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From: Michael Gibson
HI Mala,
re:
> Why can't this structure be extruded?
Extrude works on either curves or single surfaces (or also on faces selected on a solid which will automatically boolean with the solid).
Your object is neither of those, it is a "joined surface" made up of 2 surfaces joined together.
To extrude it, select it and run Edit > Separate. Then select the 2 surfaces and run Construct > Extrude.
Since the surfaces are not planar it will default to extruding in the z axis direction which would make a degenerate object so you will need to use the "Set dir" option and pick 2 points to define a valid extrusion direction.
Also note that if you want a result that has uniform thickness you should use Construct > Offset > Shell instead of Extrude. You don't need to separate it first if using Shell.
- Michael
From: Michael Gibson
@pafurijaz
> But why when a face is joined to another they don't have the same normal orientation?
They do, and there isn't any wrong direction on this object.
@Pilou, why do you think there is a wrong direction here?
- Michael
From: Frenchy Pilou (PILOU)
The fact that extrude works for both in the same time only when on face is flipped...
From: Michael Gibson
Hi Pilou,
re:
> The fact that extrude works for both in the same time only when on face is flipped...
It doesn't do that.
Flip can flip the direction of selected curves or a surface or entire joined surface.
It doesn't do anything on a face selection.
Extrude does work on this if one or both faces are selected, without any flipping.
However extruding a face selection also tries to do a boolean with the extrusion and that won't work very well if the object isn't a solid. You can turn off the boolean by setting the "Keep separate" option.
So select one or both faces, use "Set dir" and set "Keep separate", should work - no flipping needed.
- Michael
From: Frenchy Pilou (PILOU)
Thanks for the precisions!
But curious!
From: Michael Gibson
Hi Pilou, that's all normal behavior.
re:
> Just Flip one face
Does nothing
> Select All
https://moi3d.com/4.0/docs/moi_command_reference6.htm#selectall
quote:
If sub-objects are selected, the selection will be limited to other sub-objects. For example, if you have an edge of a solid selected, this will select all edges of that solid and not other objects.
From: Frenchy Pilou (PILOU)
THx for the precision : so a selective selection! :)
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