I have two objects (rectangles, 1.5" x 3.5" x 24", not that this matters). I create the first one and group it. As expected, entity info tells me it is a solid group, ok, no surprises here. I move/copy and create a second instance (entity info reports solid group, 2 in model). It is also a solid group. I join the two individual solid groups and create a new combined group. This new single combined group is reported as a plain group, not a solid group. I then explode the combined group and again have two solid groups, but this time entity info reports each solid group as 1 in model.
Still with me? Now the questions:
So, why after the grouping/ungrouping did the two single solid groups become unique when they started as identical?
Is it possible to have two objects (each an individual group) combine to form a single solid group?
Thanks in advance for your help !
Another twist …
If I copy/paste, then after exploding, the individual groups are back to being identical. Entity info reports each as 2 in model. Strange !
SketchUp does not consider a container (group or component) with nested groups to be a solid. Depending on what you will do with the model, that might or might not matter. For example, some slicers for 3D printers are happy with nested groups.
Any edit of either group will cause them to become distinct. I’d have to guess that nesting them and then exploding the container was deemed to be an edit. Can’t explain the twist, though.
Edit: on further check, I can’t reproduce the made unique effect either. I made a box, made it a group, used move-copy to get two, grouped them, and then exploded the container group. I get back two copies of the same solid group.
A Solid Group or Solid Component may contain one or more separate airtight solid vessels.
But it must all be raw geometry. No nested Groups or Components.
A Solid in SketchUp is a single Group or Component whose geometry meets certain conditions.
When those conditions are met, Entity Info indicates the model is a Solid Group or Solid Component.
Also notice Entity Info indicates the Volume of a selected Solid.
• The geometry must form a single* airtight vessel.
Like a perfect soap bubble … •No gaps •No holes •No leaks
• No extraneous Faces** inside or outside the vessel.
All Faces must serve to enclose the singular volume of the vessel.
• No stray Edges.
All Edges must serve to support a Face that in turn serves to enclose the airtight vessel.
Thus, each Edge supports two Faces … no more, no less.
• No nested Groups or Components.
*A Solid Group or Solid Component may contain one or more separate airtight vessels.
**Best that all Faces are oriented Front Side (white) facing out.
I use the Medeek extensions. These extensions create nested groups. I find models where I have to edit the nested groups. Once I make the edit, the extensions will no longer see the entity as it’s own, and I cannot use the robust editing tools of the extension. More so, when exploded, the entities lose their solid characteristic, and the solid tool set within the extension will not work.
When you say you joined them, do you mean they are intersecting each other? That would stop it counting as a solid unless you made an outer shell of the combined object.
Another thing that could be happening is you have tiny faces that can exist in the group, but are lost when you explode it and it will never count as a solid again. If that’s the case you’d have to scale it up, then down again to avoid this.
Could you show us the actual objects you’re using?
Box and McGordon, I did not save the file. The two objects were simple rectangles (described in original post above). Actually I was thinking about two 2x4s. I joined them by intersecting one common side via move.
Sort of a similar problem here. I can make solid groups and/or solid components from the individual “pieces” of this model, but when I explode all and try to make a solid group/component out of all, i am unable to make it a solid, thanks for any help!
Edit: Wait a minute! Just tried Outer Shell and it worked to make everything one complete solid!