DMX Fixture POP/DMX Out crashing when rapidly changing values going into lookupTexture POP

POPs
1

When rapidly changing data, jumping to new values, or creating fast changing values (for chases or strobes etc) that go into the lookupTexture POP, the DMX output freezes.

When the output is frozen and I hit the ‘active’ button on the DMX Fixture Pop, TouchDesigner entirely freezes and crashes. I was able to recreate this freezing/crashing behaviour several times in both TD2025.30960 and 2025.31310

TouchDesigner DMX Fixture POP crash example.1.toe (6.2 KB)

I used a lookupTexturePOP to alter the color and tilt. I got crashes doing the following things:

  • Jamming the fader in ‘constant1’ to create a fast chase
  • Changing the position of the colors in ‘ramp1’
  • Changing the resolution of the TOPs

In general when rapidly changing values the output freezes.

Thanks for the hard work.

Cheers,

Daniël

2

Hello @daniel_steenhoff

I haven’t been able to reproduce the crash on either Windows or macOS so far. Could you confirm if you’re running Windows? Also, are you seeing a dump file generated when the crash occurs? You can follow the steps outlined here to locate and retrieve those files.

3

Hey! Apologies for not replying earlier to this. I’ve tested it just now and got it to crash again on version 2025.32050. This is on a high-end Windows 11 PC. I’ve also tested it on my mid-range Windows 11 Laptop and couldn’t get it to crash there. I am not seeing any dump files generated.

Here is a recorded demonstration of the crash.

Crash Example.zip (2.6 MB)

4

Thanks for the video. Would it be possible for you to share this patch so that we could try to replicate the crash?

Thanks

1 Like
5

It’s the same patch as the one in the first post in this thread! I downloaded that exact file today and was able to create the crash

1 Like
6

Similar to Guillaume I also can’t reproduce. When it’s hung, can you generate a dmp file from Task Manager (Details page > RMB TouchDesigner > Create Memory Dump File) and send it over?

7

Absolutely,

Here it is: Dump file Fixture POP Crash - Google Drive

This was done in 2025.32050

8

Thanks. I think I know what the issue is. I’ll get back to you once I have a fix.

9

That’s great, thank you for looking into it :slight_smile:

10

I’ve implemented a fix that will be in the next official build we release: 2025.32307+. I still haven’t been able to reproduce, so if you’d like to test an intermediate build to verify it’s fixed on your end then send me a message and I’ll provide one.

1 Like
11

Hello, I’ve encountered the same issue, but in my case DMX simply stops working and nothing helps until I reload the show file. After some time, the same problem happens again.

Could you please let me know when we can expect a fix for this issue? :folded_hands:t2:

12

What build are you using? Does it crash/hang or are packets simply no longer being sent? What does the DMX Out POP’s Info DAT packet_rate report? I’m not certain if your issue is the same as the one outlined in this post, but if you wish to test an intermediate build with some fixes then send me a direct message and I can provide one.

13

I’m using build 2025.32280.

There are no crashes or hangs — the packets simply stop being sent.

I’m outputting 2592 universes (it’s a volumetric screen).

I’ll be able to give you more details in about 12 hours.

I would really like to test the intermediate build — I’ll message you. Thank you very much!