OpenGL View

Dmitri Litvintsev (litvinse@cdfsga.fnal.gov)
Mon, 26 Jul 1999 15:58:08 -0500 (CDT)


Hi Rooters,

Suppose I run supplied macro 'shapes.C'. In OpenGL view:

- typing 'j' which should result in drawing objects farther away,
actually results in their gradual disappearance (I'd say it
looks like shapes are being immersed in some opaque liquid,
like milk in this case, since the background is white)

- typing 'k' gradually restores original view but at certain
point objects do not move any closer, while I wanted to go
between or inside them.

It looks like the view is restricted by some boundaries which are
probably (guess) in the case of 'shapes.C' are defined by the
dimensions of the 'node1' which contains all the other nodes.

Here is the question, if it is possile at all to move shapes
so that the viewer can see them from the inside? May be someone
has workaround?

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.

People use ROOT as an EventDispaly tool rather efficiently.
OpenGL allows to get views of 'stunning beauty', to add some
functionality to this beauty I think moving 'inside' detector
and have the ability to look at tracks/hits through a bulk
of the detector are the options which everyone would certainly
appreciate.

regards,
Dmitri Litvintsev

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