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The "Hollow" BSP ability breaks my geometry

Trying to develop a series of rings, I create cylinders with the "Hollow" geometry setting checked. The below images are the results: alt text

More importantly, any other BSP that intersects these rings get corrupted with faces missing and even after deleting the rings, the BSP remains corrupted. After turning "Hollow" off and rebuilding geometry, my engine crashed.

Product Version: Not Selected
ringbug.jpg (752.3 kB)
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asked Oct 16 '14 at 04:20 PM in Using UE4

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avatar image Liforce Oct 16 '14 at 04:23 PM

Another strange bug: After restarting the editor, Unreal asked if I wanted to restore the unsaved level. I hit "Yes" but got an error message that Unreal couldn't load it. What it did load, was the level minus all the bugs.

avatar image Jonathan Dorman STAFF Oct 17 '14 at 09:56 PM

I'm not seeing this behavior when creating Hollow geometry in 4.4.3 or 4.5. To be clear, these are the steps I'm taking:

  1. Drop two additive cylinders from the BSP menu into the level.

  2. Select both cylinders.

  3. Click the 'hollow' checkbox in the Details panel.

Are you doing something different?

avatar image Liforce Oct 17 '14 at 11:53 PM

It's not the hollowing, but unhollowing that causes issues.

  1. Add two additive cylinders from BSP menu into the level

  2. Select both cylinders

  3. Click hollow

  4. Build Geometry

  5. Click unhollow

  6. Build Geometry

avatar image Jonathan Dorman STAFF Oct 21 '14 at 06:16 PM

I'm still having no luck reproducing this issue (tried in 4.4.3, 4.5) by following your steps precisely.

What version of the editor are you using?

avatar image Liforce Oct 21 '14 at 07:21 PM

Version 4.4.3

avatar image Jonathan Dorman STAFF Oct 21 '14 at 08:01 PM

Do you have any other ideas about what might be causing the problem? I've tried following your steps in 4.4.3, with Update BSP Automatically on, and then with it off, and neither caused anything out of the ordinary.

avatar image Liforce Oct 21 '14 at 08:05 PM

I've been following the same steps to repeat my issue. Maybe there is a hardware difference where my computer can't process the geometry?

avatar image Jonathan Dorman STAFF Oct 21 '14 at 08:17 PM

That's possible. Do you find this same thing happens in a new project?

If you wouldn't mind, send me your dxdiag, as well.

avatar image Liforce Oct 21 '14 at 08:27 PM

I can't get the issue to duplicate consistently in new projects. How do I upload the Unreal dxdiag?

avatar image Jonathan Dorman STAFF Oct 21 '14 at 08:50 PM

The dxdiag is a windows utility, not something related to Unreal. On Windows 7, you can just type 'dxdiag' in the Start menu and run it, then Save All Information.

avatar image Jonathan Dorman STAFF Nov 04 '14 at 06:57 PM

Are you still having trouble with this, Liforce?

avatar image Liforce Nov 04 '14 at 07:03 PM

I can no longer duplicate the issue.

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Since the issue is not reappearing, I'm marking this question as Resolved. Let me know if the issue reappears and we'll investigate it further.



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answered Nov 04 '14 at 07:11 PM

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