Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale

Development Programming & Scripting
1

Had a couple of errors go off while running our integration tests. Thought perhaps these numbers may be useful to somebody. Haven’t seen the visual results of this, but the build doesn’t crash, it just causes our integration test to fail.

Wondering if it’s possible we’ve done something wrong, or just that this edge case is not being handled well?

Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
Error: SystemPositionForMacroUVs: {87478.187500, -81287.257813, 1705.693115}
Error: ObjectPostProjectionPositionWithW: {-293.613281, -84.152344, 10.000000, 0.007813}
Error: RightPostProjectionPosition: {-148.808594, -84.150391, 10.000000, 0.000000}
Error: UpPostProjectionPosition: {-293.609375, 173.273438, 10.000000, -0.007813}
Error: ObjectNDCPosition: {-37582.500000, -10771.500000}
Error: RightNDCPosX: -1.#INF00
Error: UpNDCPosY: -22179.000000
Error: MacroUVPosition: {87478.187500, -81287.257813, 1705.693115}
Error: MacroUVRadius: 200.000000
Error: DX: -1.#INF00
Error: DY: -11407.500000
Error: View0: {-0.948824, -0.315441, -0.015159, 1.000000}
Error: View1: {-0.068930, 0.160015, 0.984705, 1.000000}
Error: View2: {-0.308191, 0.935357, -0.173569, 1.000000}
Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
Error: ViewProj0: {-0.686864, -0.228676, -0.010921, 1.000000}
Error: ViewProj1: {-0.088836, 0.206307, 1.267383, 1.000000}
Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
Error: ViewProj3: {-0.308191, 0.935357, -0.173569, 1.000000

Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
Error: SystemPositionForMacroUVs: {87615.867188, -81687.945313, 1703.777710}
Error: ObjectPostProjectionPositionWithW: {-303.000000, -86.011719, 10.000000, 0.000000}
Error: RightPostProjectionPosition: {-157.308594, -86.013672, 10.000000, 0.000000}
Error: UpPostProjectionPosition: {-303.003906, 172.994141, 10.000000, 0.007813}
Error: ObjectNDCPosition: {-30300000.000000, -8601172.000000}
Error: RightNDCPosX: -1.#INF00
Error: UpNDCPosY: 22143.250000
Error: MacroUVPosition: {87615.867188, -81687.945313, 1703.777710}
Error: MacroUVRadius: 200.000000
Error: DX: -1.#INF00
Error: DY: 2097152.000000
Error: View0: {-0.951876, -0.306114, -0.015062, 1.000000}
Error: View1: {-0.067936, 0.162816, 0.984315, 1.000000}
Error: View2: {-0.298860, 0.937969, -0.175776, 1.000000}
Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
Error: ViewProj0: {-0.693260, -0.223431, -0.010890, 1.000000}
Error: ViewProj1: {-0.087942, 0.210736, 1.274744, 1.000000}
Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
Error: ViewProj3: {-0.298860, 0.937969, -0.175776, 1.000000}

2

Hello KeirBlackDelta,

What kind of integration testing are you running? It would be helpful to have more context on the situation to tell what is going on.

3

We haven’t heard from you in a while, KeirBlackDelta. Are you still experiencing these issues? If so, could you provide the information I requested? We need more information from you to progress with this issue.

In the meantime I’ll be marking this post as resolved for tracking purposes. Whenever you’re available, please leave a comment and the post will reopen.

4

Hi - I haven’t investigated the exact cause or context as yet but it happens to us a couple of times a week during our integration tests which basically consists of AI-driven cars driving many laps around racing tracks.

As it looks to be a rare bug I thought I’d mention it as it looks as though Epic would like a repeatable test case and we have it occurring here fairly often.

It’s not holding us back at the moment as we are able to comment out the error messages.

5

I understand and I appreciate the report, but without any sort of reproduction steps, this wouldn’t be helpful for solving the problem. We would need some sort of way to reproduce the issue ourselves so that we can take a look at the issue and attempt to fix it.

6

I had this error happen before but I was unable to determine what was causing it as I don’t have any particle material using Macro UV’s and it seemingly happened at random (but only when my pawn moved). If I had to guess it was in a PS with a Sphere spawn and a Killbox around it, that I had parented to my pawn’s SpringArm to give the effect of space movement. I’m not sure what I did to make the error stop

Here is one of the outputs:
LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
LogParticles:Error: SystemPositionForMacroUVs: {-2761.790039, -1107.707153, 2685.805664}
LogParticles:Error: ObjectPostProjectionPositionWithW: {0.000000, -228.866699, 10.000000, 0.000122}
LogParticles:Error: RightPostProjectionPosition: {238.350830, -228.866943, 10.000000, 0.000000}
LogParticles:Error: UpPostProjectionPosition: {0.000000, 228.866699, 10.000000, -0.000122}
LogParticles:Error: ObjectNDCPosition: {0.000000, -1874876.000000}
LogParticles:Error: RightNDCPosX: inf
LogParticles:Error: UpNDCPosY: -1874876.000000
LogParticles:Error: MacroUVPosition: {-2761.790039, -1107.707153, 2685.805664}
LogParticles:Error: MacroUVRadius: 200.000000
LogParticles:Error: DX: 2097152.000000
LogParticles:Error: DY: 0.000000
LogParticles:Error: View0: {0.404583, 0.726425, 0.555535, 1.000000}
LogParticles:Error: View1: {-0.352568, -0.436612, 0.827687, 1.000000}
LogParticles:Error: View2: {0.843806, -0.530732, 0.079469, 1.000000}
LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles:Error: ViewProj0: {0.482164, 0.865720, 0.662060, 1.000000}
LogParticles:Error: ViewProj1: {-0.806911, -0.999259, 1.894301, 1.000000}
LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles:Error: ViewProj3: {0.843806, -0.530732, 0.079469, 1.000000}

