Hi Alexandre,
If you are dynamically updating geometry you should disable display lists via:
geometry->setUseDispayList(false);
Set this up on creation of your geometry.
Robert.
On Fri, Jul 11, 2008 at 8:49 PM, alexandre amyot murray
<[EMAIL PROTECTED]> wrote:
> Hi,
>
> I have a plane built with 60X60 vertex and I constantly update the alpha
> channel of these vertex to create a specific effect for my application. When
> I launch the application, everything runs fine for a while, but comes a time
> where everything starts to lag.
>
> Do you know why such a thing happens ?
>
> I use this code to update alpha channel :
>
> // Slowly affect the alpha
> osg::Vec4Array* colorArray =
> ((osg::Vec4Array*)myGeometry_->getColorArray());
> for( unsigned int i=0; i<colorArray->size(); i++ )
> {
> if( (colorArray->at( i )).a() < 1.0 )
> {
> double alpha = (colorArray->at( i )).a() + alphaIncrement_;
> if( alpha > 1.0 )
> alpha = 1.0;
>
> if( alpha >= 0.0 )
> (colorArray->at( i ))[3] = alpha;
> }
> }
>
> myGeometry_->dirtyDisplayList();
>
> thanks
>
> Alexandre
>
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>
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