What are exactly conditions the for make a "Joint"?
Seems very difficult on a sphere!

Hi Pilou, do you mean to use the "Join" command?

For surfaces, join will work to glue together unattached edges between 2 surfaces if the edges are at least within 0.005 units apart or closer to one another.

But maybe with your surfaces in your model here you are trying to use the "Blend" command to create a connecting piece?

If that is the case, then there are some curves and some flat pieces in your model here that are kind of getting in the way, if you delete those then it will be easier for you to pick the correct edge. If you pick a generator curve instead of an edge of a surface, that can prevent getting an edge to edge blend working properly.

Please try the attached version, where I have deleted some of that overlapping curve geometry to make it easier for you to pick the edges.

- Michael

Yes it's Blend ! Sorry Joint is the French command :)

So Blend is always possible Open volume or closed volume?

Hi Pilou - Blend actually is easier to use on a open surface rather than on a closed volume.

It actually works on any edge, but with a closed volume an edge is shared to belong to 2 surfaces, not just one surface. So when blending with an edge of a closed volume, it is not predictable which of those 2 surfaces will be the one used for the alignment.

When you have an open surface with an edge that is not joined between 2 surfaces, then that edge belongs to only a single surface so that makes it easier to understand which surface the blend will align with since there is only one to choose from.

Other than that, one problem that is easy to run into with Blend is if you have generator curves overlapping exactly on top of the surface edges - if you want to do an edge/edge blend you need to select the edge and not the generator curve so it is good to hide or delete the generator curves in this case so you can expose and more easily pick the edge rather than the generator curve that is positioned exactly on top of it.

- Michael

ok :)
And other thing: how do make for know that some curves or volumes are overlaped?

Hi Pilou,

> And other thing: how do make for know that some
> curves or volumes are overlaped?

For surfaces, you can see that there is an adjacent face there because it will be a shaded-in area rather than an empty area.

So for example in your original model you posted, you had a surface here:



You can see that there is a surface there due to the shaded filled in area rather than an empty area... I deleted those surfaces in the updated file that I posted, so that it was easier for you to select the edge of the surface you wanted to blend with.

If you have a curve overlapping a surface edge, you can tell that by moving the mouse over top of it with the surface not selected - normally to select an edge you must select the surface first. If you see something that looks like an edge being highlighted when you move the mouse over it, but you have not selected the surface, then that is how you can see that there is a generator curve there.

- Michael

Ok I see that was my errors and can remake your repair :)

So why curves generator have the same color (selected or not) than the other curves by default?
It will be not more easy to distinguish them?

Hi Pilou,

> So why curves generator have the same color (selected
> or not) than the other curves by default?
> It will be not more easy to distinguish them?

I've tried to avoid having too many things of different colors by default - if you don't understand what the colors mean, it can be confusing.

Also too many default colors then becomes incompatible with using a colorizing system as user-choice method of organizing objects.

So there can be some bad effects from doing that.

My best suggestion currently is that you should try and "clean" up your generator curves after you have created a surface from them. They are generally selected after you have created a surface and that is a good time to hide or delete them to get them out of the way.

- Michael

< you should try and "clean" up your generator curves after you have created
yes :)

A little question again : generator curves are not in the browser?

Hi Pilou,

> A little question a gain : generator curves are not in the browser?

Yes, they are just regular objects so they are in the browser the same as any object.

One easy way to hide them all with the browser is to go to Types / Curves and click the eye icon on that entry to hide all curve objects.

- Michael

Thx for all these explanations!

About Blend again

cylinder and a box : works with one segment, not more

Does normaly same numbers of segments in each object to blend?

Box and box : one by one yes, but not 4 *4 (4 segments of a facet)

oooops!

Hi Pilou,

> Does normaly same numbers of segments in each object to blend?

Yes, that's currently a limitation of Blend, that you can only do it between 2 edges at a time.

I'd like to remove this limitation in the future, but for now to get a result between a cylinder and a box like you show there, you would want to select the cylinder's edge curve and use the Trim command on it with "Add trim points" to break that edge into 4 sub edges, then you would have a compatible edge structure on the end of the cylinder for blending to the box.

- Michael

Joint!

Joint!!!!

Joint!!!