7

I am getting the same thing in 4.15:

[tid=DE803B77][t=359.295197]LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
[tid=DE803B77][t=359.295197]LogParticles:Error: SystemPositionForMacroUVs: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectPostProjectionPositionWithW: {-607.687500, -5164.468750, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightPostProjectionPosition: {-439.859375, -5164.472656, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: UpPostProjectionPosition: {-607.656250, -4866.117188, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectNDCPosition: {-60768752.000000, -516446880.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightNDCPosX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: UpNDCPosY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVPosition: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVRadius: 200.000000
[tid=DE803B77][t=359.295197]LogParticles:Error: DX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: DY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: View0: {-0.964013, 0.157439, 0.214224, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View1: {0.234094, 0.120752, 0.964686, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View2: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj0: {-0.808903, 0.132107, 0.179755, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj1: {0.349206, 0.180130, 1.439054, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj3: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
[tid=DE803B77][t=359.295197]LogParticles:Error: SystemPositionForMacroUVs: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectPostProjectionPositionWithW: {-607.687500, -5164.468750, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightPostProjectionPosition: {-439.859375, -5164.472656, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: UpPostProjectionPosition: {-607.656250, -4866.117188, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectNDCPosition: {-60768752.000000, -516446880.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightNDCPosX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: UpNDCPosY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVPosition: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVRadius: 200.000000
[tid=DE803B77][t=359.295197]LogParticles:Error: DX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: DY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: View0: {-0.964013, 0.157439, 0.214224, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View1: {0.234094, 0.120752, 0.964686, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View2: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj0: {-0.808903, 0.132107, 0.179755, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj1: {0.349206, 0.180130, 1.439054, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj3: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
[tid=DE803B77][t=359.295197]LogParticles:Error: SystemPositionForMacroUVs: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectPostProjectionPositionWithW: {-607.687500, -5164.468750, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightPostProjectionPosition: {-439.859375, -5164.472656, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: UpPostProjectionPosition: {-607.656250, -4866.117188, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectNDCPosition: {-60768752.000000, -516446880.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightNDCPosX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: UpNDCPosY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVPosition: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVRadius: 200.000000
[tid=DE803B77][t=359.295197]LogParticles:Error: DX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: DY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: View0: {-0.964013, 0.157439, 0.214224, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View1: {0.234094, 0.120752, 0.964686, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View2: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj0: {-0.808903, 0.132107, 0.179755, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj1: {0.349206, 0.180130, 1.439054, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj3: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
[tid=DE803B77][t=359.295197]LogParticles:Error: SystemPositionForMacroUVs: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectPostProjectionPositionWithW: {-607.687500, -5164.468750, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightPostProjectionPosition: {-439.859375, -5164.472656, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: UpPostProjectionPosition: {-607.656250, -4866.117188, 10.000000, 0.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ObjectNDCPosition: {-60768752.000000, -516446880.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: RightNDCPosX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: UpNDCPosY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVPosition: {207325.828125, -422379.500000, -44242.515625}
[tid=DE803B77][t=359.295197]LogParticles:Error: MacroUVRadius: 200.000000
[tid=DE803B77][t=359.295197]LogParticles:Error: DX: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: DY: -inf
[tid=DE803B77][t=359.295197]LogParticles:Error: View0: {-0.964013, 0.157439, 0.214224, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View1: {0.234094, 0.120752, 0.964686, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View2: {0.126011, 0.980118, -0.153262, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj0: {-0.808903, 0.132107, 0.179755, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj1: {0.349206, 0.180130, 1.439054, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
[tid=DE803B77][t=359.295197]LogParticles:Error: ViewProj3: {0.126011, 0.980118, -0.153262, 1.000000}

8

Hello Phil,

As I mentioned in my other posts to the original poster, without steps or information on how to reproduce this issue, I will not be able to continue investigating this issue. I would also suggest trying to make a copy of your project and upgrade it to a newer version of the engine to see if the issue is resolved.

9

Dear ,

.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Particles/ParticleSystemRender.cpp#L7008

This is a hard to reproduce issue - by Epic standards as well - and the error is printed to provide you / us with more informations regarding why the values of DX and DY may become invalid after the computations. In all three reports you can clearly see the Right /o Up PPPos w will be 0, which results in an invalid matrix operation, and this is as long as i can understand what is triggering the error. Beyond that, an engineer involved in the implementation of this math should take a look at the values. Please forward these error reports to the assigned person who will investigate it further.

