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public RayHitTestResult? GetClosestHitObject( Ray ray, HitTestOptions? customHitTestOptions = null )
GetClosestHitObject method executes a hit testing on the SceneNodes that are shown by this SceneView and returns a RayHitTestResult object with the closest triangle hit. When no triangle is hit, null is returned.
This method takes a Ray as a parameter. The ray can be created by the GetRayFromCamera(Single, Single, Boolean) or GetRayFromNearPlane(Single, Single, Boolean) methods. You can also use the GetClosestHitObject(Single, Single, Boolean, HitTestOptions) method that takes mouse coordinates instead of a Ray.
To control advanced hit-testing options set the customHitTestOptions parameter (HitTestOptions) or change the Scene.DefaultHitTestOptions that is used when customHitTestOptions parameter is not set (null by default).
To get all hit results (ant not just the closest hit), use the GetAllHitObjects(Single, Single, Boolean, HitTestOptions) or GetAllHitObjects(Ray, HitTestOptions) methods.