是否应根据附加碰撞体的 [[Collider2D.density]] 自动计算总刚体 mass?
如果为 false,则将显式设置的 mass 用作刚体的质量。如果为 true,则根据所有附加的 Collider2D(其 [[Collider2D.density]] 乘以面积)自动计算质量。
如果为 true,则在 Unity Editor 中,任何附加的 Collider2D 上都将显示 [[Collider2D.density]] 属性,并且 mass 属性变为只读状态。
如果为 false,则可以写入 mass 属性,并且不显示 [[Collider2D.density]] 属性。
另请参阅:mass、::Collider2D.density。
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