diff --git a/sample/PGEX_SMX.h b/sample/PGEX_SMX.h
index fa92b13..635bab8 100644
--- a/sample/PGEX_SMX.h
+++ b/sample/PGEX_SMX.h
@@ -40,7 +40,10 @@ public:
                 for(int y=i/3*7;y<i/3*7+7;y++){
                     int col=0;
                     for(int x=i%3*4;x<i%3*4+4;x++){
-                        if(row%2&&col%4==0)continue;
+                        if(row%2==1&&col%4==0){
+                            col++;
+                            continue;
+                        }
                         Pixel p(pge->GetDrawTarget()->GetPixel(x,y));
                         lightData.append(1,p.r);
                         lightData.append(1,p.g);