heightmapMaximumLOD does not refresh the terrain collider?

Hi,

To increase performance our game sets the heightmapMaximumLOD to 1 when setting to fastest quality settings. Unfortunately it seems that the terrain collider is unchanged an still using the high terrain LOD. This results in our character walking through the terrain.

I tried a code like this:

 int aWidth = Terrain.activeTerrain.terrainData.heightmapWidth;
 int aHeight = Terrain.activeTerrain.terrainData.heightmapHeight;
 float[,] aHeights = Terrain.activeTerrain.terrainData.GetHeights(0,0,aWidth,aHeight);
 Terrain.activeTerrain.terrainData.SetHeights(0,0,aHeights);

because i red in the documentation that SetHeights will automatically recalculate the Terrain collider but without success.. Any ideas out there?

Thnx a lot..