The invention relates to a three-dimensional reconstruction of at least one entity from data representative of the entity in the form of a plurality of sets, called sections (S
i ), of points (P
n ) sequenced in two dimensions representative of the entity, the plurality of sets being sequenced according to a third dimension representative of the entity, each of the points being cataloged according to a plurality of parameters, at least one part of which defines the point in one of the sections, characterised in that it comprises a determination of a polygonal line joining all the consecutive points of each of the curves and a triangulation of the strips between the polygonal lines, by at least one iterative advancing front of defined successive triangles (FT), from a segment (ST) connecting a polygonal line (LP
i ) to the following polygonal line (LP
i+1 ), forming a triangle with the point (Pn) of one of said two polygonal lines (LP
i , LP
i+1 ) which is the least furthest away from the polygonal line (LP
i+1 , LP
i ) to which it does not belong.