Turntable Camera

[nolankramer]

I'm curious if anyone here has implemented a Turntable camera controller. Camera controls are not exactly my expertise, and I've been trying to adapt the Trackball code, but with little luck. I started with trying to rewrite the rotate() function, which I think is the right place.

I haven't even approached Gimbal lock yet.

Any ideas/thoughts?

[robertosfield]

The vsg::Trackball isn't meant to be a general base class for camera manipulators so is likely ill suited to trying to co-opt into being something other than a trackball.

My recommendation would be to just start from scratch. Like vsg::Trackball you'll want to subclass from vsg::Visitor and override the event related methods to handle the keyboard and mouse events to control the view point, then if you want to have animation support implement this by override the Frame event.

[nolankramer]

Thanks for the quick reply Robert.

To be clear - I only adapted the vsg::Trackball code, I did not inherit from it.

Mechanically, what I did was copy the entire vsg::Trackball code and simply rename the class to Turntable, then tried to change the rotate() function.

Basically using the vsg::Trackball class as an example/template to get started.

I wonder if this is a good place to start in your opinion. The vsg::Trackball code has a lot of the infrastructure already in-place, and much of the guts could be replaced to implement a Turntable controller.