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Forum: Visualization
Re: Question Moving the object in the screen (Pradip Datta)
Date: Jun 04, 02:24
From: Guy Barrand <Guy Barrand>

   Hi Pradip

  Just to comment a bit.

  What you would like to have is to equip something in the scene
(for exa a piece of detector) with "draggers". OpenGL does not have that. In fact
OpenGL does not even have the concept of secene and objects in a scene. It is only
a renderer.

  But some graphics toolkits on top of OpenGL provide draggers.
  Inventor (for exa by using the Coin3d implementation) has the SoDraggers
to do that. But right now in the G4/Inventor driver we have not used them to
move things around with the mouse. 
  I have other apps done with coin3d in which I start to use draggers (for exa
to define interactively some polygon cut area on a plot). In the LHCb/Panoramix
display, I have introduced them recently to move some "cut plane" to visualize the mag field.

  But today, we have not used them in G4, but more because we have not so
much ideas on where they may be usefull to use them !

  What is sure is that if we would like to have draggers in the OpenGL driver (and then
not the Inventor one) then it would need to dig a bit the web to find some light
package easily embeddable in G4 that provide draggers. (I think that glut have
that, but not sure)

 Else, that's right that the Inventor viewers are equipped with thumbwheels, but
they are used by default to change the camera position and not to drag things
around in the scene.

  Cheers

    Guy

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