In fresco painting, a drawing called a is transferred to the prepared surface prior to applying the pigment

In fresco painting, a drawing called a cartoon  is transferred to the prepared surface prior to applying the pigment

Explanation:

The purpose of the cartoon is to provide to the artist a previous sight about the surface, the lighting, the textures, the figure's density, and the main details of the future fresco. The cartoon is traditionally drawn in a piece of paper, using graphite, coak, chalk, and any other element that can create an outline of the drawing, or it's main features.