Chris Fullmer

Hey Todd, that works indeed! Immediately preceeding the .transform_entities needs to be sketchup.model_active and not model.selection. Perfect. Unfortunately I think I am in over my head with transforming for now. I'll have to devote some time to figuring out the rest of this. I was hoping that I could scale a face to be smaller by 50% or 10%, etc, and have the tranformation apply itself to the face follwing the faces axis or normal (or whatever the correct term is). So, give me some time and I'll be back hopefully to figure the rest of this out. One question though, in the line

t = Geom;;Transformation.scaling( 1, 2, 1 )

How dp you get it to scale to a .5 value, for example? How what do you input to make it scale itself smaller?

Chris

todd burch

Hey!! You said

@unknownuser said:

But I want to apply it to the selection, not the entire model.

so I answered how to do it from the current selection.

Kids these days... sheez.

Ok, about your scaling question... Without testing it, probably


t = Geom;;Transformation.scaling( 0.5, 0.5, 0.5 )

Todd

Chris Fullmer

@unknownuser said:

Hey!! You said

@unknownuser said:

But I want to apply it to the selection, not the entire model.

so I answered how to do it from the current selection.

Kids these days... sheez.

I think I wasn't clear in my post.

@unknownuser said:

Immediately preceeding the .transform_entities needs to be sketchup.model_active and not model.selection

I was correcting my own poor logic, not anything you wrote. Your code worked perfectly and was tailored to what I asked for. Thanks for your help, and the help of everyone else on here!

I'm serisouly not used to coming on to the SketchUp forum and asking for help with stuff that I know is beginner stuff. SketchUp I understand. Ruby is sort of kicking my tail, but I'm optimistic. So I'm desperately trying to balance asking for help and not wearing out my welcome So a big thanks again to everyone who helps us wannabe Ruby programmers.

Chris