I've already submitted a bug report through the proper channels, but I figured I'd try to get some help here as well.

If I group select, it always behaves as if the "A" key (loop selection) is stuck on, and can't do ANYTHING except loop select. No box select, lasso, nothing works except selecting through a loop. It can be seen in the second half of this video. This was never an issue until just recently, so maybe it has something to do with 20.5?



I would be absolutely thrilled if this were just a mistake on my part, that I toggled some bizarre setting and that the fix for this is simple.

Has anyone else encountered this issue?

Usually there are no such errors. Although several times strange errors with selection or disappearance of groups appeared and only rebooting Houdini helped.
And yes, with any strange behavior, start with resetting the viewport. Quite a few bugs are hidden there.

RGaal
Usually there are no such errors. Although several times strange errors with selection or disappearance of groups appeared and only rebooting Houdini helped.
And yes, with any strange behavior, start with resetting the viewport. Quite a few bugs are hidden there.

I had tried resetting the Viewport several times, and resetting Houdini itself several times, to no avail. HOWEVER, after resetting the whole computer, everything seems to be working fine (for now....). It could be that because I sometimes leave the computer on for several days at a time, some sort of rot happened at the system level which caused this bug (it really shouldn't be like this, but that's just how computers are).

I kinda also get the vague impression that opening multiple Scene Views (3D viewports) might on some level "accelerate" this rot that leads to instability in Houdini. But I'm not sure.

I will periodically update this thread when I have new findings.

hi there, have you find a solution to this? I have been getting the same bug. extremely frustrating. I have tried restarting houdini, create a new scene but nothing. Might try restarting my pc as well however, it would be really annoying if that is the only way to fix this. I love houdini but I will say, with subsequent updates i have been noticing more bugs and glitches. I hope we avoid a second maya and not only focus on growth but also resolving current issues that often plague houdini, the viewport definitely being one of them.

genesis77
hi there, have you find a solution to this? I have been getting the same bug. extremely frustrating. I have tried restarting houdini, create a new scene but nothing. Might try restarting my pc as well however, it would be really annoying if that is the only way to fix this. I love houdini but I will say, with subsequent updates i have been noticing more bugs and glitches. I hope we avoid a second maya and not only focus on growth but also resolving current issues that often plague houdini, the viewport definitely being one of them.

It still happens to me from time to time, but not enough that it really bothers me anymore. I'm still not sure what causes it, but I'll speculate it might have something to do with a connected drawing tablet monitor. Do you have one of those (like a Huion or something)?

I've noticed that after I switched to another drawing tablet (one of the new XP-Pens) thus changing the drivers and stuff, I haven't noticed the problem since, but it's a little too early to tell I think.

An update for anyone who's interested in this bug. As of 20.5.410, it still happens, and it doesn't seem to have anything to do with drawing tablet, so we can rule that out. Another theory I've come up with is that it could be related to splitting the viewer scene tab into another (for example, geometry spreadsheet tab). I've noticed that the viewport tumbling bug seems to come on sooner when I take the geometry spreadsheet tab (the default one alongside the main viewport scene tab) and split or tear it off.

I don't understand why that would trigger it as opposed to the other tabs already open such as the network view or parameters tab, but that's what I've observed.

Will continue to update periodically.

Another update: I've noticed another characteristic of the viewport tumbling bug. It gets triggered when you press any button after holding spacebar. At first I thought it was limited to F or H or the number keys (frame selected, Home, orthographic shortcuts, etc...) but it turns out it gets triggered by anything. To that end, I've noticed that this bug can be fixed (temporarily) if, after holding spacebar, you press one of the transform keys (T, R, E, etc..) this SEEMS to actually release whatever stuck state that causes the viewport tumbling, but it will come back soon. I've submitted this info to SideFX bug report, and I feel like we're much closer to understanding what this bug is now that we have a better idea of what specifically triggers it.

Still haven't figured out the group selection bug, that one doesn't happen to me that often so it's hard to say what it really is.

genesis77
hi there, have you find a solution to this? I have been getting the same bug. extremely frustrating. I have tried restarting houdini, create a new scene but nothing. Might try restarting my pc as well however, it would be really annoying if that is the only way to fix this. I love houdini but I will say, with subsequent updates i have been noticing more bugs and glitches. I hope we avoid a second maya and not only focus on growth but also resolving current issues that often plague houdini, the viewport definitely being one of them.

Did you get anywhere with this? I have a similar issue. No rhyme or reason to it: randomly any given selection might insist on being loop mode. No key combo cancels or changes it. Only opening a new Houdini.
I also use a tablet. A Wacom.

tomwcutler
Did you get anywhere with this? I have a similar issue. No rhyme or reason to it: randomly any given selection might insist on being loop mode. No key combo cancels or changes it. Only opening a new Houdini.
I also use a tablet. A Wacom.

No. It hasn't happened to me in a while, but I suspect it'll creep up again any day now. I don't think it has anything to do with the tablet, because I've changed/reinstalled/uninstalled different tablets.

Neither of these problems have been solved for me unfortunately. I am actively talking to SideFX about it, but I haven't figured anything out yet. Will continue to update.

Has anyone found a solution for this?

It's super annoying. Once it happens the only solution seems to be restart Houdini. Even resetting the viewport doesn't help.

It happens when I'm not using a tablet, so I don't think tablet is relevant here.

(Houdini is probably the only DCC on the market that can't do basic things like selecting a point reliably. Truly a one of its own kind software.)

Anyone has insight on this?

This issue is single-handed preventing me from using Houdini as the main modeling tool. It happens frequently enough to slow me down significantly, while not frequently enough for me to pinpoint steps to reproduce it... it's driving me crazy.

Same issue here

Same issue here

This is still happening in h 21.

I've recently restarted using the program, so I'm gonna try and get to the bottom of this. Starting from scratch, one major difference seems to be the program-wide DPI settings. Leaving it at the default seems to have put things to normal, but we'll see.

Also, keeping your Windows PC on for a long time, I've found, makes Houdini much more prone to these issues. So restarting your PC frequently, just subjectively, seems to help for a time.

Any info you guys can share about your situation ought to help. We can compare similarities to try and narrow it down. Thanks!

Excited to share a workaround for the group selection stuck looping issue. When it is happening, if you change the selection mode to something other than current one (so if you're currently selecting primitives, change selection mode to edges or points, etc...). In doing so, the selection seems to "reset", and when you switch back, it's back to a normal click until you make another selection.

Now, note this doesn't actually fix the issue. You still can't box select, or use anything else. And you have to do this reset for every single click you do. It's a terrible hack. But for very simple selections you can at least DO something with it now.

Ultimately the best thing I've found is just... restart your Houdini and your PC often, and pray it doesn't come back. It only seems to come back after like one or two hours of using Houdini from reopen. Still not ideal, but at least you can still use the program.

As an update, program-wide DPI settings doesn't make a difference. The issue still happens.

I'm gonna reopen the support ticket on this issue and see if I can get SideFX to get to the bottom of this.

I encountered this bug last night, it was after working in the uvflatten state for a while doing lots of loop selections with
shift + A + middle click. Uvflatten was working totally fine, but afterwards when trying to do another edge selection from a group sop I noticed Houdini was stuck in loop select mode. Had to relaunch Houdini to get it back to normal.