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# libQGLViewer examples

»» Introduction
»» Basic examples
»» Pedagogical examples
»» More complex examples

## Introduction

Many pedagogical examples illustrate some of the functionalities of the viewer and are provided for understanding and cut and paste. They were not designed to be impressive, but to demonstrate what can be achieved with few lines of code.

One should first try the basic examples listed below and read the introduction page to understand the philosophy of the library. See also the compilation with libQGLViewer page to learn how to create your first program.

## Basic examples

simpleViewer The simplest application example: 20 lines of code and yet all the power ! | manipulatedFrame A `ManipulatedFrame` can be moved with the mouse in the scene.
select Selection of scene objects using `select()` and an GL_SELECT render mode. | keyboardAndMouse Shows how to customize your keyboard and mouse bindings.

## Pedagogical examples

animation The `animate()` function illustrated by a water particle simulation. | callback Using the Qt signal-slot mechanism to connect a QGLViewer to your scene. | cameraLight This example shows how to position a GL_LIGHT on the camera.
clippingPlane A clipping plane is manipulated using a ManipulatedFrame | constrainedCamera Constraints applied on the Camera Frame to limit its translation and/or rotation. | constrainedFrame Constraints can limit the translation and/or rotation of a (Manipulated)Frame.
drawLight The `drawLight()` function is a light debugging tool. | fastDraw The `fastDraw()` function enables interactivity even with large scenes. | frameTransform Coordinate transformation between different Frames.
frustumCulling Frustum culling using `getFrustumPlanesCoefficients`. | interface Adding a graphical user interface around a `QGLViewer`. | keyFrames The `KeyFrameInterpolator` test example.
luxo A more complex example that combines `ManipulatedFrames`, selection and constraints. | mouseGrabber `MouseGrabber`s enable complex mouse interaction. | multiSelect Customized `select()` function that enables the selection of several objects.
multiView A multi-view application, with constrained camera displacements. | overpainting Mixing OpenGL (3D) and QPainter (2D) drawing in the same viewer. | screenCoordSystem A saucers control viewer that illustrates the screen coordinate system feature.
standardCamera A 'standard' Camera with fixed near and far planes. | stereoViewer Simply press `S` to toggle stereo display (if supported). |

## More complex examples

3dsViewer The LGPL lib3ds library is used to load and display a 3ds scene. | agora Implementation of the game of Agora. | anaglyph Displays a scene in pseudo-stereo using anaglyph.
backgroundImage Displays a background image in the viewer. | blobWar Implementation of the game of BlobWar. | cornerAxis Displays a world axis in the lower-left corner of the window.
dvonn Implementation of the game of Dvonn. | eventRecorder Records a scenario that can be replayed and converted into a movie. | quarto A simulation of the game of Quarto.
terrain A random fractal terrain with trees, animated water, sky and shadows. | textureViewer Loads an image file and texture maps a polygon with it. | thumbnail Displays an alternative 3D view in a corner thumbnail.

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