3D space: from photogrammetry to lasergrammetry

In heritage, and especially rock art, 3D digital recording and reproduction methods are today an attractive resource for conservation assistance as much as a scientific medium. The recent technical progresses linked to advances in information technology made it possible to propose to heritage practitioners attractive reproductions that however often conceal all questioning. Considering the two techniques that are mostly used toady, photogrammetry and lasergrammetry, it is necessary to assess their ability to render accurate measurements and to virtually reproduce the reality. The issues specificities and the knowledge of the processes make it possible to create products that are efficient, adapted to the specific cases, and that go far beyond the mere synthesis of digital images.