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Fixed in 5.1.4



Found in


Issue ID




Method WheelCollider.GetGroundHit and terrain changes causes unity crash



Sometimes method WheelCollider.GetGroundHit crashes unity if terrain height is changed, I'm still not sure for real cause.

1. Play scene "terrainbug".
2. Driver anywhere you like :D, after 15 second script "TerrainDeform" (attached on car) will begin spawn holes in terrain with 1 second interval.
3. Unity crash times can variate from 2 second to few minutes, but eventually it crashes.

Reproduced: 5.0.0b2, 5.0.0f4, 5.0.0b15

The fix available in 5.1.3p1 a patch release. Officially will be available in 5.1.4f1;

Comments (11)

  1. hazer-drum

    Sep 11, 2015 18:54

    I have the same problem in 5.1.3f1 with error "m_InstanceID != 0".

  2. leevermeulen

    Aug 30, 2015 21:09

    I am still getting this crash in Unity 5.1.3p1

    001E3BFA (Maximum) ScriptingManager::RebuildClassIDToScriptingClass
    001E3C81 (Maximum) Scripting::ScriptingWrapperFor
    003FC833 (Maximum) RegisterModule_Physics
    04346A27 (Mono JIT Code) (wrapper managed-to-native) UnityEngine.WheelCollider:GetGroundHit (UnityEngine.WheelHit&)
    0437F5F9 (Mono JIT Code) RTCTankController:SmokeInstantiateRate ()
    0437DE97 (Mono JIT Code) RTCTankController:FixedUpdate ()
    0429E571 (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)

    Happening when my tank vehicle goes over destructible game objects and they are removed

  3. .koval

    Jul 18, 2015 21:18

    "A fix will come later in 5.x."

    The same for Unity v5.1.2f1 :(

  4. NeilC_VP

    Jul 15, 2015 10:24

    We've just had this issue too on 5.1.1p2. GetGroundHit is being called from FixedUpdate.

    013E3E3A (Champ test) ScriptingManager::RebuildClassIDToScriptingClass
    013E3EC1 (Champ test) Scripting::ScriptingWrapperFor
    015FBC53 (Champ test) RegisterModule_Physics
    04CCF12F (Mono JIT Code) (wrapper managed-to-native) UnityEngine.WheelCollider:GetGroundHit (UnityEngine.WheelHit&)

  5. glitchers

    Jul 06, 2015 08:46

    I have the same issue as De-Panther & Phong.

  6. Phong

    Jun 15, 2015 18:45

    Same problem with CubeCollider as described by DE-PANTHER.

  7. De-Panther

    Jun 06, 2015 22:32

    Also happen with box collider or any other collider that destroyed while the wheelcollider touch it.

    Simple example:
    Use Edy's Vehicle Physics,
    Take a car and put it above cube,
    Run the game and destroy the cube while the car is on the cube.
    Unity crash!

  8. dburden1

    Apr 17, 2015 16:44

    I can confirm that we have this crash as well on 5.0.1p1, and it doesn't always crash when a WheelCollider is even touching the terrain collision. Terrain modification is a pretty crucial part of our game's back-end. Is there any ETA on a fix for this? Also, would modifying terrain heights in FixedUpdate vs Update be an effective workaround for this issue?

  9. yant

    Apr 14, 2015 13:57

    Don't change terrain from within Update(). A better way to do that would be to have it within FixedUpdate(). A fix will come later in 5.x.

  10. protopod

    Apr 07, 2015 16:05

    Yep, the same thing happens to me. The vehicle just drives through the raised terrain like it's not even there, without falling through it, then Unity crashes.

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