标志eASSUME_NO_INITIAL_OVERLAP有什么影响？

Question

当我使用scene.sweep时，有时障碍点是有效的，但有时该点是零。我在API中阅读了一个提示：

\note   If a shape from the scene is already overlapping with the query shape in its starting position,
        the hit is returned unless eASSUME_NO_INITIAL_OVERLAP was specified.

当我添加标志eASSUME_NO_INITIAL_OVERLAP时，它总是返回块点位置。但是我也发现起始位置被忽略了。

pxHitFlags |= PxHitFlag::eASSUME_NO_INITIAL_OVERLAP;

该如何预防这种情况？