Why Physics Object Doesn't go to Sleep when immovable?

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- Shubi
- - Joined 9 Dec, 2016
  - 99 topics • 481 posts
- 1
- 26 Aug, 2019
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Hi everyone...

Here is a test file...

https://drive.google.com/file/d/1DcLLEHO331Gtz4JIB6qUK3Kwa2pCsqR4/view?usp=sharing

How come a physics object go to sleep when naturally comes to rest but not if is set to immmovable?

In example file you can see the base object and block sitting on it goes to sleep but not the same block suspended in air.(Use Debug)
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- Colludium
- - Joined 26 Aug, 2013
  - 151 topics • 2,659 posts
- 1
- 26 Aug, 2019
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It's how Box2D code is written.

In Box2D, when a body is created it's m_flags variable is set so that the e_awakeFlag bit is 1 (ie IsAwake returns true). During the Box2D world step (b2Island::Solve), the engine steps over static any objects and never hides the e_awakeFlag bit, even though the static objects never move.
- Shubi
- - Joined 9 Dec, 2016
  - 99 topics • 481 posts
- 1
- 26 Aug, 2019
- Quote
OK... Is there a work around for this as it affects performance. I mean whats the point of having put to sleep feature if it doesn't work on static objects...
- Colludium
- - Joined 26 Aug, 2013
  - 151 topics • 2,659 posts
- 1
- 26 Aug, 2019
- Quote
This is normal for Box2D and nothing to be concerned about. There is no work-around: it's part of Box2D...