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> ## D

> detectability
>   The points of images or the surfaces of geometries are either detectable or not. If they are detectable, they fire an event (a hit detection event) whenever the mouse passes over a point or surface. The DAImage.Undetectable function (or Java ImageBvr.undetectable method) creates a copy of an existing image that is undetectable.
> directional light
>   Light in which rays arrive in the scene parallel to each other. This light mimics the light from a very distant source, such as the sun. In DirectAnimation, directional light is available as DAGeometry.DirectionalLight (or Java GeometryBvr.directionalLight).

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