从网格使用凸面碰撞体。
这意味着如果将此值设置为 true，则网格碰撞体不会具有孔洞或入口。 凸面网格可以与其他凸面碰撞体和非凸面网格碰撞。 因而，对于刚体，原始碰撞体提供的细节不足 ，更适合使用凸面网格碰撞体。\ 注意：物理引擎需要凸面网格才能具有非零体积。标记为凸面的平整网格（如四边形或平面）会由物理引擎修改为具有厚度（因而具有体积），以满足此要求。生成的网格的厚度与其大小成比例，最多可以是网格平面中最长尺寸的 0.05。
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