Re: OpenGL View

From: Dmitri Litvintsev (litvinse@cdfsga.fnal.gov)
Date: Tue Jul 27 1999 - 05:52:07 MEST


Thank you Valery, 


> > Next question - is it possible to introduce interactive
> > manipulation of the shape's transparency? (I understand that
> > OpenGL allows to do so).  Or at least change the view to
> > hardcoded 'predefined' transparent mode by pushing some button.
> 
>    ROOT doesn't provide any "Alpha"  color attrtibute that  "blending" feature
>    of OpenGL needs. Anyway this feature consumes a lot CPU been implemented.
>    ( Three years ago it was too expansive )
> 
>    You may try "w" / "r" / "c" / "t" commad (see above).
> 

Well I meant actually 'semitransparent' or 'foggy' the sort I saw in 
displays produced by 'OpenInventor'. 

   Wireframed and Hidden line modes aren't of much use, given the 
complexity of the detector geometry, since there are too many lines which 
obstruct the view. 
   
 Thank you for the explanation of the 'zooming' in OpenGL. I just got 
used to X3d way of doing it and was somewhat confused when tried OpenGL.
Now I see that 'zooming' (I assigned it to a button in my 'special' 
canvas) in the Pad, which contains a TView,  actually leads to the desired 
effect in OpenGL window. 


regards,
Dmitri



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