The error message is implemented for this very reason, and is enabled by default which is triggering malfunctions in the tests the OP was conduncting, which means it should be disabled by default. As for this, i’d suggest an another issue tracker record can be put in, so the value will be disabled for next versions.

It’s been there since 4.10 and most likely spamming the logs for everybody with these scary messages provides no informations for us regular beings what is causing it actually.

10

@KeirBlackDelta , by executing the r.EnableDebugSpam_GetObjectPositionAndScale 0 command you should be able to turn this thing off, and won’t cause further issues in your tests.

11

I’m using 4.16.3 and having the same problem, but it is hard to reproduce the bug…please help

LogParticles:Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
LogParticles:Error: SystemPositionForMacroUVs: {-288488.062500, 94269.554688, -822.198792}
LogParticles:Error: ObjectPostProjectionPositionWithW: {-327.019531, -413.882813, 10.000000, -0.031250}
LogParticles:Error: RightPostProjectionPosition: {-143.750000, -413.882813, 10.000000, 0.000000}
LogParticles:Error: UpPostProjectionPosition: {-327.023438, -42.882813, 10.000000, 0.000000}
LogParticles:Error: ObjectNDCPosition: {-32701954.000000, -41388280.000000}
LogParticles:Error: RightNDCPosX: -inf
LogParticles:Error: UpNDCPosY: -inf
LogParticles:Error: MacroUVPosition: {-288488.062500, 94269.554688, -822.198792}
LogParticles:Error: MacroUVRadius: 200.000000
LogParticles:Error: DX: -inf
LogParticles:Error: DY: -inf
LogParticles:Error: View0: {-0.149925, -0.988697, 0.000000, 1.000000}
LogParticles:Error: View1: {-0.169382, 0.025685, 0.985216, 1.000000}
LogParticles:Error: View2: {-0.974080, 0.147709, -0.171318, 1.000000}
LogParticles:Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles:Error: ViewProj0: {-0.137381, -0.905974, 0.000000, 1.000000}
LogParticles:Error: ViewProj1: {-0.314205, 0.047646, 1.827587, 1.000000}
LogParticles:Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles:Error: ViewProj3: {-0.974080, 0.147709, -0.171318, 1.000000}

12

Just started happening to me in the editor in 4.21, never seen it before and I have no idea what it’s referring to as I haven’t really added any new particles. Maybe not a problem as there is no crash. But I’ll report back if it causes any more significant issues.

LogParticles: Error: Bad values in FParticleSystemSceneProxy::GetObjectPositionAndScale
LogParticles: Error: SystemPositionForMacroUVs: {105663.742188, 112705.078125, -19.388561}
LogParticles: Error: ObjectPostProjectionPositionWithW: {-124.714844, -527.625000, 10.000000, 0.000000}
LogParticles: Error: RightPostProjectionPosition: {75.281250, -527.625000, 10.000000, 0.000000}
LogParticles: Error: UpPostProjectionPosition: {-124.710938, -209.828125, 10.000000, 0.000000}
LogParticles: Error: ObjectNDCPosition: {-12471484.000000, -52762500.000000}
LogParticles: Error: RightNDCPosX: inf
LogParticles: Error: UpNDCPosY: -inf
LogParticles: Error: MacroUVPosition: {105663.742188, 112705.078125, -19.388561}
LogParticles: Error: MacroUVRadius: 200.000000
LogParticles: Error: DX: 2097152.000000
LogParticles: Error: DY: -inf
LogParticles: Error: View0: {0.867817, -0.496883, -0.000000, 1.000000}
LogParticles: Error: View1: {-0.148571, -0.259484, 0.954251, 1.000000}
LogParticles: Error: View2: {-0.474151, -0.828115, -0.299007, 1.000000}
LogParticles: Error: View3: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles: Error: ViewProj0: {0.867817, -0.496883, -0.000000, 1.000000}
LogParticles: Error: ViewProj1: {-0.236076, -0.412313, 1.516281, 1.000000}
LogParticles: Error: ViewProj2: {0.000000, 0.000000, 0.000000, 1.000000}
LogParticles: Error: ViewProj3: {-0.474151, -0.828115, -0.299007, 1.000000}

…etc

13

This is not a bug. There is a particle outside the level boundaries " {-288488.062500, 94269.554688, -822.198792}". You need to get it inside the level grid.

14

Disinformation, but why?

Reasoning in the follows:
.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Particles/ParticleSystemRender.cpp#L7103

The console command’s help will explain the functionality.
“Enables or disables debug log spam for a bug in” It is a bug, epic did recognize the issue.

.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/Engine/Private/Particles/ParticleSystemRender.cpp#L7153

The validation is put there to investigate the bug. It is enabled by default, which is causing the error showing up. Appears to be safe to ignore, and once you set the console command it won’t spam your logs anymore. It should actually be disabled by default, but it’s not.

15

327803-dingtalk-20210122105324.jpg
327803-dingtalk-20210122105324.jpg965×314 30.8 KB

use fixed Relative bounding box!

16

I had the same error and I have fixed it by adding a delay before spawning the particle.