Search Issue Tracker
By Design
Votes
1
Found in
2018.4
2019.3
2019.3.9f1
2020.1
2020.2
Issue ID
1237624
Regression
No
OnCollisionEnter is occasionally triggered on Start by a non-contacting Collider, using Continuous Speculative detection
How to reproduce:
1. Open user-submitted project (TestRoll2.zip)
2. Open the SampleScene
3. Observe the Console window, Enter and Exit Play Mode
Expected result: the tilted plane never collides with the spawned Sphere on Start
Actual result: the tilted plane occasionally collides with the spawned Sphere on Start
Reproducible with: 2018.4.21f1, 2019.3.9f1, 2020.1.0b5, 2020.1.0a7
Could not test with: 2017.4.39f1(Continuous Speculative detection unavailable)
Notes:
May take several attempts to reproduce
Could only reproduce with Sphere's CollisionDetectionMode.ContinuousSpeculative
Add comment
All about bugs
View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.
Latest issues
- Errors “Render Graph Execution error” and "KeyNotFoundException" are thrown and Scene/Game views are not rendered when RenderGraphBuilder has AsyncCompute enabled
- Separation Line is used at the bottom of Prefab dropdown options when there is nothing to separate
- Color Picker Window Shows UI Artifact on Ubuntu Until Mouse Movement
- WebGPU Build fails when the Inference Engine package is installed
- The search field has an additional icon that has no functionality
Resolution Note:
Speculative (=predictive) collision detection can detect false positives because of the nature of how it works -- inflating the contact offset and using normal contact generation to discover contacts.