Profiler shows massive spikes in active constraints

here is a screenshot of the profiler


most frames are steady at around 5k active constraints but this spikes to almost a million at it's worst.

Where might i find the cause of this spike?

 

Constrains of what?

 

thats my question, how do i find the cause of all these constraints

 

Disable some objects, observe profiler and try find which one(s) is/are cause.

 

I am seeing the same thing, but I am getting up to 105k constraints. I will attempt to isolate it, but it would be helpful if there were a way to discover what kind of constraints we are talking about.
We have a voxel based game and there are about 60k voxels in the scene that I am testing with (damn UGC).
However, 95% of them are static and without rigid bodies.
We have less than 20 contacts most of the time.
Oddly it is 0 for a period and jumps up to 105k for a few frames, then falls back to 0 and the cycle repeats.

 

I'm having the same issue and a lot of difficulty isolating, so far no luck.

 

hi, I am looking at similar behaviour in the profiler however I know what is causing it in my case (suggestions on how to fix welcome). Essentially I am instantiating a destructing object (a rock) which is composed of ~20 subobjects partially into a terrain. They explode nicely but the physics simulation eats GPU before stabilising. Moving the object slightly so it does not intersects the terrain fixes the problem. I will probably try carving a "crater" in the terrain as I need to do that anyway..

 

FYI in case anyone is interested carving out a section of the terrain to reduce the overlap fixed the problem for me, and I needed a crater anyway

 

Did anyone solve this, I too am having this issue in Unity 2019.3.5f1

 

Anyone got a bug case number or code?

 

I'm seeing this odd behaviour too. Would be nice to understand whats going on here?

Number is normally low, but keeps spiking to nearly 100k active constraints? Its just 10-20 rigidbodies in a static scene! There can't possibly be that many interactions going on?!

 

Did anyone fix this as I'm still getting around 40k - 100k active constraints. I think it has something to do with Joints and Kinematic Objects being moved

 

I am seeing this also,
200-300 constraints yeah maybe, but 300k constraints smells like a bug

 

8.7m constraints...
No joints, just rigidbodies with no constraints

 

Yeah having the same issue here. I have characters with Rigidbodies, but I have the bone hierarchy root object set to inactive. Spikes frequently to 65.5k constraints from 0 with one character. Millions of constraints when many characters are spawned.

 

Any bug report numbers?

 

I did find this:

https://issuetracker.unity3d.com/is...-inside-profiler-when-rigidbodies-are-rolling