Toms example is close to what I want (cheers for that Tom).
I'll have tinker with it tomorrow and see if I can make it work the way I want. Ideally I want it to feel like you have actually grabbed hold of an object/part of the landscape. So if I grab a tower then then I can drag it around the screen with the tower staying with the mouse pointer. Grabbing somewhere further in the distance will result in a different speed/scale of movement than grabbing something closer.
I'll have tinker with it tomorrow and see if I can make it work the way I want. Ideally I want it to feel like you have actually grabbed hold of an object/part of the landscape. So if I grab a tower then then I can drag it around the screen with the tower staying with the mouse pointer. Grabbing somewhere further in the distance will result in a different speed/scale of movement than grabbing something closer.