[Clusterviz-devel] Re: Karsten's panning proposal

[Janne G. <gr...@mo...>]

> Hey Karsten and the rest of the world,
>
> I have noticed a few issues with your proposal.
>
> * Generally we want a simpler panning mechanism than what you thought
> of. The idea was just to pan in the plane perpendicular to the
> viewing direction. When I looked at your coded it occurred to me that
> this really should not be too difficult to implement. Basically it
> should suffice to (push another matrix, (maybe load identity - but
> probably not,) and then) do the translation in x-y-direction as
> dictated by the user's mouse movements (and pop matrix afterwards).
> One point that I did not think through entirely is when to do this
> manipulation - at the beginning or at the end of the matrix stack?

It is not that simple. I tried such approaches and the genral problem is 
that they will not work together with rotations. You have to do a 
translation in the viewing plane and not in the x-y-plane.
We want a x-y movement of the point of view. Since the camera has always 
coordinates 0,0,0 we must convert this camera translation into 
translation of the world.

> One complication with the Patches-service at SF is at the moment that
> it is not clear to exactly which revision a patch might apply as we
> don't make use of the SF-CVS in favor of our own private SVN-server
> to which you unfortunately don't have access (and it is not clear
> whether I can get you access there - though I will check). I need to
> change this situation. I will try and replicate the history of the
> SVN-server we are currently using into my own private one where it
> would be easy to grant you or other developers the necessary access
> rights until we make the transition to the hopefully soon fully
> functional SVN-service at SF.

Different Solution. We can add at the original svn server accounts just 
for the repository. I will add an acount for Karsten this afternoon and 
mail him instructions.

ciao Janne