EndFrameTRSToLocalToWorldSystem too Slow

[Opeth001]

Hello Everyone,

After upgrading my project from Unity 2016.4.x to 2020.1.x the fps dropped and this is related to EndFrameTRSToLocalToWorldSystem.
this system is supposed to update the LocalToWorld cd from Translation, Rotation and Scale. for some reason this applies to all existing entities, even static ones, which doesn’t make sense to me.

can someone explain it please?

[YurySedyakin]

Hey, I have a guess on what’s going on. There is a changed check at the beginning of TRSToLocalToWorldSystem.Execute. In particular, it checks chunk.DidOrderChange. My guess is that’s the cause. See my (quite old) post:

Need read only access to dynamic buffers

This one is still there, unfortunately. Just so you realize, this restricts people from traversing parent-child hierarchy of entities, because once you READ the children buffer it marks it as changed, which means rebuilding local-to-world matrices, because the transformation systems consider your hierarchy as changed, which is wrong. This is true for other (my own) systems that should take hierarchy changes into account.

And the corresponding issue tracker:

Unity IssueTracker - Entity is shown as changed when JobComponentSystem...

Good news is that the issue is marked as “Fix In Review for 0.15” Yohoo!!!

[Opeth001]

@YurySedyakin

Hey, I have a guess on what’s going on. There is a changed check at the beginning of TRSToLocalToWorldSystem.Execute. In particular, it checks chunk.DidOrderChange. My guess is that’s the cause. See my (quite old) post:
https://discussions.unity.com/t/780124/5
And the corresponding issue tracker:
https://issuetracker.unity3d.com/issues/entity-is-shown-as-changed-when-jobcomponentsystem-enters-an-onupdate-function-with-withreadonly-bufferfromentity-expression
Good news is that the issue is marked as “Fix In Review for 0.15” Yohoo!!!

thanks !!!