Among all the existing realistic lighting methods, the radiosity method is the only one that gives precisely an
analytic solution of diffuse light exchanges. The gradient of this solution have been studied but not often used in
a context of pure rendering. We present in this article a method to render a surface using the radiosity contour
levels. First, we define a differential formulation of the radiosity equation which leads us to a new expression of
the gradient of radiosity. We deduce from this general equation a simpler equation of this gradient in the case of
a planar surface lighted by a light source reduced to a point. Then we present our method to render planar
surfaces using a radial mesh that follows the contour levels of the radiosity. This method is shown to improve
the quality of the rendering and decrease the number of vertices used for rendering