Hi i have some bug with contraint and sleep mode
havok really need option for disable sleep on rigidbody
i see you will improve contraint option in future, i can help for that
constraint need a quartenion for orientation instead of perpendicular axis
constrain need drive and spring control
Hey! sorry but this is a Babylonjs forum. We do not prevent people from using Havok with other engines but we do not support these implementations of course 
If you can repro with the Babylon.js official codebase we will gladly fix the issue
hum ok …
is only about physics but anyway 
I think thats a little unfair, considering hes the author of the physics lib babylon has been using as its default for 10 years. Also, his experiments and examples certainly benefit us all.
I understand your point but this is a babylonjs forum:)
We cannot start to go off-road even for Havok. I will gladly connect @3th with Havok team if he is interested though
And my ask is only to reproduce the error through babylonjs code which is the easiest way for the team to help fix and improve.
So help us helping you.