Hi,
On Tuesday 26 June 2007 12:01, Benjamin Cabut wrote:
> Hello,
>
> I use the chessboard of the sample "osganimate".
> And I would like to add a Callback that get some value in a LUA script
> to change the color of the Chessboard.
>
> I get the geometry from the Drawable, then the colorArray.
> I change the color ( (*colors)[0].set())
> But the color of the ChessBoard is not affected...
>
> I tried in a UpdateCallBack and in a DrawableUpdateCallback, with same
> effect, and I noticed that I only go once in the DrawableUpdateCallBack
>
> Seems the color is memorized and I can't say the system it changed...
>
> Could you explain me why? and how should I do?
Dirty the display list on update or switch it of completely.
You get there only once when the display list is generated.
What to do depends on how often the updates really happen. If you really have
to update that color on every frame it is better to disable display lists.
If you nedd to update only every now and then, it might be worth to generate
the display list and use it for some frames.
The functions
osg::Drawable::dirtyDisplayList()
and
osg::Drawable::setUseDisplayList(bool)
are your friend.
Greetings
Mathias
--
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