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When false, the explicitly set mass is used for the rigid-body mass. When true, the mass is automatically calculated from all attached Collider2D as a product of their [[Collider2D.density]] and area.
When true, inside the Unity editor, the [[Collider2D.density]] property will appear on any attached Collider2D and the mass property will become read-only.
When false, the mass property can be written to and the [[Collider2D.density]] property is not shown.
See Also: mass, ::Collider2D.density.