copy transform to game object proxy (with rotation + scale) skewed

hello,

I wonder if anyone else has encountered this and could offer assistance. It's for the case of a DOTS physics shape where it's desirable to have a representative gameobject follow the physics shape (Convert And Inject Game Object). With transform scale all set to 1.0 or rotations all set to 0 it works fine. However if I set both the scale and rotation to another value then the rotation of representative gameobject will be skewed when I hit play.

Inspector with 0.1 scale & no rotation, gameobject is aligned with entity:





Inspector with 0.1 scale & 90 rotation, gameobject is skewed:



If I pause and look at the transform of the gameobject, it’s skewed by -32.18 degrees.



Thanks,
Nate B.

 

Hi @impulse_ctrl, are you maybe touching rotation in the "copy transform to game object proxy" or "game object entity" scripts?
I tried adding a cube to HelloWorld scene in UnityPhysicsSamples and playing with scale/rotation, didn't notice anything unusual.

 

GameObjectEntity

and the associated scripts where depreciated a while back so I don't recommend using them. I found some discussion on the topic on this thread.
Furthermore, Unity Physics bakes in scale at conversation time, removing dynamic bodies from any hierarchy and only updates the new root entities

Translation

and

Rotation

component data structs.

CopyTransformToGameObjectProxy

is definitely not going to work as you are expecting if the GameObject is still in a hierarchy and when scale, and more importantly skew, is involved in the transform matrix.

If you need the functionality of an GameObject following an Entity it would be best to implement your own System. The Unity Physics Samples have a basic EntityTracker example system that does this. Drop on the EntityTracker script to your GameObject and use the 'Convert and Inject Game Object' Conversion Mode in 'Convert To Entity'.