title: Calculate raycast with specific PxRigidStatic object
body: <p>I've a <code>PxRigidStatic</code> object loaded in PhysX.</p>
  
  <p>I want to calculate the intersection point between this object and a ray.</p>
  
  <p>In the documentation I've found the <a href="http://docs.nvidia.com/gameworks/content/gameworkslibrary/physx/guide/Manual/SceneQueries.html#basic-queries" rel="nofollow noreferrer">QxScene::raycast</a> method but it works with every object loaded into the scene, so it hit also other objects (I want to calculate the height of a mesh representing a terrain but when I execute the raycast I obtain intersection with players that are in the same position).</p>
  
  <p>Is it possible to set the query only for a specific object?</p>