diff --git a/src/graphics/buffers.c b/src/graphics/buffers.c
index 48a3eb8..a31c830 100644
--- a/src/graphics/buffers.c
+++ b/src/graphics/buffers.c
@@ -442,7 +442,7 @@ if (1) printf("space_XYZ (%d*%d*%d)  step_xyz (%d,%d,%d)  coeff = %d = step_z *
         for (int j = 0; j < space_Y; j++)
             for (int k = 0; k < space_Z; k++){
                 rayon = radius(i, j, k, space_X, space_Y, space_Z);
-                if (rayon < limit_sup && rayon >= limit_inf){
+                if (rayon < limit_sup && rayon > limit_inf){
 
 u = (i - space_X / 2) * step_x + (j - space_Y / 2) * step_y + (k - space_Z / 2) * step_z;
 v = i * step_x + j * step_y + k * step_z;