[sldev] How does the camera mechanism work

[Dave Parks]

In an internal maintenance branch, I just checked in a joystick driven 
flycam.  Basically, if you don't call gAgent.updateCamera, you can call 
some other function to update the camera position and rotation.

Tobias Lang wrote:
> Hi,
>
> I like to control the viewer camera (in mouse look mode) from an 
> external source, lets say an intertial tracker. I studied the code, 
> but I am still not sure how the whole camera system works.
> In  my understanding, the LLAgent (thats me) has a LLViewerCamera 
> which in the end has a LLCoordFrame. In the LLCoordFrame, the 
> orientation and translation is stored. So any change to the camera 
> must finally change this coordinateframe (?)
> But the difficult part is to find out where the transformations are 
> set...
>
> Looking at the code, I see methods like updateCamera() in LLAgent, 
> updateCameraLocation(..) in LLViewerCamera, setOriginAndLookAt() etc. 
> There are also many calls like setLookAt() or setLookDir(). (What is 
> the difference between these two?)
>
> Can someone describe briefly, how all the camera mechanism works, please?
>
> Thanks,
> Tobias
>
>
>
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