diff --git a/main.cpp b/main.cpp
index 1d7e642..5507a82 100644
--- a/main.cpp
+++ b/main.cpp
@@ -172,14 +172,14 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
         float dpix = 64/wall_height;
         float cpix = 0;
         float wall_start = 120-(wall_height/64)*(64-height);
-        if (wall_start<0) {
-            cpix = -wall_start*dpix;
-            wall_height += wall_start;
-            wall_start=0;
+        if (wall_start<start) {
+            cpix = (start-wall_start)*dpix;
+            wall_height -= (start-wall_start);
+            wall_start=start;
         }
 
         // Pinta el sostre
-        for (int y=0; y<wall_start-1; y++) {
+        for (int y=start; y<wall_start-1; y++) {
             float straight_dist = (277 * (64-height)) / (y - (240 >> 1));
             float actual_dist = straight_dist / SDL_cosf(a_inc*DEG_TO_RAD);
             int tx = abs(int(actual_dist * SDL_cosf(angle*DEG_TO_RAD) - position.x)) % 64;
@@ -189,14 +189,14 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
 
         // Pinta la pared
         for (int i=0; i<wall_height; ++i) {
-            if (i>=240) break;
+            if (wall_start+i>=end) break;
             putp(screen_column, wall_start+i, gif[(int(v)%64)+int(cpix)*64]);
             cpix += dpix;
         }
 
         // Pinta el piso
         int paint_end = wall_start+wall_height-1;
-        for (int y=paint_end+1; y<240-1; y++) {
+        for (int y=paint_end+1; y<end-1; y++) {
             float straight_dist = (277 * height) / (y - (240 >> 1));
             float actual_dist = straight_dist / SDL_cosf(a_inc*DEG_TO_RAD);
             int tx = abs(int(actual_dist * SDL_cosf(angle*DEG_TO_RAD) + position.x)) % 64;
@@ -287,7 +287,7 @@ int main(int argc, char *argv[])
             infi.x = position.x + SDL_cosf(angle*DEG_TO_RAD)*40000;
             infi.y = position.y + SDL_sinf(angle*DEG_TO_RAD)*40000;
             
-            drawColumn(s, screen_column, 0, 240, a_inc, infi);
+            drawColumn(s, screen_column, 10, 220, a_inc, infi);
             /*
             vec2 result, tmp_result;
             wall *w = nullptr;