private Vector3 CastApproximateRayOnTerrain(Vector3 rayPos, Vector3 rayDir)
{
Terrain terr = Terrain.activeTerrain;
if (rayDir.y >= 0.0f)
{
return rayPos.Horz().Full3D(terr.SampleHeight(rayPos));
}
while (rayPos.y > terr.SampleHeight(rayPos))
{
rayPos += rayDir;
}
return rayPos - (rayDir * 0.5f);
}