Unity Issue Tracker - Physics.OverlapCapsule doesn't detect Terrain Collider when Terrain Heightmap Resolution is 513x513 (or lower)

Fixed in 2022.1.X

Votes

1

Found in

2019.3.0f5

2019.4.4f1

2020.1.0a19

2020.2

Issue ID

1263649

Regression

Yes

Physics.OverlapCapsule doesn't detect Terrain Collider when Terrain Heightmap Resolution is 513x513 (or lower)

Physics

-

Jul 16, 2020

To reproduce:
1. Open attached project ("case_1263649.zip")
2. Enter Play mode
3. In the Game view window click "Check Collisions" button
4. Observe the results

Expected result: "Detected 1 collisions" is printed in the Game view
Actual result: "Detected 0 collisions" is printed in the Game view

Reproducible in: 2019.3.0f5, 2019.4.5f1, 2020.1.0a19, 2020.1.0f1, 2020.2.0a18
Not reproducible in: 2018.4.25f1, 2019.3.0f4, 2020.1.0a1, 2020.1.0a18

Note: Collisions are being detected in some cases (can be observed by clicking "Set Positions for 1 collision" button before step 3)

Resolution Note (fix version 2022.1):

Fixed in: 2022.1.0a2

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Comments (3)

kobyfr

Oct 28, 2022 15:25

well, that did not get solved... and anyway, my heightmap resolution is 4096x4096.
terrain collision with small objects still goes undetected, in 2022.1.21f1.
kobyfr

Oct 28, 2022 15:02

thanks for fixing this... I did not understand why after applying a height map to my terrain, it no longer generates collision events for small objects.
LeonardoMello

Feb 19, 2021 00:17

I noticed this same flaw in a collision test on my Player, where the OverlapCapsule is used to check if it is on the ground. The amount of collisions hovers from 0 to 1 as it moves, causing the player's jumping system to fail. This failure stops when the player is on top of objects other than the terrain. I increased the heightmap resolution to 1025 x 1025, and the failure ceased. In fact, there is still an oscillation, but it is almost imperceptible.

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