Hi Enrico,
Enrico Borrione wrote:
> Hi openSG users,
> using my cave application I run into a small, yet unpleasant, problem.
>
> I have 3 servers, which use 3 separate viewports.
> I create the viewports passing them the size, so they occupy one third of
> the multi display window each:
>
> beginEditCP(mainShVprt);
> {
> ...stuff...
> mainShVprt->setSize(left,0.0,right,1.0);
> ...stuff...
> }
> endEditCP(mainShVprt);
>
> Where left and right for the three viewports are:
>
> Left Right
> Server 0 0.0 1/NServers
> Server 1 1/NServers 1/NServers * 2
> Server 2 1/NServers * 2 1.0
this is probably something like 1.0f/NServers, so that you get floating
point division ?
> The servers work correctly, except that the first and the last column of
> pixels of every Server Window
> display just a dirty buffer.
>
> Am I doing something wrong?
no, this is how things should work, i.e. you should get viewports that
are right next to each other.
However in Viewport::getPixelLeft()/getPixelRight() the values are
computed like this:
return Int32(getParent()->getWidth() * getLeft());
return Int32(getParent()->getWidth() * getRight() - 1);
so I'm wondering if this is a rounding problem, i.e. if the product
above produces something 240.999 and the conversion to Int32 just chops
off the .999 part, essentially giving you a 1 off error ?
What is the width/height of the window you are using ? What values do
you get from Viewport::getPixelLeft()/getPixelRight() for each viewport?
regards,
Carsten
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