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Terrain thickness do not cause objects beneath the terrain to move above the terrain



How to reproduce:
1. Open attached project "Terrain Thickness" and scene "SampleScene"
2. In the Hierarchy window, select "Terrain" object
3. In the Inspector window, Terrain -> Terrain Settings(gear icon) -> Physics (On Terrain Data) -> make sure that thickness is 1000 (or any high value)
4. Enter Play mode
5. Observe Scene or Game view

Expected result: the Sphere is teleported on the terrain
Actual result: the Sphere is not teleported on the terrain and falls down

Reproducible with: 2018.3.14f1, 2019.1.0f2, 2019.2.0a13
Not reproducible with: 2017.4.26f1

  1. Resolution Note:

    Terrain thickness is available only with the legacy heightmap collision detection. The new unified heightmaps approach doesn't support it anymore, and is default in 2018.3.

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