Entities.add_group bug?

thomthom

TIG: It's safe to group entities as long as they are in the same context, right? To move the face, why not group it, get it's definition, then place a new instance in the destination context and erase the old.
Avoiding having to manually recreate the faces with its loops and UV mapping etc....

voljanko

@thomthom said:

To move the face, why not group it, get it's definition, then place a new instance in the destination context and erase the old.

Can you give the code sample,please(how to group it).I would like to test it.

voljanko

It's working!!
I cannot believe it.I have a theory that nothing can work without testing.You are breaking this theory

thomthom

I always get uneasy when a code is run the first time without any errors...

TIG

It's only 100% safe to make a group directly with
ents.add_group(an_entities_array)
[or (an_entity)]
if the 'ents' is the model.active_entities OR the same 'entities context'
Doing it across a mix of 'entities contexts' can cause Bugsplats ???
So then you normally make an empty group
group=ents.add_group()
and then add the entities to its group.entities; either by cloning raw geometry etc; or if it's a component, by using
instance2=group.entities.add_instance(instance.definition, instance.transformation)
or if it's a group, by using
group2=group.entities.add_instance(group.entities.parent, group.transformation)
If you are not immediately erasing the original 'group' then run group2.make_unique on the new group because, otherwise they as as if they are components - changing one changing one changes the other - behavior not expected in groups which ought to only ever have one instance of their definition.

TIG

If making a temp group of the face in situ works for you and you can then add an instance of that into another context and explode it and then erase the original face-group then that's good ... but if it splats you need to do it by 'cloning'

voljanko

@thomthom said:

I always get uneasy when a code is run the first time without any errors...

Reading your code, the line

group.erase

makes me curious because the erase should be with the !.
So I discover that it was only half the code working.
But the result is ok.
So the working code is:

def move_face(face, destination_entities )
  source_entities = face.parent.entities
  entities = face.edges << face # I think you need to include all the edges related to the face
  group = source_entities.add_group( entities )
end

So the untested code theory remains
I will test it more,because of the Bugsplat fear.

TIG

You need to add the
###... definition = group.entities.parent transformation = Geom::Transformation.new # Adjust to place where you want it. copy = destination_entities.add_instance( definition, transformation ) copy.explode # Ungroup the copied face group.erase**!** # Erase the original temp group
otherwise all your code does is move the face into a group that is in the in the same context the face was. I thought your aim was to move the face into another group ?
The method move_face( face, destination_entities ) takes the two arguments 'face' - the face to move; and 'destination_entities' - where you want it to end up - e.g. group2.entities...
Thomthom's clever face>group,add_instance,explode,delete_original idea should work in this set of circumstances, without recourse to cloning...Note that this method 'moves' the face, and leaves it un-grouped - just as it was originally but now within another entities-context - if you want to copy the face into a group then the code needs tweaking - instead of deleting the original face [that's been grouped] with group.erase! you use group.explode to return the original face to its un-grouped state.

thomthom

<span class="syntaxdefault"><br />def move_face</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> face</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> destination_entities </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  source_entities </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> face</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">parent</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities<br />  entities </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> face</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">edges </span><span class="syntaxkeyword"><<</span><span class="syntaxdefault"> face </span><span class="syntaxcomment"># I think you need to include all the edges related to the face<br /></span><span class="syntaxdefault">  group </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> source_entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">add_group</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> entities </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  definition </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> group</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">parent<br />  transformation </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Geom</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Transformation</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">new </span><span class="syntaxcomment"># Adjust to place where you want it.<br /></span><span class="syntaxdefault">  copy </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> destination_entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">add_instance</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> definition</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> transformation </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  copy</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">explode </span><span class="syntaxcomment"># Ungroup the copied face<br /></span><span class="syntaxdefault">  group</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">erase</span><span class="syntaxkeyword">!</span><span class="syntaxdefault"> </span><span class="syntaxcomment"># Erase the original temp group<br /></span><span class="syntaxdefault">end<br /></span>

Note: completely un-tested. Just a theory

voljanko

Grrr,it is only working if the group is edited (so in the same context).
Otherwise strange behaviour and Bugsplat anytime.

TIG

As I suspected then...
Using ents.add_group(ent_array) only works safely if ents==model.active_entities
So use my cloning tips...