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2D JavaScript/TypeScript physics engine for cross-platform HTML5 game development

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# Interface: MassData MassData This holds the mass data computed for a shape. ## Properties ### center > **center**: [`Vec2Value`](/api/interfaces/Vec2Value) The position of the shape's centroid relative to the shape's origin. *** ### I > **I**: `number` The rotational inertia of the shape about the local origin. *** ### mass > **mass**: `number` The mass of the shape, usually in kilograms.