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# QGLViewer features

Most of the viewer's functionalities are illustrated by an example, that is referenced by the

## Main features

- A camera trackball to easily move the camera in the scene (explorer or walkthrough mode)
- Definition of a intuitive world coordinates system (the OpenGL modelView matrix made easy)
- Coordinate systems (and hence objects) can easily be moved with the mouse
- Hierarchical coordinate systems (frames), with functions to convert from a frame to any other
- KeyFrameInterpolator to animate those frames, and especially the camera
- Simple object selection using mouse
- Screenshot saving in different file formats (jpg, png, bmp...), including vectorial rendering (eps, ps, xfig)
- Complete and entirely customizable keyboard shortcuts and mouse behavior

## and also...

- Many simple examples illustrating the different functions
- A complete reference documentation
- Display of the frame rate, of a world axis, of a 2D grid and of camera paths, full screen display...
- Easy drawing of text directly in screen coordinate system (2D overlay) or in 3D
- Extendable displacement constraints that can be applied on frames
- Viewer state is saved and can be restored at each application start
- A simplified drawing function can be provided to guarantee interactivity, even with large scenes
- The possibility to mix 3D and 2D (with intuitive pixel coordinates) drawing
- Possible animation of the scene at a given frame rate
- Stereo display (provided that your hardware supports it)
- Robust implementation of the basic `Vec, Quaternion` and `Frame` classes
- Copy buffer to texture function
- Customizable help window

## Philosophy

Classical 3D viewer features are directly available, so that you can quickly start the development of a new application, focussing on what is drawn instead of how to make the computer draw it.

All these functions are very easy to use in your application code. Adding code to select scene objects and then manipulate them using the mouse can be done in 5 minutes.

See the different examples to get an more precise idea. Send an email if you think of a new feature.

Last modified on Sunday, February 28, 2010.