diff --git a/main.cpp b/main.cpp
index a0f041e..6ff1a61 100644
--- a/main.cpp
+++ b/main.cpp
@@ -41,7 +41,7 @@ std::vector<sector> sectors;
 int current_sector = 38;
 int current_sector2 = 38;
 
-vec2 position = { 1056.0f, -3616.0f };
+vec2 position = { 1056.0f, 3616.0f };
 //vec2 position = {975.0f, -3525.0f};
 float orientation = 90.0f; //270.0f;
 //float orientation = 180.0f;
@@ -219,7 +219,7 @@ void loadMap(const char* name)
     int16_t *vertices = (int16_t *)wad::load(name, "VERTEXES", &size);
     const int num_vertices = size/4;
     for (int i=0;i<num_vertices;++i)
-        verts.emplace_back(vec2{float(vertices[i*2]), float(vertices[i*2+1])});
+        verts.emplace_back(vec2{float(vertices[i*2]), -float(vertices[i*2+1])});
     free(vertices);
 
     uint8_t *sectors_lump = wad::load(name, "SECTORS", &size);
@@ -245,7 +245,7 @@ void loadMap(const char* name)
 
     uint8_t *linedefs_lump = wad::load(name, "LINEDEFS", &size);
     uint16_t *l = (uint16_t *)linedefs_lump;
-    size /= 28;
+    size /= 14;
     for (int i=0; i<size; ++i) {
         const int16_t v1 = *(l++);
         const int16_t v2 = *(l++);
@@ -257,7 +257,7 @@ void loadMap(const char* name)
 
         if (ld1 != -1) {
             wall w;
-            w.v1 = v2; w.v2 = v1;
+            w.v1 = v1; w.v2 = v2;
             w.portal = portal ? arr[ld2].sector : -1;
             char txt[9]; txt[8]=0;
             for (int i=0;i<8;++i) txt[i] = toupper(arr[ld1].middle_texture[i]);
@@ -270,7 +270,7 @@ void loadMap(const char* name)
         }
         if (ld2 != -1) {
             wall w;
-            w.v1 = v1; w.v2 = v2;
+            w.v1 = v2; w.v2 = v1;
             w.portal = portal ? arr[ld1].sector : -1;
             char txt[9]; txt[8]=0;
             for (int i=0;i<8;++i) txt[i] = toupper(arr[ld2].middle_texture[i]);
@@ -407,6 +407,7 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
     {
         //const int tex_height = gif->h; //64;
         const float sector_height = s.ceiling_height - s.floor_height;
+        if (sector_height == 0) return;
 
         const int width = w->surf ? w->surf->w : w->upper_surf ? w->upper_surf->w : w->lower_surf ? w->lower_surf->w : 64;
         draw::map::putp(result.x, result.y, 6);
@@ -731,7 +732,7 @@ int main(int argc, char *argv[])
         {
             //if (sec==current_sector2)
             for (auto &w : s.walls) {
-                if (dot(normal, w.normal) >= 0) continue;
+                //if (dot(normal, w.normal) >= 0) continue;
                 draw::map::line(verts[w.v1].x, verts[w.v1].y, verts[w.v2].x, verts[w.v2].y, sec==current_sector?20:4, position.x, position.y);
                 vec2 nx {(verts[w.v2].x+verts[w.v1].x)/2, (verts[w.v2].y+verts[w.v1].y)/2};
                 draw::map::line(nx.x, nx.y, nx.x+w.normal.x*20, nx.y+w.normal.y*20, sec==current_sector?22:3, position.x, position.y);