Hi Leonard, that's odd - I can't seem to repeat that last "edges not showing up" problem over here...

Over here when I open up your previous file (Clerestory chamfer problem.3dm) and select all the curves on the left, and then extrude, I get this:



which seems to have all edges in place.

In your screenshot, there must be an edge there since it has the proper shape in that spot.

Have you possibly hidden some of the edges? It is possible to hide edges the same as you can hide regular objects - if you have some edges selected and then push Edit/Hide, they will get hidden from view.

Please try pushing Edit/Hide with nothing selected to show everything and see if that brings your edges back again.

The original problem definitely seems to be a bug where Chamfer is not trimming things properly though, there is plenty of space for your chamfers to fit.

- Michael

Hi Leonard, I also think I'm understanding a bit more about how you want to use "straight corners" in this case.

So to use straight corners, the little side connecting edges will need to be unselected.

These ones I mean:



Because if those are selected, chamfer or fillet will try to build a surface there and then you can't have straight corners enabled because of this kind of situation:






When a side piece is getting filleted/chamfered, then "straight corners" won't really work anymore because as you can see above the fillets/chamfers do not all intersect with one another and there would be a hole.

So instead you want to avoid selecting those little edges.

In this case you would not want to use Invert (that can come in handy in other situations though), but instead use a strategic window selection to grab things.

To do that, you select just one edge to start with. Once a single edge is selected, then a window select will grab other edges inside of it. So in this case after selecting one edge you would go to the top view, and do 2 window selects like this (note starting on the left and moving towards the right):



Then switch back to the 3D view and deselect the outermost edges that you don't want to have chamfered by clicking on them individually to deselect them.


- Michael

Hi Leonard, until I figure out what is going wrong with chamfer in this case, probably the best way to complete this would be to use a combination of Offset + Loft instead.

To do that, you go through those current curves you have an offset them to the inside by your chamfer distance, like 0.25 inches I think you were using.

So that gives you this:



Then you move one set of the curves backwards by 0.25 units, so that they are staggered from one another like this:



Then you go through and select matching pairs of curves, and run construct / Loft (with cap ends option off) to build the chamfer pieces like this:



After those are all built, switch to the Top view and do a window select to grab all the curves for the front part, like this:



Then run Construct / Planar to build a planar cap surface through those.

At this point the front piece and the chamfers are all built, you can join those together.

Then mirror it to make the back part, (this much is in the attached 3DM file) and then to complete it you'll need to select pairs of edges and use Loft to build the side wall pieces which then can all be joined together.

This should at least allow you to finish the model with your originally desired sizes.

I'm not sure yet why Chamfer is having so many problems with this situation, I'll see if I can figure anything out about that but that may take a few days or so before I know any more about that.

- Michael

Hi Michael,

Let me address some of your responses.

After four straight attempts, I am still getting edges I cannot highlight. I did what you suggested but no joy. I have enclosed a pic of the extrude with the edges I could click on highlighted. The rest of the edges in that pic would not activate. I have attached the file of this latest iteration. The workaround I used was to go back to extrude as I noted here some posts ago. Pics 17 & 18 show the chamfers after the .obj files were dropped into Cinema 4D.

Regarding the "little side connecting edges", I did not include those for the chamfer.

Thanks for the strategic window tip. Good one that will be used frequently.

Regarding the chamfers, I followed BurrMan's suggesting of backing off from .25. The best I could do was .17 and decided to leave it at that. Interestingly, the door rectangular openings accepted the .25 and straight corners just fine.

Thanks for your help.

Leonard

Hi Leonard, thanks for attaching that file "Clerestory edge problem.3dm".

When I load that file I can definitely see that you have some edges not displayed there.

But they do seem to exist and are just hidden. If I click the Edit/Hide button located in the UI here:



immediately after loading your file, the edges are unhidden and then can be seen and picked.

What happens if you follow these exact steps:

1 - load your just attached file Clerestory edge problem.3dm

2 - push that hide button

Do you then see the edges?

- Michael

Hi Leonard, also I've been examining the chamfer problem some more - it seems to be a general bug in how chamfer handles the "corner patching" pieces when 2 edges meet each other at an angle of less than 90 degrees like when you have a triangular shaped hole.

I've been able to repeat the problem when making a simple triangular hole in other simple models separate from yours.

I may need to send it in to the people who make the geometry library that I use, but identifying a general pattern to the problem can help to isolate it down.

- Michael

Hi Leonard,

> Interestingly, the door rectangular openings accepted the .25
> and straight corners just fine.

Yeah, it seems that edges that meet at 90 degrees or higher are handled fine, it's the ones sharper than that from triangular holes that are not handled properly.

Let me know if you would like me to cook up a version with the .25 value, using that alternate method Offset + Loft method. I can complete that partially finished version that I posted earlier if you want.

- Michael

Hi Michael,

Yes the Edit/Hide button reveals the edges but I think that it is actually turning on and using the original or generating curve and not using just the solid's edges. This is what I did using the file I sent you:
1. Assign the solid an Object name. I used "Solid".
2. Turn off Object "Solid".
3. Turn on Object "Spline clerestory all crvs".
a. You can see there are strange curve remnants along with the original generating curve (pic below).
b. Click on the outer most semi-circular curve (or pie shaped) and then note that the window in the upper right corner indicates that what has been activated is a solid, not a curve.
c. Under the Object list, the "Spline..." has a full eye and "Solid" has half an eye. Doesn't that mean that "Solid" is partially on? I noticed that the half eye occurs a lot when extrude has been used.
1) clicking the half eye turns on "Solid".
2) "Spline..." should still have a full eye.
3) turn off "Spline..."
4) the solid that is left has numerous edges that cannot be activated.

I thought that once the extrusion was created, the generating spline was redundant and could be deleted. I have done that without causing problems.

Leonard

>Let me know if you would like me to cook up a version with the .25 value, using that alternate method Offset + Loft >method. I can complete that partially finished version that I posted earlier if you want.

Michael,

Thanks for the offer but that is not necessary at this time. If I need it, I will complete yours.

Leonard

Hi Leonard, thanks for posting more details on your edge hiding problem.

What you're running into there is a bug where the name property of the original generating curve is actually being transmitted to some but not all of the edge curves of the resulting solid.

So once they have the same name, they all get turned on or off when using that same slot in the "Objects" section of the scene browser.

I'll get this fixed up for the next beta so that those edges will not inherit the name of the generating curve, that's kind of a bad side effect from a mechanism that tries to maintain object properties whenever an object is copied - in this case some edge curves in the resulting solid come from direct copies of the original input curve.

- Michael

Michael,

Thanks for the explanations, tips and help.

Cheers,

Leonard