diff --git a/sample/PGEX_SMX.h b/sample/PGEX_SMX.h
index dec140e..6e54720 100644
--- a/sample/PGEX_SMX.h
+++ b/sample/PGEX_SMX.h
@@ -50,9 +50,9 @@ public:
                         lightData.append(1,p.b);
                         col++;
                     }
-                    row++;
+                    row+=2;
                 }   
-                row=0;
+                row=1;
                 for(int y=i/3*7+1;y<i/3*7+7;y+=2){
                     int col=0;
                     for(int x=i%3*4;x<i%3*4+4;x++){
@@ -66,7 +66,7 @@ public:
                         lightData.append(1,p.b);
                         col++;
                     }
-                    row++;
+                    row+=2;
                 }   
             }
         }