User's interaction with Direct3D?

[Cvele]

I got a panel on my main form. Direct3d is rendering on that panel. I want to move (simple translatory movement) a camera by X and Y axises using mouse. Problem is I dunno a ratio between 1 pixel size and D3D unit size.

Please help, only with some theory, not code.
Thanx!

[Cvele]

Ok, I could use any kind of help, including code, please :wave:

[Cvele]

Even a random guess would do, if nothing better is possible?

[Cvele]

I forgot to say that speed of camera should increase proportionally to camera's Z value (height, zoom)!

Maybe I should make some Vector3 based on camera location and screen position of cursor * camera height i.e. zoom??? And maybe some constant should be added to the mixture?

Somebody?