Cap3D is an augmented reality mobile application which aims to enrich the visit of the discovery trail "FROM THE COAL TO THE SUN" in Cap’Découverte. An animation or a mini-game in augmented reality is to be discovered on the signs posted on the discovery path "FROM THE COAL TO THE SUN". This educational and cultural route is set up at the Cap’Découverte multi-leisure center in Tarn (France).