Hi Pilou, I have finished the fix for the earlier one now, so that surfaces of revolution are handled properly and it will not attempt to flip an object that has a surface of revolution inside of a larger assembly. This corrects the normal direction of that open surface that you attached earlier, this will be in the next beta.


> Curious bug ! (?)
> Bug 1 Revolve has given these artefact under
> but when you copy past the section and make again a revolve all works!

This type of artifact near the pole area usually means some kind of alignment problem with the axis, where the endpoints of the revolved surface are slightly separated or overlapping each other instead of merged into one common single point.

The problem here is the profile curve is just very slightly above the origin in z, if you zoom in tightly to the front view you will see this gap:



That is only a small distance (0.0008 units) above, but still above it... It's large enough to cause the alignment problem.

What happened here is the revolve with the artifact in it was created by snapping the revolve axis to the origin or the grid, which is slightly off from the endpoints. When Steph tried it the second time after copy/paste, he probably snapped the revolve axis using endpoint object snap which then would produce the cleaner result.

I should probably do something like automatically move the endpoints of the profile curve to be directly on the axis if they are within a very small distance like this. That would fix this problem up automatically.


> Bug 2 Impossible to make a boolean diff !
> but when you load it all works!

Hmmm, thanks for sending this. That one is going to be hard to figure out since the problem doesn't repeat anymore. Maybe I will be able to compare it to other reports later on and see some kind of pattern.


> Not a bug
> Fillets block on construction line!

Yes, this is a limitation of the current fillet engine. Fillets won't cross an edge boundary like this. I hope that this will be improved in future versions of the geometry library that I am using.


> An automatic function closing curves / Surfaces ? (like "planar" but for any curves :)

This is the type of thing that an "N-sided patch" typ[e tool can possibly be used for. But unfortunately that one is not currently working well enough, it's another one that I hope will improve to work well in a future version.


Can you ask Steph if he has run into any program crashes while using MoI recently?

Thanks!

- Michael

Thx for the explanations!

< any program crashes while using MoI recently?
No and he has 12 --15 progs running in the same time :)

new bug during the export Obj (3dm linked)! (enable shaded for see it)

Hi Michael,
I can confirm that this does appear to be an intermittent bug -
Here's what I've noticed:
- MoI will refuse to do a boolean op, doesn't seem to matter which op is being attempted.
- It only happens after I've been using MoI for 2-3 hours straight.
- The forms being operated on don't seem to matter. Extruded forms, swept forms, primitive solids, all the same problem.
- I've had this bug pop up maybe 3 or 4 times over the last few months, so it's a fairly rare bug, and doesn't seem to have any consistent pattern of when and why it happens.
The solution that i've worked out is to save the file, close MoI, restart MoI, load the file, and then the boolean op I'm attempting will work fine.
Hope this helps!

Paul

Hi Paul, that does help. I didn't quite understand that it was a problem with all attempted booleans after a certain point.

This sounds like some kind of memory corruption problem due to some bug in the booleans. For the next beta I've added a type of "reset" when there is a failure in a command which should let the next command start with a fresh blank slate.

This will probably not stop the initial failure, but I think it should solve the problem of additional booleans not working.

But I can't really be sure though since I can't reproduce the bug. Please let me know if you run into this type of behavior again after the next beta and I will try something else...

Thanks,

- Michael

Hi Michael
What about this previous bug?
http://moi3d.com/forum/index.php?webtag=MOI&msg=582.19

> Hi Michael
> What about this previous bug?

It definitely looks like a meshing bug, I'm going to look at it some more tomorrow.

- Michael

Hi Pilou, I looked at it some more but haven't got a fix for it yet, I'll be trying some more again tomorrow.

- Michael

Take your time :)

Hi Pilou, I was able to fix this mesh export bug for the next beta. Thanks for sending it in!

Also I have finished tuning up revolve, so that if you have a planar shape that is just very slightly away from the revolve axis, it will move it exactly in line with the axis to avoid problems at the pole area like in that other revolve problem earlier.

- Michael

Cool!
Seems bugs generation is like a bottomless pit :)